CN112914576A - Human body bioelectricity detection circuit, detection system and detection method - Google Patents
Human body bioelectricity detection circuit, detection system and detection methodDownload PDFInfo
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Abstract
Description
Technical Field
The invention relates to the technical field of bioelectricity detection, in particular to a human body bioelectricity detection circuit, a human body bioelectricity detection system and a human body bioelectricity detection method.
Background
During the life activity, the organs, tissues and cells of the living beings have the potential and polarity change, so that the bioelectricity is generated. It is a physical and chemical change in the course of life activity, is the manifestation of normal physiological activity, and is also a basic characteristic of living tissue. The bioelectrical activity in the organism can be detected by adding a detection probe on the external surface of the organism.
The wide and complicated electrical phenomena in the organism are the reflection of normal physiological activities, and under certain conditions, the bioelectricity is regular in a statistical sense: certain physiological processes correspond to certain electrical responses. Therefore, whether the physiological process is in a normal state or not can be deduced according to the bioelectricity change, such as detection of bioelectricity information of electrocardiogram, electroencephalogram, electromyogram and the like.
In 20 th century and 50 th era, the fact that the skin on the surface of the acupuncture point has low resistance and high potential was discovered in Japan. Further research shows that the resistance and conductivity of the channels and acupoints are biophysical indexes reflecting the objectivity of the meridian system. For example, the electrical impedance of the meridians of a healthy human body is bilaterally symmetrical, while the electrical impedance of the meridians on both sides of the patient is significantly unbalanced. Bilateral imbalance of meridian impedance, exterior-interior imbalance and visceral and meridian pathological changes have general correlation, and viscera and meridians involved in abnormal conduction (or resistance) may have specific correlation with disease transmission. (Liuli et al, observation of correlation between the change of body surface conductivity of twelve primary points of brain tumor patients and viscera and meridians, Chinese journal of basic medicine, 2009, 15(11) 857-once drug 860.)
The bioelectricity of the acupuncture point is mainly collected to measure the resistance at present, and has been proved by scientific experiments and clinic in the world and China for decades, and the pathological changes of the human body show abnormal resistance on the body surface, mainly obvious resistance reduction. In Germany and Japan, the former type of research is conducted, and the point of the decrease in resistance is called "good conducting point" in China. A method of searching for a corresponding diseased human body part by detecting a part where the resistance becomes low is also called a "good conduction method". Similar resistance measuring instruments have been in clinical use throughout the country after the last 70 th century, and a large number of documents and clinical analyses have been accumulated.
However, when the existing detection device detects the bioelectricity of the human body, the bioelectricity of the human body is obtained only in a mode of detecting the resistor, the detection mode is single, and the detailed condition of the bioelectricity of the human body cannot be accurately known.
Therefore, there is a need to provide a novel human body bioelectricity detection circuit, detection system and detection method to solve the above problems in the prior art.
Disclosure of Invention
The invention aims to provide a human body bioelectricity detection circuit, a human body bioelectricity detection system and a human body bioelectricity detection method, which can simultaneously complete multi-parameter bioelectricity detection of potential, resistance and capacitance of a human body.
To achieve the above object, the present invention provides a human body bioelectricity detecting circuit, comprising:
a constant current source module;
a constant voltage source module;
the detection module is connected with the output end of the constant-current source module through a first analog switch, and is electrically connected with the output end of the constant-current source module through a second analog switch;
the input end of the amplification conversion module and the output end of the detection module are electrically connected with the data processing module and the data processing module of the data processing module;
the input end of the processor is electrically connected with the output end of the amplification conversion module of the detection processing unit;
the input end of the detection module is connected with a detection probe, the detection probe is used for collecting human body bioelectricity data to obtain collected data, the detection probe is electrically connected with the detection module, and the detection circuit obtains at least one type of detection data through the collected data by adjusting the first analog switch and the second analog switch.
The invention has the beneficial effects that: the constant current source module and the constant voltage source module are respectively controlled to input the detection module through the first analog switch and the second analog switch, and the output voltage of the detection module is processed through the amplification conversion module, so that detection data are obtained, the human body electrical information can be obtained through processing the detection data subsequently, and multi-parameter detection of the human body electrical information is realized.
Further, the amplification conversion module comprises a first detection processing unit and a second detection processing unit, and an input end of the first detection processing unit is electrically connected with a first output end of the detection module; and the input end of the second detection processing unit is electrically connected with the second output end of the detection module.
Furthermore, the detection module comprises a first operational amplifier and a second operational amplifier, two input ends of the first operational amplifier are electrically connected through a resistor, one end of the resistor is electrically connected with the first analog switch and the second analog switch respectively, the other end of the resistor is connected with a first input end of the second operational amplifier, a first input end of the second operational amplifier is electrically connected with the detection probe, and a second input end of the second operational amplifier is grounded.
Further, the first detection processing unit includes a third operational amplifier and a first ADC unit, one input terminal of the third operational amplifier is electrically connected to the output terminal of the first operational amplifier, another input terminal of the third operational amplifier is grounded, an output terminal of the third operational amplifier is electrically connected to the input terminal of the first ADC unit, and an output terminal of the first ADC unit is electrically connected to the input terminal of the processor. The beneficial effects are that: the output voltage of the detection module is amplified and converted, so that the accuracy of data output detection is improved, and the data can be conveniently analyzed and processed subsequently.
Furthermore, the second detection processing unit comprises a fourth operational amplifier and a second ADC unit, a first input terminal of the fourth operational amplifier is electrically connected to an output terminal of the second operational amplifier, a second input terminal of the fourth operational amplifier is connected to a reference probe and grounded, an output terminal of the fourth operational amplifier is electrically connected to an input terminal of the second ADC unit, and an output terminal of the second ADC unit is electrically connected to an input terminal of the processor. The beneficial effects are that: the output voltage of the detection module is amplified and converted, so that the accuracy of data output detection is improved, and the data can be conveniently analyzed and processed subsequently.
Furthermore, the input end of the processor is electrically connected with a stress module, and the stress module is used for collecting pressure information of the detection probe acting on a human body. The beneficial effects are that: the stress module is used for collecting the pressure of the detection probe acting on the human body, and the detection probe is convenient to control the force when acting on the human body.
Further, the output end of the processor is electrically connected with the first analog switch and the second analog switch respectively. The beneficial effects are that: the processor is convenient to realize the switch control of the first analog switch and the second analog switch.
The invention also provides a human body bioelectricity detection system, which comprises the human body bioelectricity detection circuit and a data processing module, wherein the data processing module is in communication connection with the processor through a communication module, the processor transmits the detection data to the data processing module through the communication module, and the data processing module demodulates the detection data through an alternating current source demodulation method to obtain at least one human body bioelectricity information.
The system has the advantages that: the data processing module outputs a switch control instruction to the processor, so that the processor controls the first analog switch and the second analog switch to be switched on and off, detection data are output conveniently through the processor of the detection circuit, the data processing module can process different detection data through an alternating current source demodulation method to obtain different human body electricity information, and multi-parameter detection of human body bioelectricity is achieved rapidly.
Further, the detection data includes at least one of potential data, resistance data, and capacitance data, the data processing module processes the potential data by an ac source demodulation method to obtain body potential information, the data processing module processes the resistance data by an ac source demodulation method to obtain body resistance information, and the data processing module processes the capacitance data by an ac source demodulation method to obtain body capacitance information.
Further, the first analog switch and the second analog switch are in an off state, and the processor outputs the resistance data; the first analog switch is in an off state, the second analog switch is in an on state, and the processor outputs resistance data; the first analog switch is in a conducting state, the second analog switch is in a disconnecting state, and the processor outputs capacitance data.
Further, the data processing module outputs a switch control instruction to the processor through the communication module, so that the processor controls the on/off states of the first analog switch and the second analog switch.
Further, the communication module comprises at least one of a wired interface and a wireless interface, the wired interface comprises at least one of a standard serial port, a network cable interface, a USB interface and a Turbo C interface, and the wireless interface comprises at least one of a Bluetooth interface, a WIFI interface and an infrared interface.
Further, the data processing module includes any one of an upper computer system and an embedded system.
The invention also provides a human body bioelectricity detection method applied to the detection system, which comprises the following steps:
s1, contacting the detection probe with the human body to acquire the acquisition data of the bioelectricity of the human body;
s2, the data processing module outputs a switch control instruction to the processor through the communication module to control the first analog switch and the second analog switch, and then the acquired data is processed through the detection circuit to enable the processor to obtain detection data;
and S3, the processor transmits the detection data to the data processing module through the communication module, and the data processing module processes the detection data through an alternating current source demodulation method to obtain the human body electricity information.
The method has the beneficial effects that: the data processing module is used for controlling the opening and closing of the first analog switch and the second analog switch, so that the first detection processing unit and the second detection processing unit can detect the output voltage of the detection module to obtain different detection data of a human body, and the detection data are processed through the data processing module, so that different human body electrical information is obtained, and the multi-parameter detection of human body bioelectricity is realized.
Further, the specific process of step S2 includes:
when the first analog switch and the second analog switch are both switched off, the second detection processing unit detects the output voltage of the detection module to obtain potential detection data for detecting potential information;
when the first analog switch is turned off and the second analog switch is turned on, the first detection processing unit and the second detection processing unit detect the output voltage of the detection module to obtain resistance detection data for detecting the resistance information;
when the first analog switch is turned on and the second analog switch is turned off, the first detection processing unit and the second detection processing unit detect the output voltage of the detection module to obtain capacitance detection data for detecting the capacitance information.
Further, in step S3, the processor transmits the potential data, the resistance data, and the capacitance data to the data processing module through the communication module, respectively, and the data processing module processes the potential data by the ac source demodulation method to obtain the body potential information; the data processing module processes the resistance data through the alternating current source demodulation method to obtain human body resistance information; and the data processing module processes the capacitance data through the alternating current source demodulation method to obtain the human body capacitance information.
Drawings
FIG. 1 is a schematic circuit diagram of a detection circuit according to the present invention;
FIG. 2 is a schematic circuit diagram of the detection system of the present invention;
FIG. 3 is a schematic flow chart of the detection method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. As used herein, the word "comprising" and similar words are intended to mean that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items.
To solve the problems in the prior art, as shown in fig. 1, an embodiment of the present invention provides a human body bioelectricity detection circuit, including:
a constantcurrent source module 1;
a constantvoltage source module 2;
thedetection module 3 is electrically connected with the output end of the constant-current source module 2 through afirst analog switch 31, and thedetection module 3 is electrically connected with the output end of the constant-current source module 1 through asecond analog switch 32;
the input end of the amplification conversion module and the output end of the detection module are electrically connected with the data processing module, specifically, the amplification conversion module comprises a firstdetection processing unit 4 and a seconddetection processing unit 5, and the input end of the firstdetection processing unit 4 is electrically connected with the first output end of thedetection module 3; the input end of the seconddetection processing unit 5 is electrically connected with the second output end of thedetection module 3.
The two input ends of theprocessor 6 are respectively and electrically connected with the output end of the firstdetection processing unit 4 and the output end of the seconddetection processing unit 5;
wherein, detection module's input is connected withdetection probe 33,detection probe 33 is used for gathering human body bioelectricity data in order to obtain the data of gathering, justdetection probe 33 withdetection module 3 electricity is connected, through adjustingfirst analog switch 31 andsecond analog switch 32 so that detection circuit passes through data of gathering obtain at least one kind of detected data.
In the above circuit, the constantcurrent source module 1 and the constantvoltage source module 2 respectively provide stable current input and voltage input, and when the detection is performed specifically, thefirst analog switch 31 and thesecond analog switch 32 are controlled to be opened and closed to adjust the output voltage of thedetection module 3, so that the firstdetection processing unit 4 and the seconddetection processing unit 5 can detect the output voltage of thedetection module 3, and the subsequent output data of the firstdetection processing unit 4 and the seconddetection processing unit 5 can be processed to obtain different electrical information of a human body, thereby realizing the multi-parameter detection of the human body.
In some embodiments, thedetection module 3 includes a firstoperational amplifier 34 and a secondoperational amplifier 35, two input terminals of the firstoperational amplifier 34 are electrically connected through aresistor 36, one end of theresistor 36 is electrically connected to thefirst analog switch 31 and thesecond analog switch 32, the other end of theresistor 36 is connected to a first input terminal of the secondoperational amplifier 35, a first input terminal of the secondoperational amplifier 35 is electrically connected to thedetection probe 33, and a second input terminal of the secondoperational amplifier 35 is grounded.
Further, theresistor 36 is also used to construct a demodulation circuit (not shown) in thedetection module 3 for demodulation of the electrical parameter, and theresistor 36 is a high-precision resistor to meet the requirement of the precision of demodulation of the electrical parameter.
In thedetection module 3, the opening and closing of thefirst analog switch 31 and thesecond analog switch 32 are controlled, so that thedetection module 3 inputs the constantcurrent source module 1 or the constantvoltage source module 2, thedetection module 3 simultaneously detects the bioelectricity data of the human body as input through thedetection probe 33, and the bioelectricity data are respectively output to the firstdetection processing unit 4 and the seconddetection processing unit 5 through the comparison of the firstoperational amplifier 34 and the secondoperational amplifier 35, so that the output voltage of thedetection module 3 is processed by the firstdetection processing unit 4 and the seconddetection processing unit 5, and different human body parameter detection requirements are met.
Specifically, when thefirst analog switch 31 and thesecond analog switch 32 are turned off, since one input of thedetection module 3 is high impedance, the firstoperational amplifier 34 does not output at this time, the secondoperational amplifier 35 outputs the output of thedetection probe 33, the output voltage of the secondoperational amplifier 32 is detected by the seconddetection processing unit 5, and the human body potential information can be obtained after the output voltage is analyzed;
when thefirst analog switch 31 is turned off, thesecond analog switch 32 is turned on, and the input of thedetection module 3 is the constantcurrent source module 1, the firstdetection processing unit 4 and the seconddetection processing unit 5 respectively detect two output voltages of the firstoperational amplifier 34 and the secondoperational amplifier 35 of thedetection module 3, and after analyzing and processing the output voltages, the human body resistance information can be obtained;
In still other embodiments, the firstdetection processing unit 4 includes a thirdoperational amplifier 41 and afirst ADC unit 42, one input terminal of the thirdoperational amplifier 41 is electrically connected to the output terminal of the firstoperational amplifier 34, another input terminal of the thirdoperational amplifier 41 is grounded, an output terminal of the thirdoperational amplifier 41 is electrically connected to the input terminal of the first ADC unit, and an output terminal of thefirst ADC unit 42 is electrically connected to the input terminal of theprocessor 6.
The output voltage of the firstoperational amplifier 34 is amplified by the thirdoperational amplifier 41, and thefirst ADC unit 42 performs analog-to-digital conversion on the thirdoperational amplifier 41, so that theprocessor 6 receives more accurate digital signals.
In some embodiments, the seconddetection processing unit 5 includes a fourthoperational amplifier 51 and asecond ADC unit 52, a first input terminal of the fourthoperational amplifier 51 is electrically connected to the output terminal of the secondoperational amplifier 35, a second input terminal of the fourthoperational amplifier 51 is connected to areference probe 53 and grounded, an output terminal of the fourthoperational amplifier 51 is electrically connected to the input terminal of thesecond ADC unit 52, and an output terminal of thesecond ADC unit 52 is electrically connected to the input terminal of theprocessor 6.
The output voltage of the firstoperational amplifier 34 is amplified by the fourthoperational amplifier 51, and thesecond ADC unit 52 performs analog-to-digital conversion on the fourthoperational amplifier 51, so that theprocessor 6 receives more accurate digital signals.
Further, in the process of acquiring the bioelectrical data of the human body by using thedetection probe 33, since the part to be detected needs to be connected to the circuit, thedetection probe 33 and thereference probe 53 are respectively equivalent to the positive electrode and the negative electrode of the part to be detected, that is, thedetection probe 33 is equivalent to the positive electrode, and the human body data is acquired; thereference probe 53 is equivalent to a negative pole (or considered to be a ground) to achieve a "common ground" connection of the part of the human body to be detected to the entire detection circuit.
After the output signals of the firstdetection processing unit 4 and the seconddetection processing unit 5 are transmitted to theprocessor 6, theprocessor 6 may directly process the output signals to obtain the human body electrical data, or transmit the output signals to the outside for signal processing.
Preferably, the processor in this embodiment adopts a single chip microcomputer.
In some embodiments, the input end of theprocessor 6 is further electrically connected with astress module 7, thestress module 7 is used for collecting pressure information of thedetection probe 33, collecting pressure information of thedetection probe 33 acting on a human body through thestress module 7, and transmitting the pressure information to theprocessor 6, so that the whole detection circuit can acquire the pressure of thedetection probe 33 acting on the human body, an operator can conveniently grasp the force when using thedetection probe 33, and the human body is prevented from being damaged.
Preferably, in this embodiment, thestress module 7 is embodied as a pressure sensor, and the pressure sensor is installed at one end of thedetection probe 33 acting on the surface of the human body.
In some embodiments, the output of theprocessor 6 is further electrically connected to thefirst analog switch 31 and thesecond analog switch 32, respectively.
Theprocessor 6 controls thefirst analog switch 31 and thesecond analog switch 32 to open and close, so as to realize the detection process of the detection circuit on various bioelectrical parameters of the human body.
As shown in fig. 2, the present invention further provides a human body bioelectricity detection system, wherein the human body bioelectricity detection circuit further includes adata processing module 9, thedata processing module 9 is in communication connection with theprocessor 6 through acommunication module 8, theprocessor 6 transmits the detection data to thedata processing module 9 through thecommunication module 8, and thedata processing module 9 demodulates the detection data through an alternating current source demodulation method to obtain at least one type of human body bioelectricity information.
In the detection system, the alternating current source demodulation method is innovatively applied to multi-parameter demodulation of the human body bioelectricity data so as to realize multi-parameter detection of the human body bioelectricity data, optimization algorithm detection is carried out on the bioelectricity resistance value, quick and accurate measurement of the capacitance value is also realized, dependence on a high-speed data sampling rate is reduced, and compared with the detection system in the prior art, the detection system can effectively improve accuracy of the human body capacitance parameter.
In the detection system, thedata processing module 9 outputs a switch control instruction to theprocessor 6 through thecommunication module 8, so that theprocessor 6 controls thefirst analog switch 31 and thesecond analog switch 32 to be opened or closed, thereby realizing the detection process of different detection data of a human body.
In some embodiments, the detection data includes at least one of potential data, resistance data and capacitance data, thedata processing module 9 processes the potential data by an ac source demodulation method to obtain body potential information, thedata processing module 9 processes the resistance data by an ac source demodulation method to obtain body resistance information, and thedata processing module 9 processes the capacitance data by an ac source demodulation method to obtain body capacitance information.
Specifically, when thedata processing module 9 outputs a switch control instruction to turn off thefirst analog switch 31 and thesecond analog switch 32, the seconddetection processing unit 5 detects the output voltage of thedetection module 3, and then theprocessor 6 transmits the output signal of the seconddetection processing unit 5 to thedata processing module 9, that is, the potential data is demodulated by thedata processing module 9 to obtain the body potential information;
thedata processing module 9 outputs a switch control instruction to turn off thefirst analog switch 31 and turn on thesecond analog switch 32, the firstdetection processing unit 4 and the seconddetection processing unit 5 respectively detect the output voltage of thedetection module 3, and then theprocessor 6 transmits the output signals of the firstdetection processing unit 4 and the seconddetection processing unit 5 to thedata processing module 9, that is, resistance data, and thedata processing module 9 demodulates the output signals to obtain the human body resistance information;
when thedata processing module 9 outputs a switch control instruction to turn on thefirst analog switch 31 and turn off thesecond analog switch 32, the firstdetection processing unit 4 and the seconddetection processing unit 5 respectively detect the output voltage of thedetection module 3, and then theprocessor 6 transmits the output signals of the firstdetection processing unit 4 and the seconddetection processing unit 5 to thedata processing module 9, that is, capacitance data, and performs demodulation processing through thedata processing module 9 to acquire the capacitance information of the human body.
Furthermore, because thedata processing module 9 adopts the "ac source demodulation method" to implement the detection processing process of the human body capacitance information, and most of the conventional capacitance detection methods acquire capacitance values through the time of charging and discharging the capacitance, data sampling with higher time precision is required, that is, a high-speed data sampling rate, if the sampling rate is lower, the detection precision of the capacitance values will be deteriorated, compared with the conventional method, the ac source demodulation method adopted in the embodiment can greatly reduce the requirement on the sampling rate, and can implement higher-precision detection at the same sampling rate, thereby improving the detection speed and the detection precision of the human body capacitance information, and implementing the rapid and accurate detection process of the human body capacitance information.
Furthermore, when the output signals of the firstdetection processing unit 4 and the seconddetection processing unit 5 are processed, an alternating current source capacitance demodulation method is specifically adopted for processing, in the process of obtaining the human body resistance information, the output voltage, the related difference and the algorithm logic relationship between the output voltage and the precision reference resistance are adopted for demodulation and filtering, and the data transmission effectiveness is optimized, so that the human body resistance information is obtained; in the process of acquiring the capacitance information of the human body, the output voltage and the related difference are adopted, and the arithmetic logic relationship of the angular frequency, the precision reference resistance and the additional complex phase shift of the alternating current signal is adopted to demodulate and filter and optimize the data transmission effectiveness.
It should be noted that, in the process of processing the output signal by thedata processing module 9, an ac source capacitance demodulation method in the prior art is adopted, and the above demodulation, filtering processes and data transmission validity optimization processes are all processes in the prior art and are not described herein again.
In some embodiments, the communication module includes at least one of a wired interface and a wireless interface, the wired interface includes at least one of a standard serial port, a network cable interface, a USB interface, and a Turbo C interface, and the wireless interface includes at least one of a bluetooth interface, a WIFI interface, and an infrared interface.
Furthermore, the communication module also comprises a 4G interface or a 5G interface in the prior art, and can be directly communicated with a mobile phone to meet communication requirements under different conditions.
Different communication interfaces are selected according to different requirements, and the communication requirements under different occasions are met.
Preferably, in this embodiment, a bluetooth interface is specifically used for communication.
In some embodiments, the data processing module includes any one of a host computer system and an embedded system.
As shown in fig. 3, the present invention also provides a human body bioelectricity detecting method, comprising the steps of:
s1, contacting the detection probe with the human ear to acquire the acquired data of the human ear;
s2, the data processing module outputs a switch control instruction to the processor through the communication module to control the first analog switch and the second analog switch, and then the acquired data is processed through the detection circuit to enable the processor to obtain detection data;
and S3, the processor transmits the detection data to the data processing module through the communication module, and the data processing module processes the detection data through an alternating current source demodulation method to obtain the human body electricity information.
The first analog switch and the second analog switch are controlled by the data processing module to control the constant current source module and the constant voltage source module to input the detection module, so that the detection module obtains different output voltages, the processor obtains different detection data, and then the detection data are processed by the data processing module, so that different human body electrical information can be obtained, wherein the human body electrical information comprises potential information, resistance information and capacitance information.
Since the specific process of the detection method is the same as that of the detection system, the detailed description is omitted here.
In some embodiments, the specific process of step S2 includes:
when the first analog switch and the second analog switch are both switched off, the second detection processing unit detects the output voltage of the detection module and obtains potential data through the processor;
when the first analog switch is switched off and the second analog switch is switched on, the first detection processing unit and the second detection processing unit detect the output voltage of the detection module and obtain resistance data through the processor;
when the first analog switch is turned on and the second analog switch is turned off, the first detection processing unit and the second detection processing unit detect the output voltage of the detection module and obtain capacitance data through the processor.
In some embodiments, in step S3, the processor transmits the potential data, the resistance data and the capacitance data to the data processing module through the communication module, respectively, and the data processing module processes the potential data by the ac source demodulation method to obtain body potential information; the data processing module processes the resistance data through the alternating current source demodulation method to obtain human body resistance information; and the data processing module processes the capacitance data through the alternating current source demodulation method to obtain the human body capacitance information.
It should be noted that the detection circuit, the detection system and the detection method in the present application are applied to detection of human bioelectricity data, including but not limited to detection of human ear acupoints, and also applied to detection of bioelectricity of other parts of a human body, and are selected according to specific situations, and are not described herein again.
The invention has the beneficial effects that: the detection circuit is used for detecting the bioelectricity parameters of the human body, so that the bioelectricity data of various parameters can be detected simultaneously, the alternating current source capacitance demodulation method is applied to the detection process of the resistance and the capacitance of the bioelectricity, the optimization algorithm detection is carried out on the resistance information of the human body, meanwhile, the rapid and accurate measurement of the capacitance value is realized, and the dependence on the high-speed data sampling rate is reduced when the capacitance information of the human body is detected.
Although the embodiments of the present invention have been described in detail hereinabove, it is apparent to those skilled in the art that various modifications and variations can be made to these embodiments. However, it is to be understood that such modifications and variations are within the scope and spirit of the present invention as set forth in the following claims. Moreover, the invention as described herein is capable of other embodiments and of being practiced or of being carried out in various ways.
Claims (16)
1. A human body bioelectricity detection circuit, characterized by comprising:
a constant current source module;
a constant voltage source module;
the detection module is electrically connected with the output end of the constant-current source module through a first analog switch, and the detection module is electrically connected with the output end of the constant-current source module through a second analog switch;
the input end of the amplification conversion module is electrically connected with the output end of the detection module;
the input end of the processor is electrically connected with the output end of the amplification conversion module;
the input end of the detection module is connected with a detection probe, the detection probe is used for collecting human body bioelectricity data to obtain collected data, the detection probe is electrically connected with the detection module, and the detection circuit obtains at least one type of detection data through the collected data by adjusting the first analog switch and the second analog switch.
2. The human body bioelectricity detection circuit according to claim 1, wherein the amplification conversion module includes a first detection processing unit and a second detection processing unit, an input terminal of the first detection processing unit being electrically connected to a first output terminal of the detection module; and the input end of the second detection processing unit is electrically connected with the second output end of the detection module.
3. The human body bioelectricity detection circuit according to claim 2, wherein the detection module includes a first operational amplifier and a second operational amplifier, two input terminals of the first operational amplifier are electrically connected through a resistor, one end of the resistor is electrically connected to the first analog switch and the second analog switch, respectively, the other end of the resistor is connected to a first input terminal of the second operational amplifier, the first input terminal of the second operational amplifier is electrically connected to the detection probe, and a second input terminal of the second operational amplifier is grounded.
4. The human body bioelectricity detection circuit according to claim 2, wherein the first detection processing unit includes a third operational amplifier and a first ADC unit, one input terminal of the third operational amplifier is electrically connected to the output terminal of the first operational amplifier, the other input terminal of the third operational amplifier is grounded, an output terminal of the third operational amplifier is electrically connected to the input terminal of the first ADC unit, and an output terminal of the first ADC unit is electrically connected to the input terminal of the processor.
5. The human body bioelectricity detection circuit according to claim 2, wherein the second detection processing unit includes a fourth operational amplifier and a second ADC unit, a first input terminal of the fourth operational amplifier is electrically connected to an output terminal of the second operational amplifier, a second input terminal of the fourth operational amplifier is connected to a reference probe and grounded, an output terminal of the fourth operational amplifier is electrically connected to an input terminal of the second ADC unit, and an output terminal of the second ADC unit is electrically connected to an input terminal of the processor.
6. The human body bioelectricity detection circuit according to claim 1, wherein the input terminal of the processor is further electrically connected to a stress module, and the stress module is configured to collect pressure information of the detection probe when the detection probe is applied to the human body.
7. The human body bioelectricity detection circuit according to claim 1, wherein the output terminal of the processor is further electrically connected to the first analog switch and the second analog switch, respectively.
8. A human body bioelectric detection system comprising the human body bioelectric detection circuit according to any one of claims 1 to 7, and further comprising a data processing module, wherein the data processing module is communicatively connected to the processor via a communication module, the processor transmits the detection data to the data processing module via the communication module, and the data processing module demodulates the detection data by an ac source demodulation method to obtain at least one type of human body electric information.
9. The system according to claim 8, wherein the detection data includes at least one of potential data, resistance data and capacitance data, the data processing module processes the potential data by an ac source demodulation method to obtain body potential information, the data processing module processes the resistance data by an ac source demodulation method to obtain body resistance information, and the data processing module processes the capacitance data by an ac source demodulation method to obtain body capacitance information.
10. The human body bioelectricity detection system according to claim 9, wherein the first analog switch and the second analog switch are in an off state, the processor outputs the potential data; the first analog switch is in an off state, the second analog switch is in an on state, and the processor outputs resistance data; the first analog switch is in a conducting state, the second analog switch is in a disconnecting state, and the processor outputs capacitance data.
11. The system according to claim 10, wherein the data processing module outputs a switch control command to the processor through the communication module, so that the processor controls the on/off states of the first analog switch and the second analog switch.
12. The system according to claim 8, wherein the communication module comprises at least one of a wired interface and a wireless interface, the wired interface comprises at least one of a standard serial port, a network cable interface, a USB interface and a Turbo C interface, and the wireless interface comprises at least one of a Bluetooth interface, a WIFI interface and an infrared interface.
13. The human body bioelectricity detection system according to claim 8, wherein the data processing module includes any one of a host computer system and an embedded system.
14. A human body bioelectricity detecting method applied to the detecting system according to any one of claims 8 to 13, characterized by comprising the steps of:
s1, contacting the detection probe with the human body to acquire the acquisition data of the bioelectricity of the human body;
s2, the data processing module outputs a switch control instruction to the processor through the communication module to control the first analog switch and the second analog switch, and then the acquired data is processed through the detection circuit to enable the processor to obtain detection data;
and S3, the processor transmits the detection data to the data processing module through the communication module, and the data processing module processes the detection data through an alternating current source demodulation method to obtain the human body electricity information.
15. The method according to claim 14, wherein the step S2 includes:
when the first analog switch and the second analog switch are both switched off, the second detection processing unit detects the output voltage of the detection module and obtains potential data through the processor;
when the first analog switch is switched off and the second analog switch is switched on, the first detection processing unit and the second detection processing unit detect the output voltage of the detection module and obtain resistance data through the processor;
when the first analog switch is turned on and the second analog switch is turned off, the first detection processing unit and the second detection processing unit detect the output voltage of the detection module and obtain capacitance data through the processor.
16. The method according to claim 15, wherein in step S3, the processor transmits the potential data, the resistance data and the capacitance data to the data processing module through the communication module, respectively, and the data processing module processes the potential data by the ac source demodulation method to obtain body potential information; the data processing module processes the resistance data through the alternating current source demodulation method to obtain human body resistance information; and the data processing module processes the capacitance data through the alternating current source demodulation method to obtain the human body capacitance information.
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