The present invention relates to intelligent alarm device, in particular it relates to a kind of intelligent benezene material alarm device.
The content of the invention
For the above-mentioned deficiency of prior art, the invention provides a kind of intelligent benezene material alarm device, to solveAbove-mentioned technical problem.
In order to solve the above-mentioned technical problem, the present invention is achieved by the following technical programs：
A kind of intelligent benezene material alarm device, including microprocessor module, wireless WIFI module, gas sensor mouldBlock, alarm module and mobile terminal module；The microprocessor module is connected with wireless WIFI module；The gas sensorModule and alarm module are connected with microprocessor module；The wireless WIFI module and mobile terminal module wireless connection.
Relative to prior art, beneficial effects of the present invention：
Integrated level of the invention is high, small volume, low cost, and wireless WIFI module of the invention is using wireless WIFI networkTo transmit data, therefore transmitting range is remote.User can by the air quality in mobile terminal monitor in real time domestic environment, whenWhen benezene material is exceeded in domestic environment, alarm modules can send alarm, and WIFI module can also be passed by wireless WIFI networkAlarm to the mobile terminal of user is sent, reminds user to check the pollution sources in domestic environment in time, eliminated safe hidden trouble in time.ThisThe intelligent benezene material alarm device of invention can detect that the volatility such as formaldehyde, acetaldehyde and dibutyl phthalate class are organicGas, sensitivity is high, fast response time, reproducible, and stability is preferable.Detection formaldehyde, acetaldehyde and the fourth of phthalic acid twoThe limting concentration of ester respectively reaches 0.039,0.025,0.015ppm, response frequency also preferably, reaches the level sheet of 250Hz/ppmDevelopment and application of the invention to smart home have important meaning, with wide market prospects.
Specific embodiment
The invention will be further described with the following Examples.
Fig. 1 is structural representation of the invention, as shown in figure 1, including microprocessor module, wireless WIFI module, air-sensitiveSensor assembly, alarm module and mobile terminal module；The microprocessor module is connected with wireless WIFI module；The gasDependent sensor module and alarm module are connected with microprocessor module；The wireless WIFI module and mobile terminal module withoutLine is connected.
Preferably, the alarm module includes voice broadcast unit and LED flashing lamps.
Preferably, the mobile terminal module is mobile phone or panel computer.
Preferably, the gas sensor module includes benzene class specificity gas sensor.
The response frequency of intelligent benezene material alarm device of the invention is calculated and obtained by following formula：In formula, Δ M represents the quality variable, f0The fundamental frequency of gas sensor is represented, this experiment is adoptedFundamental frequency is 10MHz；A represents the response area of gas sensor.
Wireless WIFI module of the invention is that data are transmitted using wireless WIFI network, therefore transmitting range is remote.UserCan be by the air quality in mobile terminal monitor in real time domestic environment, when benezene material is exceeded in domestic environment, alarmModule can send alarm, and WIFI module also can transmit alarm to the mobile terminal of user, remind and use by wireless WIFI networkFamily checks the pollution sources in domestic environment in time, eliminates safe hidden trouble in time.
A kind of intelligent benezene material alarm device provided in embodiments of the invention is described below to be usedBenzene class specificity gas sensor structure.
Gas sensor includes gas sensor shell, and detection air chamber, vibration are provided with the gas sensor shellDevice, frequency counter and beat-frequency meter；The detection air chamber upper and lower ends are respectively arranged with air admission hole, set free in detection air chamberBai Jingzhen and test crystal oscillator, blank crystal oscillator and test crystal oscillator are respectively electrically connected with corresponding oscillator and frequency counter,The two ends of the beat-frequency meter are connected to frequency counter, and the 3rd end of the beat-frequency meter electrically connects with microcomputer controller；2~4 air admission holes are set on the detection air chamber, while the quantity of blank crystal oscillator is provided accordingly to 1~3, crystal oscillator is testedQuantity be set to 3~6.
For the ease of data tracing and access data, micro-display and chain of command are additionally provided with microcomputer controllerPlate, in order to cost-effective and gas sensor profile is more attractive in appearance,.
Preferably, gas sensor includes gas sensor shell, and detection gas is provided with the gas sensor shellRoom, oscillator, frequency counter and beat-frequency meter；The detection air chamber upper and lower ends are respectively arranged with air admission hole, in detection air chamberBe provided with blank crystal oscillator and test crystal oscillator, blank crystal oscillator and test crystal oscillator respectively with corresponding oscillator and frequency counterElectrically connect, the two ends of the beat-frequency meter are connected to frequency counter, the 3rd end of the beat-frequency meter and microcomputer controllerElectrically connect；2~3 air admission holes are set on the detection air chamber, while the quantity of blank crystal oscillator is provided accordingly to 1~2, are surveyedThe quantity for trying crystal oscillator is set to 3~5.
In the present embodiment, as shown in figure 1, gas sensor includes gas sensor shell, outside the gas sensorDetection air chamber, oscillator, frequency counter and beat-frequency meter are provided with shell；It is described detection air chamber upper and lower ends be respectively arranged with intoStomata, is provided with blank crystal oscillator and test crystal oscillator in detection air chamber, blank crystal oscillator and test crystal oscillator respectively shake with correspondingSwing device and frequency counter is electrically connected, the two ends of the beat-frequency meter are connected to frequency counter, the 3rd of the beat-frequency meter theEnd electrically connects with microcomputer controller；Detect and 2 air admission holes are provided with air chamber, 1 blank crystal oscillator, 1 test crystal oscillator, itsIn, the surface for testing crystal oscillator is coated with air-sensitive coating, and the air-sensitive coating is made up of nano polyaniline-activated carbon, because air-sensitive is passedThe air-sensitive performance of sensor depends primarily on the air-sensitive coating of its surface coating, therefore, preparation nanometer is gathered during the present invention is given belowThe specific steps of aniline-activated carbon coating, it is for reference：
S1. quantitative aniline and ammonium persulfate are added in hydrochloric acid solution, keep the thing of aniline monomer and ammonium persulfateThe ratio between amount of matter is 1:1~1.2；
S2. half an hour is vibrated in Ultrasound Instrument, 3~5h is stood and is obtained Nano-fibrous PANI；
S3. the hydrochloric acid solution of a certain proportion of nano active carbon powder and Nano-fibrous PANI is mixed into (nano activeCarbon powder：Nano-fibrous PANI=1:5~8), and ultrasound 30min in Ultrasound Instrument is placed in, aniline is adsorbed on activated carbon；
S4. dissolve ammonium persulfate into again in hydrochloric acid solution, under conditions of magnetic agitation, ammonium persulfate hydrochloric acid solution is delayedSlow is added dropwise in the activated carbon hydrochloric acid solution for having adsorbed polyaniline, and Control release temperature is 4~8 DEG C, reacts 2~5h；
S5. in order to increase gained target product adsorption ratio, above-mentioned solution is placed into non-Fluorine containing olefine atmosphereIn, irradiation polymerization is carried out in the irradiation field of cobalt -60, the irradiation polymerization time is 3~6h, and irradiation dose is 100~200Gy/min；
S6. question response terminates rear vacuum filtration, by product deionized water, ethanol wash to colourless, in 60~80DEG C vacuum drying, that is, obtain nano polyaniline-activated carbon, makes the loose structure borehole enlargement of the gas sensitive, and specific surface area increasesGreatly.
The air-sensitive coating of surface coating of the invention, above scribbles gas sensitization film, when the absorption of tested gas molecule is in gasWhen in sensitive membrane, the quality of film increases, and causing the resonant frequency of quartz crystal oscillator reduces.With high sensitivity, under detectionLimit can reach even ppb grades of the ppm of gas concentration.Gas sensor has simple structure, with low cost, sensitivity high, steadyQualitative good the advantages of, a focus of gas sensor research is before had become afterwards.
Experimental example
To using nano polyaniline-activated carbon as the gas sensor PARA FORMALDEHYDE PRILLS(91,95) of gas sensitive coating, acetaldehyde and adjacent benzeneFour kinds of gases of dibutyl carboxylic acid are tested, and evaluate response speed and limting concentration of the gas sensor to gas with various,And then evaluate the size of the detecting domains of a kind of intelligent benezene material alarm device that embodiments of the invention are provided.The intellectualityThe data of benezene material alarm device and being compared as follows shown in table 1 using HPLC method detection datas：
The comparing of the data and HPLC method detection datas of the intelligent benezene material alarm device of table 1
| Limting concentration (ppm) | Response frequency (Hz/ppm) | HPLC(ppm) |
| Formaldehyde | 0.039 | 254 | 0.045 |
| Acetaldehyde | 0.025 | 238 | 0.035 |
| Dibutyl phthalate | 0.015 | 265 | 0.020 |
The as shown by data of above-mentioned intelligent benezene material alarm device, above-mentioned intelligent benezene material alarm device can be examinedThe VOCs such as formaldehyde, acetaldehyde and dibutyl phthalate class are surveyed, sensitivity is high, and fast response time is reproducible,And stability is preferable.Detection formaldehyde, the limting concentration of acetaldehyde and dibutyl phthalate respectively reach 0.039,0.025,0.015ppm, response frequency also preferably, reaches the level of 250Hz/ppm, in monitoring formaldehyde, acetaldehyde and dibutyl phthalateThe limit return detection limit concentration of the concentration more than HPLC.With existing fire-fighting intellectuality benezene material alarm device phaseThan, its profile and volume all more light weights, and returned data time and accuracy rate all significantly increase, can be as household fire-fighting intelligenceThe use of benezene material alarm device can be changed.
Finally it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than the present invention is protectedThe limitation of scope is protected, although being explained to the present invention with reference to preferred embodiment, the those of ordinary skill of this neighborhood shouldWork as understanding, technical scheme can be modified or equivalent, without deviating from the reality of technical solution of the present inventionMatter and scope.