One kind experiment casing multi-point temp humidity detectorTechnical field
The present invention relates to Temperature and Humidity technical field, and in particular to one kind experiment casing multi-point temp Humidity Detection dressPut.
Background technology
Temperature, humidity are to cause one of the principal element of component failure.According to statistics, electronic component often raises 2 DEG C, itsReliability will decline 2%.Meanwhile, humidity is too high, and moisture can be invaded through IC chip Plastic Package from gaps such as pinsInside IC chip, IC chip hygroscopic effect is produced, aoxidize IC chip device inside metal, causedProduct bug.According to statistics, the annual industry manufacture defective products for having more than 1/4 in the whole world is relevant with the harm of humidity.Therefore, temperature andThe detection of humidity is of crucial importance, and particularly the closure for environmental test tests casing, for the Temperature and Humidity Control of its casingParticularly strict, such as walk-in type high-and-low temperature humid heat test box, its spin manifold temperature uniformity is no more than ± 2 DEG C, humidity uniformity deviationFor(being ± 5%RH during less than 75%RH), after more than this deviation range, it will bring new mistake to test specimenEffect pattern, meanwhile, also can be that the Reliability assessment of sample introduces new error.
Traditional Temperature and Humidity, is that detection means or sensor probe are placed in casing, then obtains correlationTest data.When testing casing and being smaller, possible detection means cannot be put into chamber body at all, can only be put detection meansPut on the side of experiment casing, sensor probe through experiment body side instrument connection by way of wire is drawn, is obtainedRequired test data.If be placed in tested casing using by detection means, because detection means is when workCan generate heat, will inevitably bring temperature error.Meanwhile, the space occupied by detection means, can give temperature, humidity it is uniformProperty detection band carrys out certain error.If by the way of sensor probe to be placed in experiment casing, generally, a sensingDevice probe is drawn by two lines, and the point surveyed if necessary to cloth is a lot, such as even more many more than 64, then the wire of sensor probeThere to be more than 128, so many wires possibly all by the instrument connection of casing cannot will cause detection to carry out.Meanwhile,By in experimental box body, the diffusion path of spin manifold temperature and humidity is tested in inevitably influence to so many wire, so as to influenceThe correctness of testing result.Traditional platinum resistance temperature sensor is popped one's head in, it is necessary to low using a kind of expensive, temperature coefficientNickel-coated wire just can guarantee that certainty of measurement, therefore, when the test point position of distribution increases, cost will also increase therewith.
The content of the invention
For above-mentioned prior art, casing multi-point temp humidity detector is tested present invention aim at one kind is provided,Overcome influence of the experiment box volume to temperature and humidity measurement result, solving prior art cannot be normal in the presence of a large amount of cloth measuring pointsMeasure, the technical problem such as error is big and cost is high；Additionally, instant invention overcomes technology prejudice, prejudice will sensor it is highDegree is integrated in chamber body, is easy to use, and is measured convenient and simple；But, its cost have lost pole considerably beyond beneficial effectBig certainty of measurement and measurement demand compared with small test casing can not be met.
To reach above-mentioned purpose, the technical solution adopted by the present invention is as follows：
One kind experiment casing multi-point temp humidity detector, including experiment casing, described chamber are provided with vitroTemperature sensor group and humidity sensor；
Power module and micro-control module are provided with described chamber body；
Described experiment casing is provided with transport module, LED display module and for the external world for gathering transducing signalThe serial communication modular of data interaction；
Described temperature sensor group is cascaded by CAN；
Described temperature sensor group and humidity sensor send TEMP by transport module to micro-control module to be believedNumber and humidity sensor signal；
Described LED display module is received and shows the temperature sensor signal value and humidity sensor letter of micro-control module outputNumber value；
Described micro-control module, using one-chip computer module；
The serial communication modular connects computer by holding wire.
In such scheme, it is preferred that temperature sensor is passed from the temperature of DS18B20 types in described temperature sensor groupSensor.
In such scheme, it is preferred that also including the memory module being connected with micro-control module, memory module selects NANDS34ML01G1 flash memories.
In such scheme, it is preferred that described one-chip computer module, including STM32F103xC models single-chip microcomputer.
In such scheme, it is preferred that described LED display module, including the lcd touch of SDWe070T12 models showsScreen.
In such scheme, it is preferred that described serial communication modular, including USB communication interface.
Compared with prior art, beneficial effects of the present invention：
1st, experiment casing multi-point temp humidity detector, temperature sensor is by the way of cascade, it is to avoid temperatureWhile test point increases, cause the increase of lead, so as to influence the uniformity of chamber body temperature and humidity；
2nd, the present apparatus can continuously record simultaneously data storage more than 24 hours, can be whole experiment by these dataThe judgement of process provides data and supports；
3rd, the present apparatus is easy to use, and measurement is accurate, and cost performance is very high and favorable expandability.
Brief description of the drawings
Fig. 1 is the structural representation of chamber body multi-point temp humidity detector in the embodiment of the present invention, wherein 1- machinesBox, 2- touch display screens, 3- temperature sensor sockets, 4- humidity sensor sockets, 5- temperature sensors, 6- humidity sensors,7- is switched；
Fig. 2 is the catenation principle block diagram of chamber body multi-point temp humidity detector in the embodiment of the present invention.
Specific embodiment
All features disclosed in this specification, or disclosed all methods or during the step of, except mutually exclusiveFeature and/or step beyond, can combine by any way.
The present invention will be further described below in conjunction with the accompanying drawings：
Embodiment 1
As shown in Figure 2, the utility model provides a kind of experiment casing multi-point temp humidity detector, the utility modelA kind of experiment casing multi-point temp humidity detector is provided, including machine box 1, a temperature sensor being set on machine box are insertedMouth 3, m temperature sensor socket 4, touch display screen 2, shift knob 7, n temperature sensor 5, m humidity sensor 6 are (outwardAs shown in Figure 1, module frame chart is as shown in Figure 2 for shape structure).Including one-chip computer module, transport module, power module, storageModule, temperature sensor, humidity sensor, LED display module, serial communication modular, its structural feature is：The single-chip microcomputer mouldBlock connects the transport module, power module, LED display module, serial communication modular；The temperature sensor and humidity sensorDevice is connected to the micro-control module by the transport module.The serial communication modular connects computer by holding wire.
Further, the one-chip computer module uses STM32F103xC single-chip microcomputers.STM32F103xC single-chip microcomputers work temperatureThe temperature of -40 DEG C to+105 DEG C of scope is spent, supply voltage 2.0V to 3.6V, working frequency is 72MHz, internal high-speed memories(flash memory of 512K bytes and the SRAM of 64K bytes), the ADC containing 3 12,4 general 16 bit timing devices and 2 PWM determineWhen device, also comprising multiple standards and advanced communication interface.
Further, the temperature sensor is DS18B20 type temperature sensors；It has high integration, and microminiature is highThe function of precision.DS18B20 digital temperature sensors, the temperature inversion that will directly can be measured is believed for serial digitalNumber, then send single-chip microcomputer.Its interface mode is single bus interface, and both-way communication is carried out using CAN mode and single-chip microcomputer,One interface line just meets DS18B20 can be just attached with single-chip microcomputer, and after being connected with single-chip microcomputer, the communication between them isTwo-way, it is not necessary to any peripheral cell；- 55 DEG C~+125 DEG C of temperature-measuring range, 0.5 DEG C of intrinsic thermometric resolution ratio, at -10 DEG CIn the range of~+85 DEG C, precision can reach ± 0.5 DEG C, meet design requirement；Measurement result is serially transferred, and with numeralThe mode of signal is sent to single-chip microcomputer.
Further, the humidity sensor is SHT15 type Temperature Humidity Sensors.It is by it is a piece of detection relative humidity andThe hybrid sensor module of temperature and calibrated numeral output composition.It is relatively wet that this device contains a detectionThe capacitive character polymer sensing element of degree and a band gap temperature sensitive member.The two all seamless unoccupied place same ADC andIndividual serial interface circuit connection is on the same chip.This causes it to possess signal quality higher, and the response time is small and by outerDisturb very little in boundary.SHT15 Temperature Humidity Sensors can be accessed directly without external analog electronic circuit by microcontroller；Temperature, confessionThe change such as electricity, capacitance deviation and residual current does not affect precision；Even if be wetted also failure or error will not occur；Therefore haveHave long-time stability, without recalibration, reaction speed be fast, the low advantage of energy ezpenditure, be particularly well-suited to battery and power.
Further, the LED display module uses SDWe070T12 liquid crystal touch display screens.SDWe070T12 liquid crystal is touchedDisplay screen is touched, screen is 7 inches, resolution ratio is 1024*600, visible angle is 85 °.
Further, it is NAND-type flash memory that the memory module uses S34ML01G1, S34ML01G1, even if power-off, numberAccording to will not also lose.Its capacity is 1G, by 8 I/O interface data wire transport addresses information bags, 8 bit address of often bag transmissionInformation.
Further, it is preferred that the serial communication modular uses USB modes.
After start, device is automatically performed system initialization under Single-chip Controlling, and then display company relevant information, fillsPut the initialization being automatically performed to the temperature sensor and humidity sensor being connected on device.If socket is not connected with sensorDevice, display " XX is not connected with " mark.Then corresponding function is selected by touch-screen, it is determined that after, device will complete experimental box bodyThe detection of the indexs such as humiture deviation, uniformity.When needing to increase temperature detecting point, directly increased temperature sensor is led toThe mode for crossing plug is connected to last temperature sensor.
The above, specific embodiment only of the invention, but protection scope of the present invention is not limited thereto, and it is anyBelong to those skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in, all shouldIt is included within the scope of the present invention.