CN101000318A - Sensor array based on temperature control and gas detection method - Google Patents
Sensor array based on temperature control and gas detection method Download PDFInfo
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Abstract
The invention relates to a sensor array based on temperature control and a gas detection method, comprising a sealed gas chamber, a sensor array, a temperature control circuit, a sensor array working circuit, a data acquisition card and a computer which are mutually and electrically connected, wherein the temperature control circuit controls the working temperature of the sensor array in the detection process to acquire gas information in the reaction process; the gas detection method comprises the steps of selecting a sensor array according to the characteristics of the gas to be detected, introducing the gas to be detected after the sensor array works stably in clean air, obtaining a voltage signal on a sampling potentiometer, sending the voltage signal to a computer through filtering and a data acquisition card, displaying a current response signal in real time, and giving a recognition result through a trained BP network. The invention can obtain a large amount of characteristic information in the gas reaction process, flexibly adjusts the gas to be detected, has good repeatability, strong stability, synchronous signal detection and data acquisition and high recognition rate.
Description
Affiliated field the present invention relates to the sensor field of gas detection, and is particularly a kind of based on temperature controlled sensor array and gas detection method.
The background technology gas sensor is one main kind of as chemical sensor, obtained using widely in industries such as automobile, Aero-Space, agricultural, fire-fighting, chemical analysis, biology and environmental protection, customs's detections, gas detection technology has also obtained bigger progress.Up to now, developed the gas sensor of many practicalities, as metal oxide semiconductor sensor, electrochemical sensor, conduction complex sensor, surface acoustic wave sensor etc.Wherein metal oxide semiconductor sensor has advantages such as response speed is fast, good stability, less energy consumption, life-span length, and its application is also extensive, has practical value most.But, differentiate that with a kind of gas sensor the concentration of certain gas or quantitative test mixed gas all is very difficult because the operating characteristic of all gases sensor all has nonlinear with different degree and non-single selective.Gas sensor array is combined by a plurality of gas sensors with different response characteristics, when multiple gases is detected, requires each sensor also need have the broad-spectrum response characteristic simultaneously in the sensitivity that embodies self, and suitable redundance is arranged.
Compare with the pure gas sensor detecting, sensor array has improved the sensitivity, reliability and the repeatability that detect effectively, makes sensing range wideer.For a long time, the sensor array change in resistance that adopt constant heating voltage to obtain its sensitive membrane more, the gas information of obtaining under this working method seldom, and exist " drift effect ", promptly to a kind of gas, for example to metrifonate, the optimum oxidation temperature difference of twice test, about always having the drift and have a temperature range, finally cause the reappearance of experimental result undesirable.
By retrieval; United States Patent (USP) United States Patent6 is arranged; 235; 243 Fleischer; et al.May 22; 2001; patent name " Gas sensor array for detecting individual gasconstituents in a gas mixture (gas sensor array that is used for the single composition detection of mixed gas) "; its patented technology scheme is: arrange the oxide sensor array on the dielectric base plane; array is provided with protecting sheathing outward and avoids external disturbance; sensor is linked to each other by electrode each other, obtains reacted conductivity.During detection sensor is heated to pre-set temperature, different sensors is provided with different heating-up temperatures, and each sensor tip is to the different response signal of the different generations of the component in the mixed gas, and the lead-in signal processing unit is handled.This patent for each sensor provides the mechanism of heating separately, guarantees each working sensor at the detection of a certain composition gas in the mixed gas under the temperature of appointment separately, obtains the different electricity of each sensor and leads variation.But this is the expansion of constant heating work pattern, and the signal that is obtained remains single steady-state value in fact, can not eliminate the interfere information at other compositions of mixed gas effectively, has wasted much to help the gas characteristic differentiated.
By retrieval, having Chinese patent " based on the food smell fast non-destructive detection method and the device of gas sensor array technology " to authorize publication number is CN 1194227C, this patent provides a kind of method of utilizing the food smell Non-Destructive Testing that gas sensor array and pattern-recognition combine, designed the bar shaped gas sensor array reaction chamber of sealing, each sensor evenly is staggeredly placed, and finishes obtaining and analyzing the food smell signal by A/D capture card, sensor array modulate circuit and computing machine.This patent has guaranteed to react in the testing process the stable of indoor environment on device, mainly be to obtain sensor array to be listed in response under the equilibrium temperature, but this also causes the gas response signal of sensor array single relatively, quantity of information seldom, do not get access to the main flow information of course of reaction, can not reflect the characteristic and the principal character of gas itself; In addition in the selection of sensor array; do not consider broad-spectrum selectivity and sensor each other the cross-sensitivity of sensor array to multiple smell yet; this can cause the transition of information redundant and unstable usually, is unfavorable for follow-up feature extraction and pattern-recognition.
Summary of the invention
Purpose of the present invention: be listed in deficiency in the gas detection at sensor array in the background technology, proposed a kind of based on temperature controlled sensor array and gas detection method, select sensor forming array with broad-spectrum selectivity and suitable cross-sensitivity according to the characteristic of tested gas, control each working sensor variation of temperature by temperature-control circuit, cause the resistance value on sensitive membrane surface changing in time, formed hyperspace response modes, greatly enriched the gas response message test gas.According to the job requirement of each sensor, as output, show in real time on computers by data collecting card and corresponding software with the voltage change signal on the sampling potentiometer in the sample circuit.
Technical scheme of the present invention is a kind of based on temperature controlled sensor array, the gas sensor array reaction chamber that comprises mutual electrical connection sealing, sensor array modulate circuit and computing machine are finished obtaining and analyzing signal, particularly: the gas sensor array reaction chamber of described sealing is an air chamber 2, built-in sensors array operating circuit 7, top, described air chamber 2 left sides is equipped with air intake control valve 1 and is used to control air inlet, the top, right side is equipped with aspiration pump 4 and is used to control exhaust, has promptly constituted air inlet and exhaust apparatus by operation valve 1, aspiration pump 4; Left side, described air chamber 2 belows is electrically connected with temperature-control circuit 8, is used to control the working temperature of sensor array 3, and right side, described air chamber 2 below is electrically connected with data collecting card 6, is used on computing machine 5 signal of gathering being handled in real time and being shown;
Described sensor array modulate circuit is a sensor array operating circuit 7, be equipped with the array that a plurality of gas sensors constitute, each working sensor temperature is subjected to the control of temperature-control circuit 8 during detection, and described sensor array operating circuit 7 also is equipped with sampling and filtering circuit is used for obtaining of signal and eliminates high frequency interference;
Described temperature-control circuit 8 is equipped with single-chip microcomputer, is used for frequency, the range parameter of control signal, and the working temperature of sensor array 3 is obtained the characteristic information of gas in the course of reaction in the control detection process; Described temperature-control circuit 8 also comprises power supply, charactron array of display, key control circuit, wave generator circuit, wherein power supply is to single-chip microcomputer and wave generator circuit power supply, by single-chip microcomputer wave generator circuit is controlled, output amplitude, cycle, the signal that frequency parameter is adjustable, the charactron array of display is used for when initial setting by the numeral demonstration of key assignments and the cycle that shows output signal, by the parameter adjustment of the realization of the button in key control circuit temperature control signals and the replacement of single-chip microcomputer;
Described computing machine 5 is equipped with the software program of data acquisition and processing (DAP), is used for showing in real time response curve and provides recognition result.
As a further improvement of existing technologies, the array that described a plurality of gas sensors constitute is 6 semiconductor gas sensors, and sensor model number is respectively MQ131, MQ135, MQ138, TGS822, MQ211, TGS824; Single-chip microcomputer model in the described temperature-control circuit 8 is: AT89S52.
A kind of based on temperature controlled sensor array gas detection method, comprise the signal that obtains with the processes sensor array, particularly: to toluene, ether, acetic anhydride, four kinds of gas qualitative detection of acetone, select a plurality of sensor forming arrays that tested gas had broad-spectrum selectivity and suitable cross-sensitivity according to the characteristic of these four kinds of tested gases, elder generation is to sensor array 3 preheatings before detecting, in air chamber 2, feed the variation that pure air is observed response signal, after treating that response signal is stable, preserve and detect the response signal waveform of front sensor array 3 in pure air as the original state normative reference;
When gas is detected, gas enters air chamber 2 by air intake control valve 1 and on sensor array 3 surfaces chemical reaction takes place, the temperature change of sensor array 3 in the temperature-control circuit 8 control courses of reaction, the dividing potential drop of obtaining on the sampling potentiometer of connecting with each sensor is sent into computing machine 5 through filtering circuit by data collecting card 6.
Demonstrate the current sensor array that collects continually varying 6 bar response curves in time on the computing machine 5, detect and finish back preservation data file, and utilize the BP network that trains that the data file is analyzed, provide the gas recognition result.
After detect finishing, open aspiration pump 4 exhausts 3～5min, open air intake control valve 1 then and in air chamber, feed pure air, treat to carry out the detection of gas next time when response curve meets the original state normative reference of setting.
Beneficial effect with respect to prior art
" based on the food smell fast non-destructive detection method and the device of gas sensor array technology " patent provides a kind of method of utilizing the food smell Non-Destructive Testing that gas sensor array and pattern-recognition combine in the prior art, designed the bar shaped gas sensor array reaction chamber of sealing, each sensor evenly is staggeredly placed, and finishes obtaining and analyzing the food smell signal by A/D capture card, sensor array modulate circuit and computing machine.This patent has guaranteed to react in the testing process the stable of indoor environment on device, mainly be to obtain sensor array to be listed in response under the equilibrium temperature, but this also causes the gas response signal of sensor array single relatively, quantity of information seldom, do not get access to the main flow information of course of reaction, can not reflect the characteristic and the principal character of gas itself; In addition in the selection of sensor array; do not have to consider to selectivity and sensor each other the cross-sensitivity of sensor array to multiple smell yet; this can cause the transition of information redundant and stable usually, is unfavorable for follow-up feature extraction and pattern-recognition.
Compare with existing gas sensor detection technique, the invention provides the air chamber 2 of sealing, sensor array 3, temperature-control circuit 8, sensor array operating circuit 7, data collecting card 6 and the computing machine 5 that is electrically connected obtains more gas information in the course of reaction by the working temperature of sensor array in the temperature-control circuit control detection process mutually; Gas detection method is to select a plurality of sensor forming arrays that tested gas had broad-spectrum selectivity and suitable cross-sensitivity, when being listed in, sensor array feeds tested gas in the pure air behind the steady operation, wave circuit and data collecting card are sent into computing machine after filtration to obtain the voltage signal of sampling on the potentiometer, current response signal is shown in real time, provide recognition result by the BP network that trains.
Parameters such as the amplitude by mcu programming being made the temperature-control circuit output signal, cycle, frequency are adjustable flexibly, the obtaining of sensor array response signal, filtering, data acquisition are carried out synchronously, the signal that collects changes and can show in real time in computing machine, is easy to observe the duty with the monitoring sensor array.
Because temperature control makes sensor array abundant widely to the response message of gas, different operating temperature lower sensor array is also different to the response characteristic of gas, the signal that gets access to no longer is the single steady-state response value or the time value of response, but continually varying response signal in time, be shown as many curves of continually varying on computers, as sensor array in Fig. 5 embodiment of the invention to shown in the response curve of toluene gas, its abundant information and reacted the response feature of tested gas is representative strong.This method has obviously improved the selectivity of gas sensor, has reduced the influence of interference and temperature drift greatly, has improved the stability of sensor array to the gas response; A large amount of characteristic informations that can get access to course of reaction characterize the characteristic of gas with various, for follow-up feature extraction and mode identification technology provide information fully reliably, have improved discrimination.
The gas recognition result shown in the following Network Recognition result and the expectation value table of comparisons, experiment showed, utilization detection method of the present invention to the discrimination of multiple gases more than 97%.
| Test gas | The output of BP network | Desired output | |
| First group | Second group | ||
| Toluene ether acetone acetic anhydride | 0.9907 2.1013 2.9102 4.0837 | 1.1022 1.9812 2.9894 3.9136 | 1 2 3 4 |
Description of drawings
The present invention is described further below in conjunction with accompanying drawing and example.
Fig. 1 is a detection principle schematic of the present invention.
Fig. 2 is a temperature-control circuit theory diagram among the present invention.
Fig. 3 is the operating circuit synoptic diagram of sensor array among the present invention.
Fig. 4 is a sensitivity curves calibration maps of selecting sensor array to make in the embodiment of the invention.
Fig. 5 be in the embodiment of the invention sensor array to the response curve of toluene gas.
Fig. 6 is the process flow diagram of gas detection method of the present invention.
Fig. 1 is a detection principle schematic of the present invention.Wherein 1 is air intake control valve, and 2 is the good air chamber of sealing, and 3 is sensor array, and 4 is aspiration pump, and 5 is computing machine, and 6 is data collecting card, and 7 is the sensor array operating circuit, and 8 is temperature-control circuit.Air intake control valve 1 control air inlet, aspiration pump 4 carries out exhaust to air chamber 2 after detecting end.Sensor array 3 is made of a plurality of gas sensors, is 6 semiconductor gas sensors, and sensor model number is respectively MQ131, MQ135, MQ138, TGS822, MQ211, TGS824.The temperature-control circuit 8 of sensor array 3 and data collecting card 6 are electrically connected with working sensor circuit 7 in the air chamber 2 by lead all outside air chamber 2.
In Fig. 1, a kind of based on temperature controlled sensor array, comprise that the gas sensor array reaction chamber of mutual electrical connection sealing, sensor array modulate circuit and computing machine finish to the obtaining and analyzing of signal, particularly:
The gas sensor array reaction chamber of sealing is an air chamber 2, built-in sensors array operating circuit 7, top, air chamber 2 left sides is equipped with air intake control valve 1 and is used to control air inlet, and the top, right side is equipped with aspiration pump 4 and is used to control exhaust, has promptly constituted air inlet and exhaust apparatus by operation valve 1, aspiration pump 4; Left side, air chamber 2 belows is electrically connected with temperature-control circuit 8, is used to control the working temperature of sensor array 3, and right side, air chamber 2 below is electrically connected with data collecting card 6, is used on computing machine 5 signal of gathering being handled in real time and being shown;
The sensor array modulate circuit is a sensor array operating circuit 7, be equipped with the array that a plurality of gas sensors constitute, each working sensor temperature is subjected to the control of temperature-control circuit 8 during detection, and sensor array operating circuit 7 also is equipped with sampling and filtering circuit is used for obtaining of signal and eliminates high frequency interference;
Temperature-control circuit 8 is equipped with its model of single-chip microcomputer: AT89S52, be used for frequency, the range parameter of control signal, and the working temperature of sensor array 3 is obtained the characteristic information of gas in the course of reaction in the control detection process; Temperature-control circuit 8 also comprises power supply, charactron array of display, key control circuit, wave generator circuit, wherein power supply is to single-chip microcomputer and wave generator circuit power supply, by single-chip microcomputer wave generator circuit is controlled, output amplitude, cycle, the signal that frequency parameter is adjustable, the charactron array of display is used for when initial setting by the numeral demonstration of key assignments and the cycle that shows output signal, by the parameter adjustment of the realization of the button in key control circuit temperature control signals and the replacement of single-chip microcomputer;
In the detection principle schematic of the present invention based on temperature controlled sensor array gas detection method, comprise the signal that obtains with the processes sensor array, particularly: to toluene, ether, acetic anhydride, four kinds of gas qualitative detection of acetone, select a plurality of sensor forming arrays that tested gas had broad-spectrum selectivity and suitable cross-sensitivity according to the characteristic of these four kinds of tested gases, elder generation is to sensor array 3 preheatings before detecting, in air chamber 2, feed the variation that pure air is observed response signal, after treating that response signal is stable, preserve and detect the response signal waveform of front sensor array 3 in pure air as the original state normative reference;
Earlier to sensor array 3 preheatings, in air chamber 2, feed pure air before detecting, regulate the minimum starting potential that the sampling potentiometer is set output signal, preserve and detect the response signal waveform of front sensor array 3 in pure air as the original state normative reference; When gas is detected, gas enters air chamber 2 by air intake control valve 1 and on sensor array 3 surfaces chemical reaction takes place, the temperature change of sensor array 3 in the temperature-control circuit 8 control courses of reaction, the dividing potential drop of obtaining on the sampling potentiometer of connecting with each sensor is sent into computing machine 5 through filtering circuit by data collecting card 6; Demonstrate the current sensor array that collects 3 continually varying 6 bar response curves in time on the computing machine 5, detect and finish back preservation data file, and utilize the BP network that trains that the data file is analyzed, provide the gas recognition result; After detect finishing, open aspiration pump 4 exhausts 3～5min, open air intake control valve 1 then and in air chamber 2, feed pure air, treat to carry out the detection of gas next time when response curve meets the original state normative reference of setting.
The sampling potentiometer is set in the sensor array operating circuit 7, unified reference sample voltage VC can be set in each sensor two ends, as VC=5v, sensor is connected with the sampling potentiometer, with the duty of the reflection of the voltage change signal on the sampling potentiometer wherein when front sensor, the regulator potentiometer resistance changes the output area of output signal, and the requirement that can satisfy the different sensors normal working voltage is beneficial to the observation and the analysis of signal again; In the detection, air intake control valve and aspiration pump are controlled air inlet and exhaust, feed pure air behind the exhaust 3min and make test macro return to original state, determine whether to carry out test next time by observe the current response signal of contrast in computing machine 5.
Fig. 2 is a temperature-control circuit theory diagram among the present invention.Power supply wherein is to single-chip microcomputer and wave generator circuit power supply, by single-chip microcomputer wave generator circuit is controlled, output amplitude, frequency, the signal that cycle parameter is adjustable, the charactron array of display is used for when initial setting that numeral by key assignments shows and the demonstration of setting cycle during signal output, realize the parameter adjustment of temperature control signals and the replacement of single-chip microcomputer by the button in the key control circuit, the single-chip microcomputer model is AT89S52.
Fig. 3 is the operating circuit synoptic diagram of sensor array among the present invention.Sensor array 3 wherein is made of a plurality of semiconductor gas sensors, respectively corresponding the 1st to n the sensor of S1～Sn, and VC is a sampled voltage, R is the sampling potentiometer, but capacitor C filter away high frequency noise in parallel with R.8 obtain the gas reaction information of sensor array 3 for the temperature change of temperature-control circuit control sensor array 3, and by the gas response of the change in voltage reflection sensor array 3 on the sampling potentiometer R, data collecting card 6 is sent in filtering through capacitor C again.
Fig. 4 is a sensitivity curves calibration maps of selecting sensor array to make in the embodiment of the invention.Fig. 4 a, Fig. 4 b are respectively sensor MQ131 and the sensor MQ135 sensitivity curve maps to toluene, ether, acetic anhydride, acetone, and it has shown the variation when four kinds of tested gases these two sensor sensings during with concentration change.Demarcate to analyze selectivity and the cross-sensitivity of each sensor to tested gas by sensitivity curves, select a plurality of sensors forming array of arranging in pairs or groups mutually according to this, the validity that signal obtains when having guaranteed to detect improves the accuracy rate of recognition result.
Fig. 5 be in the embodiment of the invention sensor array to the response curve of toluene gas.Respectively corresponding 6 sensors of S1～S6 wherein, it has reflected in the course of reaction of 0～90s time, sensor array is listed in the situation of change of its response curve under the control of temperature-control circuit.
Fig. 6 is the process flow diagram of gas detection method of the present invention.The flow process of gas detection method is: gas detection begins (step 100), opening power, sensor preheating (step 110), feed pure air observation signal output (step 120) subsequently, does the output signal of observing this moment meet original state normative reference (step 130)? as denying, then needing to continue preheating observation signal output knows and meets original state normative reference (step 140), in this way, then the signal output of this moment has reached the initial reference state and can open air intake control valve and feed tested gas (step 150), reaction begins to carry out in the air chamber, in step 160, obtain response signal, filtering, carry out data acquisition, finish through sampling after a while, preserve and detect data (step 170), carry out data analysis by computing machine subsequently, provide recognition result (step 180), open aspiration pump exhaust 3～5min (step 190) then, then in step 200, judge whether to carry out to detect next time? then turn back to step 120 in this way and feed pure air observation signal output again, as otherwise powered-down finishes (step 210).
Embodiment
Present embodiment based on temperature controlled sensor array and gas detection method to toluene, ether, acetic anhydride, four kinds of gas qualitative detection of acetone, select a plurality of sensor forming arrays that tested gas had broad-spectrum selectivity and suitable cross-sensitivity, determine 6 semiconductor gas sensor: MQ131, MQ135, MQ138, TGS822, MQ211, TGS824 forming array.Detect before the beginning at first opening power and start computing machine, sensor array is carried out preheating, regulate the sampling potentiometer one by one and make that the minimum starting potential of each sensor output signal remains on below the 0.5v and spaced apart being easy to respectively in the pure air environment.
Power supply is to the working sensor circuit, and the temperature-control circuit power supply shows the parameter of inspection temperature-control circuit signal and the duty of circuit by the number in the temperature-control circuit.Sensor needs the preheated one-section time just can reach steady state (SS), in air chamber, feed pure air, state and variation tendency by the monitoring of the data acquisition interface in computing machine current demand signal, monitor the duty of each sensor in real time, guarantee the operate as normal of detection system, approximately the response curve of all the sensors tends towards stability behind the 10min, preserves the response curve of this moment, as the original state normative reference before each detection.
Testing process: (one) opens air intake control valve 1 and feeds tested gas, treats to close air intake control valve 1 after tested gas all enters air chamber 2.This moment, chemical reaction took place on the sensitive membrane surface of each sensor in gas, and reaction reaches balance gradually.Signals collecting begins synchronously, the response signal that can show each current sensor on the computing machine 5, the variation of sensor array 3 sensitive membrane surface resistances causes that the dividing potential drop on the sampling potentiometer R changes, and the voltage signal of this variation is collected in the computing machine 5 by data collecting card 6 through filtering.
(2) temperature control signals that produces of temperature-control circuit 8 is connected on the working sensor circuit 7 in the air chamber 2 by lead, make the working temperature of sensor array 3 change, cause the sensor sensing film surfactivity in whole testing process, to be subjected to the control of temperature control signals with the mode of operation that configures in advance.The chemical reaction on sensitive membrane surface carries out 3～5min and reaches dynamic balance, finishes sampling this moment, preserves interior during this period of time signal data.Open aspiration pump 4 then and carry out exhaust, exhaust process continues about 3min, opens operation valve 1 subsequently and feeds clean air and make the responsive state of sensor array 3 return in balance when initial, and is ready for detecting next time.Fig. 5 be in the embodiment of the invention sensor array to the response curve of toluene gas.
(3) detected signal data is read in the analysis of data and processing, provides testing result by the BP network that trains.
After the stable working state of detection system in pure air, (one), (two), (three) three go on foot capable of circulation carrying out, and good reproducibility is flexible and efficient.
The data processing section that the present invention is based on temperature controlled sensor array and gas detection method provides last testing result, but need the repeatedly tested gas of duplicate detection, through setting up raw data base, the a series of steps such as each parameter of extraction feature, the java standard library of setting up discriminant function, training BP neural network are finished by programming.In case the java standard library of discriminant function is set up, the BP network training is finished, and then detection can both provide testing result after finishing at once each time.
The gas recognition result shown in the following Network Recognition result and the expectation value table of comparisons, two groups of every kind of gas detection, recognition result and expectation value error differ less.Experiment showed, utilization detection method of the present invention to the discrimination of multiple gases more than 97%.
| Test gas | The output of BP network | Desired output | |
| First group | Second group | ||
| Toluene ether acetone acetic anhydride | 0.9907 2.1013 2.9102 4.0837 | 1.1022 1.9812 2.9894 3.9136 | 1 2 3 4 |
Obviously, those skilled in the art can carry out various changes and modification based on temperature controlled sensor array and gas detection method and not break away from the spirit and scope of the present invention of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (4)
1, a kind of based on temperature controlled sensor array, comprise that the gas sensor array reaction chamber of mutual electrical connection sealing, sensor array modulate circuit and computing machine finish the obtaining and analyzing of signal, it is characterized in that:
The gas sensor array reaction chamber of described sealing is air chamber (2), built-in sensors array operating circuit (7), top, described air chamber (2) left side is equipped with air intake control valve (1) and is used to control air inlet, the top, right side is equipped with aspiration pump (4) and is used to control exhaust, has promptly constituted air inlet and exhaust apparatus by operation valve (1), aspiration pump (4); Left side, described air chamber (2) below is electrically connected with temperature-control circuit (8), be used to control the working temperature of sensor array (3), right side, described air chamber (2) below is electrically connected with data collecting card (6), is used on computing machine (5) signal of gathering being handled in real time and being shown;
Described sensor array modulate circuit is sensor array operating circuit (7), be equipped with the array that a plurality of gas sensors constitute, each working sensor temperature is subjected to the control of temperature-control circuit (8) during detection, and described sensor array operating circuit (7) also is equipped with sampling and filtering circuit is used for obtaining of signal and eliminates high frequency interference;
Described temperature-control circuit (8) is equipped with single-chip microcomputer, is used for frequency, amplitude, the cycle parameter of control signal, and the working temperature of sensor array in the control detection process (3) is obtained the characteristic information of gas in the course of reaction; Described temperature-control circuit (8) also comprises power supply, charactron array of display, key control circuit, wave generator circuit, wherein power supply is to single-chip microcomputer and wave generator circuit power supply, by single-chip microcomputer wave generator circuit is controlled, output amplitude, cycle, the signal that frequency parameter is adjustable, the charactron array of display is used for when initial setting by the numeral demonstration of key assignments and the cycle that shows output signal, by the parameter adjustment of the realization of the button in key control circuit temperature control signals and the replacement of single-chip microcomputer;
Described computing machine (5) is equipped with the software program of data acquisition and processing (DAP), is used for showing in real time response curve and provides recognition result.
2, according to claim 1 a kind of based on temperature controlled sensor array, it is characterized in that: the array that described a plurality of gas sensors constitute, be 6 semiconductor gas sensors, sensor model number is respectively MQ131, MQ135, MQ138, TGS822, MQ211, TGS824.
3, according to claim 1 a kind of based on temperature controlled sensor array, it is characterized in that: the single-chip microcomputer model in the described temperature-control circuit (8) is: AT89S52.
4, a kind ofly comprise the signal that obtains with the processes sensor array, it is characterized in that based on temperature controlled sensor array gas detection method:
To toluene, ether, acetic anhydride, four kinds of gas qualitative detection of acetone, select a plurality of sensor forming arrays that tested gas had broad-spectrum selectivity and suitable cross-sensitivity according to the characteristic of these four kinds of tested gases, elder generation is to sensor array (3) preheating before detecting, in air chamber (2), feed the variation that pure air is observed response signal, after treating that response signal is stable, preserve and detect the response signal waveform of front sensor array (3) in pure air as the original state normative reference;
When gas is detected, gas enters air chamber (2) by air intake control valve (1) and on sensor array (3) surface chemical reaction takes place, the temperature change of sensor array (3) in temperature-control circuit (8) the control course of reaction, the dividing potential drop of obtaining on the sampling potentiometer of connecting with each sensor is sent into computing machine (5) through filtering circuit by data collecting card (6);
Demonstrate the current sensor array that collects (3) continually varying 6 bar response curves in time on the computing machine (5), detect and finish back preservation data file, and utilize the BP network that trains that the data file is analyzed, provide the gas recognition result;
After detect finishing, open aspiration pump (4) exhaust 3～5min, open air intake control valve (1) then and in air chamber (2), feed pure air, treat to carry out the detection of gas next time when response curve meets the original state normative reference of setting.
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