CN102095783A - Carbon nano tube film three-electrode sensor array and method for detecting concentration of mixed gas - Google Patents
Carbon nano tube film three-electrode sensor array and method for detecting concentration of mixed gas Download PDFInfo
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Abstract
The invention discloses a carbon nano tube film three-electrode sensor array and a method for detecting the concentration of a mixed gas. A sensor comprises a first electrode, a second electrode and a third electrode which are distributed sequentially; a ventilating hole is formed on the first electrode; a substrate on which a carbon nano tube film is distributed is attached to the inner surface of the ventilating hole; a lead-out hole is formed in the centre of the second electrode; a blind hole is formed on the board of the third electrode; and the three electrodes are isolated mutually. The method comprises the following steps of: 1) placing a plurality of sensors with different interelectrode distances; 2) exerting voltage on the electrodes; 3) measuring ion current values of the sensors; 4) forming a sample by combining the measured values and the calibration values of the concentration, the temperature and the humidity of each component of the mixed gas, and constructing a mixed gas concentration measurement database by the sample and an interpolation sample; 5) constructing a data fusion device and building a mixed gas concentration accurate measurement model; and 6) inputting the actually measured values of the sensors in the array into the measurement model to obtain accurate measured values of the concentrations of the components of the mixed gas. The sensor array is high in gas detection sensitivity, high in linearity and high in accuracy.
Description
Technical field
The present invention relates to the gas sensing field, particularly a kind of three electrode sensors and array thereof based on carbon nano-tube and gas discharge principle, and do not separating the method that directly detects mixed gas concentration under the mixed gas condition.
Background technology
Along with pressing for and the development of nanometer technology of all trades and professions gas detection, nano-sensor has obtained considerable progress.Especially along with the discovery of carbon nano-tube in latter stage in 20th century, carbon nano-tube shows tempting application prospect in gas, temperature, Humidity Detection field.Carbon nano-tube film two electrode sensors in carbon nano-tube gas-sensitive, temperature sensitive, the moisture sensor with advantages such as its detection sensitivity height, detected gas wide ranges, response are fast, become the research focus in gas, temperature, Humidity Detection field.Carbon nano-tube film two electrode gas sensors have overcome the shortcoming of carbon nano-tube gas-sensitive sensors saturated poisoning in tested gas of other type based on gas discharge principle, and gas concentration measurement scope and tested gaseous species scope are wideer.As air-sensitive, temperature sensitive, moisture sensor that sensitive material constitutes, have the irreplaceable advantage of conventional sensors with carbon nano-tube: the one, the specific surface area of carbon nano-tube is big, under the less situation of sensor overall dimensions, can improve the area of electrode greatly; Two are based on the tip curvature radius of carbon nanotube level, and working sensor voltage is greatly reduced, and obtain extremely strong electric field intensity near the carbon nano-tube tip, make tested gas ionization under low-voltage; The 3rd, the size of having dwindled sensor greatly, dynamic response is fast.Therefore, it has result of extraction at aspects such as biology, chemistry, machinery, aviation, military affairs, anti-terrorisms.
Existing carbon nano-tube film two electrode sensors comprise by people such as Liu Junhua, the Zhang Yong of Xi'an Communications University, Li Xin, professors Zhu Changchun at the international vaccum microelectronics international conference disclosed carbon nano-tube film two-electrode gas sensor (shown in Figure 1) of the 14th IVMC of calendar year 2001.This working sensor is afterwards because interpolar discharge rear space electric charge is difficult to diffusion, sensor is difficult to return to original state, and (Fig. 2 Fig. 3), can't measure gas concentration to present multivalued relation between sensor voltage breakdown, breakdown current and the gas concentration.People such as NikhilKoratkar of U.S. Rensselaer Polytech Inst (Rensselaer Polytechnic Institute) and Pulickel M professor Ajayan have developed carbon nano-tube film positive C NTFA (carbonnanotube film anode) two-electrode gas sensor.Present nonlinear relationship between this sensor voltage breakdown and the gas concentration, linear error is bigger between disruptive discharge electric current and the gas concentration; Simultaneously this sensor must with the chromatograph coupling, substitute gas detector in traditional chromatograph with CNTFA, adopt the chromatographic column isolation technics, solve identification and the measurement of concetration problem of CNTFA to mixed gas; This sensor sparking voltage and discharge current are all bigger; And can't realize the measurement of CNTFA to pure gas and mixed gas.The Hui Guohua of Zhejiang University's biomedical engineering and instrumental science institute, Chen Yuquan professor develops carbon nano-tube thin film cathode two-electrode gas sensor under the condition of 120 microns die openings, studied the flash-over characteristic of sensor in three kinds of pure gases, because sensitivity is lower, do not constitute the gas sensor of measuring concentration.
Therefore, at present to the carbon nano-tube film electrode sensor array of responsive mixed gas each component and do not separate the research that mixed gas directly detects the method for mixed gas each component concentration, become the technical matters that needs to be resolved hurrily.
Summary of the invention
One of purpose of the present invention, provide a kind of carbon nano-tube film three electrode sensors, the output current of conventional carbon nano-tube film two electrode sensors is divided into electron stream and ion flow, set up the single-valued relationship of ion flow that the present invention's three electrode sensor collectors collect and mixed gas each component concentration, temperature, humidity, overcome carbon nano-tube film two electrode sensor gas-sensitive properties and the many-valued nonlinear problem of the quick characteristic that wets.This sensor construction is simple, and cost is low, and detected gas is highly sensitive.
Another object of the present invention, provide a kind of method, form sensor array by different poles spacing carbon nano-tube film three electrode sensors and measure mixed gas each component concentration to be measured, gas temperature and humidity respectively based on carbon nano-tube film three electrode sensor array detection mixed gas concentrations; The hardware configuration that this mixed gas concentration measuring method requires is simple, and any mixed gas of energy measurement adopts data anastomosing algorithm, detects mixed gas accuracy height.
The objective of the invention is to realize by following technical proposals.
Carbon nano-tube three electrode sensors, it is characterized in that: comprise three first electrode, second electrode and third electrodes that distribute successively from top to bottom, the electrode that described first electrode is bonded with the substrate of the carbon nano-tube film that distributing by inside surface and is provided with bleeder vent constitutes; Second electrode is made of the extraction pole pole plate that the center is provided with fairlead; Third electrode is made of the collector that the plate face is provided with blind hole; These three electrodes are isolated mutually by insulation column respectively.
Architectural feature of the present invention also is:
The die opening of adjacent two electrodes is 30～250 μ m in described three electrodes; Described first electrode and second electrode pad are 0.01～17mm over against area
2, second electrode and third electrode pole plate are 0.01～190mm over against area
2
The bleeder vent of the electrode surface of described first electrode is 1～4, is attached with carbon nano-tube film in the bonding substrate of electrode inner surface;
The described second electrode extraction pole center is provided with 1～4 fairlead;
Described third electrode collector blind hole is corresponding with the fairlead of second electrode, and the quantity of blind hole is 1～4.
The present invention gives a kind of method based on carbon nano-tube film three electrode sensor array detection mixed gas concentrations, and this method comprises the steps:
(1) selecting the die opening of adjacent two electrodes of three electrodes is carbon nano-tube film three electrode sensors of 30～250 μ m;
(2) according to the component gases quantity in the mixed gas to be measured, carbon nano-tube film three electrode sensors that to set the different poles spacing respectively place mixed gas to be measured, and simultaneously the carbon nano-tube film three electrode temperature sensors and the humidity sensor of two different poles spacings placed gas to be measured, form sensor array by all the sensors;
(3) be 0V to the carbon nano-tube film three electrode mixed gas each component sensors of step (2) three-electrode structure, the first electrode on-load voltage of temperature and humidity sensor respectively, the second electrode on-load voltage, 2～200V, third electrode on-load voltage 1～180V;
(4) in mixed gas each component concentration to be measured, temperature and humidity measurement range, corresponding different concentration, temperature and humidity calibration value, the gas discharge ion flow valuve of all the sensors output in the measuring process (2) respectively;
(5) with all the sensors output ion flow valuve that in concentration, temperature, moisture measurement scope, records in the step (4), with corresponding mixed gas each component concentration, the scale of thermometer and humidity demarcating value, form different experimental calibration samples, adopt the piecewise interpolation technology that the experimental calibration sample is carried out interpolation then, obtain interpolated data, obtain interpolated sample, and set up the mixed gas concentration measured database according to all samples that comprised experimental calibration sample and interpolated sample;
(6) adopt the data fusion technology, make up the data fusion instrument, set up the measurement model of hybrid gas sensor, temperature sensor and humidity sensor; With input sample and the desired output sample of the data in the mixed gas concentration measured database as the data fusion instrument, and train and check as the training sample and the test samples of data fusion instrument respectively with data different in the range ability, when assay satisfies the measurement error requirement, the accurate measurement model of mixed gas concentration of data fusion instrument output transducer array;
The accurate measurement model of mixed gas concentration that the ion flow valuve input step (6) of output obtains during (7) with carbon nano-tube film three electrode sensor arrays, temperature sensor and humidity sensor actual measurement, the accurate measured value of this model output mixed gas each component concentration.
The inventive method feature also is:
In carbon nano-tube film three electrode sensors of described three-electrode structure, second electrode potential is higher than first electrode potential, and the third electrode current potential is lower than second electrode potential and is higher than first electrode potential.
The described mixed gas concentration measured database of setting up, be that experimental calibration data and interpolated data are formed database, with the ion flow valuve of each sensor output in the sensor array and interpolated data thereof as the input sample, with each component concentration, temperature and humidity calibration value and interpolated data thereof in the mixed gas as the desired output sample.
Based on the method for carbon nano-tube film three electrode sensor array detection mixed gas concentrations, form sensor array by different poles spacing carbon nano-tube film three electrode sensors, measure mixed gas each component concentration to be measured, temperature and humidity respectively; Power by the sensor electrical potential source; Export by pA level current measurement system detecting sensor; Adjust electrode separation, adjust electrode voltage, in mixed gas to be measured, in temperature, humidity environment, carry out the calibration experiment of sensor; Based on the piecewise interpolation technology experimental calibration data are carried out interpolation, obtain interpolated data; All data that will comprise experimental calibration data and interpolated data are formed the mixed gas concentration measured database, and the acquisition sensor array is listed in monodrome gas-sensitive property, monodrome responsive to temperature characteristic, the monodrome humidity sensitive characteristic in the mixed gas to be measured; According to the data in the mixed gas concentration measured database, based on the data fusion technology, eliminate the influence of temperature, humidity, set up the accurate measurement model of mixed gas concentration of sensor array; The mixed gas concentration measurement model is imported in the output of sensor array in real time during with actual measurement, just can obtain the measured result of mixed gas each component concentration.This mixed gas concentration measuring method has overcome the many-valued nonlinear problem of carbon nano-tube film two electrode sensor gas-sensitive properties and wet quick characteristic, the hardware configuration that requires is simple, any mixed gas of energy measurement, and cost is low, detected gas is highly sensitive, accuracy is high, is suitable for promoting the use of.
Mixed gas concentration detection method of the present invention, the carbon nano-tube film three electrode sensor array techniques of employing different poles spacing under the condition of not separating mixed gas, can realize that the concentration of mixed gas is accurately measured, accuracy is 1%.The concentration detection method of tradition three electrode probes that use in this novel mixed gas concentration detection method and the existing ionization detector chromatograph is compared, because the employing carbon nano-tube film is done electrode and adopt the sensor of different poles spacing to form array, respective sensor in the array all has the measurement of concetration accuracy of high sensitivity and 1% to the each component in the mixed gas, therefore both avoided in the measuring process adopting for example process of chromatographic column separating mixed gas of equipment for separation of gases, having overcome chromatograph again need be at the difficult problem of gas with various component replacing variety classes detector.And carbon nano-tube film three electrode sensors can be realized working sensor voltage with the tip curvature radius of carbon nanotube level, from the safe and practical scope below 600 volts of high pressure drop to 200 volts of ionization detector.Novel mixed gas concentration measuring method of the present invention integrates sensor array technology, pA level current measurement techniques, piecewise interpolation technology and the data fusion technology of different poles spacing, do not need separating mixed gas, the influence of temperature, humidity can be eliminated, the accurate measurement of each component concentration in the mixed gas can be realized.
Description of drawings
Fig. 1 is carbon nano-tube thin film cathode two electrode sensor structural representations.
Fig. 2 is the voltage breakdown of prior art carbon nano-tube film two-electrode gas sensor and the many-valued non-linear gas-sensitive property of gas concentration.
Fig. 3 is the breakdown current of prior art carbon nano-tube film two-electrode gas sensor and the non-linear many-valued gas-sensitive property of gas concentration.
Fig. 4 is carbon nano-tube film three electrode sensor structural representations of the present invention.
Fig. 5 is carbon nano-tube film three electrode sensor spatial structure side views of the present invention.
Fig. 6 is the single valued relation of carbon nano-tube film three electrode sensor array detection sulphuric dioxide of the present invention and nitrogen monoxide two component mixed gas concentrations.
Among the figure: 1, first electrode; 2, second electrode; 3, third electrode; The electrode that 4, bleeder vent is arranged; 5, carbon nano-tube film substrate; 6, carbon nano-tube film; 7, insulation column.
Embodiment
The present invention will be further described below in conjunction with drawings and the specific embodiments.
As Fig. 4, shown in Figure 5, these carbon nano-tube film three electrode sensors, comprise by three successively from top to bottom the electrode of mutual superposition constitute, these three mutual superposition electrodes are respectively equipped with first electrode 1, second electrode 2 and third electrode 3, and the electrode 4 that described first electrode 1 is bonded with the substrate 5 of the carbon nano-tube film 6 that distributing by inside surface and is provided with bleeder vent constitutes; Second electrode 2 is made of the extraction pole pole plate that the center is provided with fairlead; Third electrode 3 is made of the collector that the battery lead plate face is provided with blind hole; These three electrodes are isolated mutually by insulation column 7 respectively.
Among the embodiment of carbon nano-tube film three electrode sensor array detection two component mixed gas concentrations shown in Figure 6, the bleeder vent of the electrode surface of used sensor first electrode 1 has 2, and bleeder vent is circular; Side surface at this bleeder vent is bonded with carbon nano-tube film substrate 5, is distributed with carbon nano-tube film 6 on it, and this carbon nano-tube mouth of pipe is downward.Second electrode, 2 centers are provided with 1 fairlead and fairlead is circular embodiment.Third electrode 3 collector blind holes are corresponding with the fairlead of second electrode, provided among Fig. 4, Fig. 5 a blind hole to be set and blind hole is the embodiment of cylindrical structure.Insulation column 7 is separately positioned between the carbon nano-tube film substrate 5 and second electrode 2, between second electrode 2 and the third electrode 3, promptly insulation column 7 is distributed in second electrode 2 over against the surperficial both sides at the carbon nano-tube film substrate two ends of first electrode 1 and the both sides of the inner surface of third electrode 3.
The present invention is provided with the electrode 4 plate faces and the carbon nano-tube film substrate 5 of bleeder vent and all adopts silicon sheet material to make; Described carbon nano-tube film 6 can adopt FePC as catalyzer, and adopts carbon source, and carbon nano-tube film 6 is made in growth in substrate 5, and perhaps the serigraphy carbon nano-tube film 6.Second electrode 2 and third electrode 3 all adopt silicon wafer to manufacture.The two sides that are provided with the electrode 4 of bleeder vent and third electrode 3 medial surfaces, second electrode 2 are equipped with metal film.
On the electrode in the present invention's first electrode 12 bleeder vents are arranged, be convenient to gas to be detected and enter electrode gap; Have conductive capability at the bottom of the silicon wafer-based of carbon nano-tube film, and strong bond is at the first electrode inner surface; Through the fairlead of second electrode 2, third electrode 3 collectors can be collected the positive ion stream that gas ionization produces.Between first electrode 1 and second electrode 3, isolate mutually by insulation column 7 between second electrode 2 and the third electrode 3; Tested gas enters in the gap of adjacent two electrodes of sensor by the gap between the sensor peripheral electrode.
Below by an instantiation, the method for carbon nano-tube film three electrode sensor array detection mixed gas concentrations of the present invention is described further.
Adopt carbon nano-tube film three electrode temperatures, the humidity sensor of two different poles spacing carbon nano-tube film three electrode gas concentration sensors, two different poles spacings to form sensor array, experiment has obtained the monodrome gas-sensitive property (shown in Figure 6) of two component mixed gass, two component mixed gas concentration measurement models that the ion flow data input data fusion of sensor output is set up have obtained accuracy less than 1% two component mixed gas concentration measured values.
Among the gas discharge ion flow that SO 2 sensor in the carbon nano-tube film three electrode sensor arrays shown in Figure 6 and nitric oxide sensor are exported in sulphuric dioxide and nitrogen monoxide two component mixed gass and the embodiment of two component gases concentration, the experimental situation condition is 22.0 ℃ of temperature, relative humidity 25.6%RH, atmospheric pressure 93.4KPa.Top-surface camber is the monodrome characteristic of nitric oxide sensor among Fig. 6, and lower surface camber is the monodrome characteristic of SO 2 sensor.First electrode 1 of nitric oxide sensor and second electrode 2, second electrode 2 are 150 μ m with third electrode 3 die openings, and SO 2 sensor first electrode 1 and second electrode 2, second electrode 2 are 180 μ m with third electrode 3 die openings; The die opening of the carbon nano-tube film three electrode sensor adjacent electrodes that monitor temperature is used is 170 μ m; The die opening of the carbon nano-tube film three electrode sensor adjacent electrodes that monitoring humidity is used is respectively 200 μ m, 100 μ m.First electrode 1 of above-mentioned carbon nano-tube film three electrode sensors and second electrode, 2 pole plates are 17mm over against area
2, second electrode 2 is 190mm with third electrode 3 pole plates over against area
2Two first electrode, 1 cathode voltages of measuring mixed gas component concentration sensor are 0V, the equal on-load voltage 100V of second electrode, 2 extraction poles, the equal on-load voltage 10V of third electrode 3 collectors; Temperature sensor first, second, third electrode voltage is respectively 0V, 70V, 10V; Humidity sensor first, second, third electrode voltage is respectively 0V, 90V, 10V.Along with SO
2With the rising of NO gas concentration, the ion flow that the sensor collector of two measure gas concentrations is collected all reduces, and ion flow presents the relation that monodrome descends with two kinds of gas concentration increases; Temperature, humidity sensor sensing characteristic and gas sensor are similar.At SO
2In gas 0～741.051ppm concentration range and in the concentration range of NO gas 0～1127.46ppm, 25 groups of experimental calibration data have been obtained.Four sensor ion flow valuves are as the input sample, and two component gases concentration calibration values are as the desired output sample data.Adopt two-dimentional curved section linear interpolation, at SO
2In gas 0～741.051ppm concentration range and in the concentration range of NO gas 0～1127.46ppm, 25 groups of experimental calibration sample datas are carried out interpolation, obtain 1645 groups of interpolated datas altogether, and form database with 25 groups of experimental calibration data; Select for use 1621 groups of interpolated datas as training sample, remain 24 groups of interpolated datas that are different from training sample and 25 groups of experimental calibration data and 1 group as the interpolated data of training sample totally 50 groups of concentration demand values (being the gas concentration critical value) data as test samples, input data fusion instrument, by the training check, obtain SO
2, NO two component mixed gas concentration measurement models.This model SO
2Component measurement of concetration result's the linearity is that the assay fiducial error maximal value of 0.38%, 50 group of test samples is 0.46%; NO component measurement of concetration result's the linearity is that the assay fiducial error maximal value of 0.18%, 50 group of test samples is 0.23%, has reached 1% measurement of concetration accuracy.
Present embodiment basic structure is with embodiment 1, different is: three carbon nano-tube film three electrode sensors of employing different poles spacing are measured the concentration of three components in the three component mixed gass, the die opening of adjacent two electrodes is identical in three electrodes of each sensor, the die opening of three sensors is respectively 250 μ m, 150 μ m, 30 μ m, and first electrode 1 and second electrode, 2 pole plates are 0.01mm over against area
2, second electrode 2 is 0.01mm with third electrode 3 pole plates over against area
2
The bleeder vent of the electrode surface of sensor first electrode 1 has 1, and bleeder vent is quadrilateral, pentagon or hexagon; Second electrode, 2 center fairleads are 4, and fairlead is quadrilateral, pentagon or hexagon; The quantity of third electrode 3 blind holes is 4, and blind hole is 3～6 prisms or pyramid.
The detection method of present embodiment is substantially the same manner as Example 1, and different is:
Three carbon nano-tube film three electrode sensors of employing different poles spacing detect the gas concentration of three different components in the three component mixed gass, the first electrode cathode voltage of three sensors is 0V, the second electrode extraction pole on-load voltage 2V, third electrode collector on-load voltage 1V.The ion flow valuve of output is imported the accurate measurement model of three component mixed gas concentrations during with carbon nano-tube film three electrode sensor arrays, temperature sensor and humidity sensor actual measurement, and this model is exported the accurate measured value of three component mixed gas each component concentration.
Present embodiment basic structure is with embodiment 1, different is: adopt four carbon nano-tube film three electrode sensors of different poles spacing to form sensor array, adjacent two interelectrode die openings are identical in three electrodes of each sensor, the die opening of four sensors is respectively 250 μ m, 150 μ m, 100 μ m, 30 μ m, and first electrode 1 and second electrode, 2 pole plates are 10mm over against area
2, second electrode 2 is 100mm with third electrode 3 pole plates over against area
2
The bleeder vent of the electrode surface of sensor first electrode 1 has 4, and bleeder vent is quadrilateral, pentagon or hexagon; Second electrode, 2 center fairleads are 2, and fairlead is quadrilateral, pentagon or hexagon; The quantity of third electrode 3 blind holes is 2, and blind hole is 3～6 prisms or pyramid.
The detection method of present embodiment is substantially the same manner as Example 1, and different is:
Four carbon nano-tube film three electrode sensors of employing different poles spacing detect the gas concentration of four different components of four component mixed gass, the first electrode cathode voltage of sensor is 0V, the second electrode extraction pole on-load voltage 200V, third electrode collector on-load voltage 180V.The ion flow valuve of output is imported the accurate measurement model of four component mixed gas concentrations during with carbon nano-tube film three electrode sensor arrays, temperature sensor and humidity sensor actual measurement, and this model is exported the accurate measured value of four component mixed gas each component concentration.
Carbon nano-tube film three electrode sensors of the present invention by the different poles spacing are formed sensor array, the output of pA level current measurement system detecting sensor, piecewise interpolation and data fusion method, form a kind of novel, can measure various mixing gas to be measured, antijamming capability by force, does not need to separate mixed gas to be measured, the high mixed gas concentration measuring method of accuracy.The sensor of different poles spacing in the sensor array directly detects the each component concentration in the mixed gas under not separating the mixed gas condition, and the disturbing effect of detected temperatures, humidity in real time; PA level current measurement system can detect the pA level electric current of each sensor output of corresponding each component gas concentration, temperature and humidity simultaneously; Piecewise interpolation and data fusion method can be eliminated temperature, humidity interference, the high mixed gas concentration measured value of output accuracy.
Though the present invention has made detailed description with above-mentioned preferred embodiment to the present invention, the foregoing description also is not used in qualification the present invention.Under the situation that does not break away from given technical characterictic of technical solution of the present invention and range of structures, the increase that technical characterictic is done, distortion or with the replacement of the same content in this area all should belong to protection scope of the present invention.
Claims (6)
1. carbon nano-tube film three electrode sensors, it is characterized in that: comprise three first electrode, second electrode and third electrodes that distribute successively from top to bottom, the electrode that described first electrode is bonded with the substrate of the carbon nano-tube film that distributing by inside surface and is provided with bleeder vent constitutes; Second electrode is made of the extraction pole pole plate that the center is provided with fairlead; Third electrode is made of the collector that the plate face is provided with blind hole; These three electrodes are isolated mutually by insulation column respectively.
2. carbon nano-tube film three electrode sensors according to claim 1 is characterized in that: the die opening of adjacent two electrodes is 30～250 μ m in described three electrodes; Described first electrode and second electrode pad are 0.01～17mm over against area
2, second electrode and third electrode pole plate are 0.01～190mm over against area
2
3. carbon nano-tube film three electrode sensors according to claim 1 is characterized in that: the bleeder vent of the electrode surface of described first electrode is 1～4, is attached with carbon nano-tube film in the bonding substrate of electrode inner surface;
The described second electrode extraction pole center is provided with 1～4 fairlead;
Described third electrode collector blind hole is corresponding with the fairlead of second electrode, and the quantity of blind hole is 1～4.
4. based on the method for carbon nano-tube film three electrode sensor array detection mixed gas concentrations, it is characterized in that this method comprises the steps:
(1) selecting the die opening of adjacent two electrodes of three electrodes is carbon nano-tube film three electrode sensors of 30～250 μ m;
(2) according to the component gases quantity in the mixed gas to be measured, carbon nano-tube film three electrode sensors that to set the different poles spacing respectively place mixed gas to be measured, and simultaneously the carbon nano-tube film three electrode temperature sensors and the humidity sensor of two different poles spacings placed gas to be measured, form sensor array by all the sensors;
(3) be 0V to the carbon nano-tube film three electrode mixed gas each component sensors of step (2) three-electrode structure, the first electrode on-load voltage of temperature and humidity sensor respectively, the second electrode on-load voltage, 2～200V, third electrode on-load voltage 1～180V;
(4) in mixed gas each component concentration to be measured, temperature and humidity measurement range, corresponding different concentration, temperature and humidity calibration value, the gas discharge ion flow valuve of all the sensors output in the measuring process (2) respectively;
(5) with all the sensors output ion flow valuve that in concentration, temperature, moisture measurement scope, records in the step (4), with corresponding mixed gas each component concentration, the scale of thermometer and humidity demarcating value, form different experimental calibration samples, adopt the piecewise interpolation technology that the experimental calibration sample is carried out interpolation then, obtain interpolated data, obtain interpolated sample, and set up the mixed gas concentration measured database according to all samples that comprised experimental calibration sample and interpolated sample;
(6) adopt the data fusion technology, make up the data fusion instrument, set up the measurement model of hybrid gas sensor, temperature sensor and humidity sensor; With input sample and the desired output sample of the data in the mixed gas concentration measured database as the data fusion instrument, and train and check as the training sample and the test samples of data fusion instrument respectively with data different in the range ability, when assay satisfies the measurement error requirement, the accurate measurement model of mixed gas concentration of data fusion instrument output transducer array;
The accurate measurement model of mixed gas concentration that the ion flow valuve input step (6) of output obtains during (7) with carbon nano-tube film three electrode sensor arrays, temperature sensor and humidity sensor actual measurement, the accurate measured value of this model output mixed gas each component concentration.
5. the method based on carbon nano-tube film three electrode sensor array detection mixed gas concentrations according to claim 4, it is characterized in that: in carbon nano-tube film three electrode sensors of described three electrode structures, second electrode potential is higher than first electrode potential, and the third electrode current potential is lower than second electrode potential and is higher than first electrode potential.
6. the method based on carbon nano-tube film three electrode sensor array detection mixed gas concentrations according to claim 4, it is characterized in that: the described mixed gas concentration measured database of setting up, be that experimental calibration data and interpolated data are formed database, with the ion flow valuve of each sensor output in the sensor array and interpolated data thereof as the input sample, with each component concentration, temperature and humidity calibration value and interpolated data thereof in the mixed gas as the desired output sample.
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| CN102175343A (en) * | 2011-02-16 | 2011-09-07 | 西安交通大学 | Carbon nanotube film three-electrode gas temperature sensor and temperature measuring method thereof |
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| CN106248776A (en) * | 2016-08-03 | 2016-12-21 | 西安交通大学 | A kind of sensor array detecting many components mixed gas |
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