CN114002378A - Concentration detection method of gas concentration sensor - Google Patents
Concentration detection method of gas concentration sensor Download PDFInfo
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Abstract
The invention discloses a concentration detection method of a gas concentration sensor, which comprises the steps of obtaining a theoretical coefficient table N of the gas concentration sensor; calibrating the actual measurement sensor; and (4) detecting the concentration of the gas A with unknown concentration by using an actual measurement sensor. The method adopts the theoretical sensors to obtain a response voltage absolute value table, constructs a theoretical coefficient table N, calibrates each actual measurement sensor independently to obtain independent DV sequences of each sensor, and measures unknown concentration by using the own DV sequences of the actual measurement sensors. Based on the method of the invention, the DV sequence is updated quickly and is matched and corresponding to the actually measured sensor, so that the calibration of the gas sensor becomes simpler, the production process of the product is greatly optimized, the calibration requirement of the user on-site use is reduced, necessary technical guarantee is provided for improving the accuracy, reliability and maintainability of the product of the gas detector, and the full-range deviation is less than 0.5 percent and is far higher than the national standard.
Description
Technical Field
The present disclosure relates to concentration detection, and particularly to a concentration detection method for a gas concentration sensor.
Background
In the gas alarm industry, gas sensors are used to detect the real-time concentration of a target gas. The gas sensor may be of a semiconductor type, a catalytic combustion type, an electrochemical type, an infrared type, a photoion type, a laser type, or the like. The function is as follows: the gas detector sends out an alarm signal when the gas concentration in the environment reaches or exceeds a preset alarm value, and related equipment is linked, so that the effects of safety early warning and life and property safety protection are achieved.
The basic principle of gas sensor for detecting gas concentration is as follows: when the gas sensor works normally, the electric response value of the current/voltage of the gas sensor has a certain incidence relation with the target gas detected in the environment, the response value is converted into a voltage change signal which can be identified by the MCU through a hardware circuit, and a certain algorithm is applied to obtain the accurate concentration value of the target gas in the environment.
Currently, the commonly used methods for calculating the gas concentration are classified into the following types:
1. a one-dimensional linear function method, which is calculated using the formula Y ═ AX + B, where X: the sensor detects voltage value variable, Y is the concentration value obtained by calculation, A: slope coefficient of voltage value and concentration value, B: and a density correction coefficient. The unitary linear function is used, the calibration is simple, the alarm point can be directly calibrated, the detection alarm value is accurate, and the high-end concentration deviation is larger in the full-range of the gas sensor.
2. By using a unitary quadratic function method, the deviation of the concentration value calculated in the full-scale range of the gas sensor is small, but the alarm point is difficult to calibrate directly, two points which are distributed uniformly in a relative mode are taken in the full-scale range for calibration except for the zero point, so that the alarm point has large deviation, and the calibration is complex and difficult.
Therefore, whether a unitary linear function or a unitary quadratic function is used to calculate the gas concentration value, the deviation occurs in the whole range, and is inevitable.
Disclosure of Invention
The invention aims to solve the problems, and the concentration detection method of the gas concentration sensor is high in speed, simple in settlement and accurate in result by adopting a simple calibration method to calibrate and measure an actual measurement sensor, so that deviation in a full-range is avoided.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a concentration detection method of a gas concentration sensor includes the following steps;
(1) acquiring a theoretical coefficient table N of the gas concentration sensor, comprising the steps (11) to (15);
(11) for a batch of gas concentration sensors of the same type, one of the gas concentration sensors is taken as a theoretical sensor, and the other sensors are actually measured sensors, so that the response voltage value V of the theoretical sensor in the air is obtained0；
(12) Determining a gas A and the concentration range of the gas A, selecting S different concentration values in the full range, and sequentially marking as B1-BSObtaining theoretical sensor at B1-BSCorresponding response voltage value V1-VSWherein the ith concentration value is marked as Bi，i＝1，2，…，S；
(13) By formula DVi＝Vi-V0Calculating theoretical sensor in B1-BSCorresponding absolute value DV of response voltage1-DVSIn which B isiThe corresponding absolute value of the response voltage is marked DVi(ii) a Will DViConstructing a response voltage absolute value table according to the sequence of concentration values from small to large;
(14) in B1-BSA value is selected as a reference point M, and the corresponding response voltage value of the reference point M is VMCorresponding absolute value of response voltage is DVMFor DV1-DVSAccording to formula N, respectivelyi＝DVi/DVMCalculating to obtain the theoretical sensor corresponding to B1-BSCoefficient N of1-NSWherein the theoretical sensor corresponds to BiCoefficient of (1) is Ni；
(15) All N areiSequencing the concentration values from small to large to construct a theoretical coefficient table N;
N＝{N1，N2，…，Ni…，NS}；
(2) a measured sensor calibration comprising steps (21) - (25);
(21) taking an actual measurement sensor, taking two calibration points P0 and P1, wherein P0 is air environment, and P1 is B in gas A1-BsAny value of (d);
(22) measuring the response voltage value V of the measured sensor in P0P0Response voltage value V in P1P1And according to formula DVP1＝VP1-VP0And calculating the absolute value DV of the response voltage of the measured sensor in P1P1；
(23) In the theoretical coefficient table N, the coefficient corresponding to P1 is found, and is marked as NPAccording to formula DV'M＝DVP1/NPCalculating the absolute value DV 'of the response voltage of the actually measured sensor at the reference point M'M；
(24) Will DV'MAnd each N of the theoretical coefficient tables NiAccording to formula DV'i＝DV’M×NiCalculating the actual measurement sensor at B1-BSOf (d) corresponding absolute value of response voltage DV'1-DV’SAnd forming the DV sequence of the actual measurement sensor;
DV sequence ═ DV'1，DV’2，…，DV’i…，DV’S}
(25) Repeating the steps (21) - (24) to obtain DV sequences corresponding to all actually measured sensors;
(3) the actual measurement sensor detects the concentration of the gas A with unknown concentration; comprising steps (31) - (33);
(31) selecting a calibrated actual measurement sensor, and placing the sensor in a position with unknown concentration of CtIn the gas A environment, the response voltage value V of the actual measurement sensor is obtainedtAnd according to the formula dVt＝Vt-VP0Calculating the measured sensor at CtAbsolute value dV of response voltaget；
(32) To dVtSearching in DV sequence corresponding to actual measurement sensor to find DVtTwo adjacent values, respectively denoted dV00And dV11And dV00＜dVt＜dV11Looking up dV from the table of absolute values of the response voltage00And dV11Corresponding concentration value, marked C00And C11；
(33) The concentration C was calculated according to the following formulat；
Ct＝(dVt-dV00)/((dV11-dV00)/(C11-C00))+C00。
Preferably, the method comprises the following steps: the gas concentration sensor includes a semiconductor type, a catalytic combustion type, an electrochemical type, an infrared type, a photo-ionic type, or a laser type.
The formula of the invention is as follows:
DVi＝Vi-V0 (1)
Ni＝DVi/DVM (2)
DVP1＝VP1-VP0 (3)
DV’M＝DVP1/NP (4)
DV’i＝DV’M×Ni (5)
in combination with the formula, we illustrate the basic idea of the present invention as follows:
(1) firstly, a plurality of gas concentration sensors of the same type are divided into theoretical sensors and actual measurement sensors, the theoretical sensors are measured in the full range of concentration, and a response voltage absolute value DV is correspondingly obtained according to different concentrations of a formula (1)iAnd constructing a response voltage absolute value table, selecting a reference point M, and obtaining a theoretical coefficient table N corresponding to the theoretical sensor by using a formula (2). This step is mostly done in the laboratory. The theoretical coefficient table N is actually written into other measured sensors of the same type. However, for the actual measurement sensors, due to individual differences, there is a small amount of deviation in their data, that is, any actual measurement sensor is used as a theoretical sensor, and the theoretical coefficient table N obtained in step (1) of the present invention actually has slight differences, and these differences result in deviation of the test results of the actual measurement sensors, and in order to avoid the deviation of the actual measurement sensors, we need to calibrate the actual measurement sensors.
(2) The actual measurement sensor is calibrated, and in the invention, the actual measurement sensor is calibratedDuring calibration, the actual measurement sensor is required to be actually measured in the environments of two calibration points P0 and P1, and the absolute value DV of the response voltage of the actual measurement sensor in P1 is obtained by combining the formula (3)P1(ii) a Calculating the absolute value DV 'of the response voltage of the actual measurement sensor at the reference point M by using a formula (4)'M(ii) a Here DV'MIs calculated, associated with the measured sensor, and the DV of the theoretical sensor in equation (2)MDifferent. Then, using the formula (5), DV 'corresponding to the actual measurement sensor'MMultiplying with a theoretical coefficient table to obtain the measured sensor B1-BSOf (d) corresponding absolute value of response voltage DV'1-DV’SEquation (5) and equation (2) are inverse operations, and equation (5) is the combination of the theoretical coefficient table and the actual DV'MAnd inversely calculating the actual measurement sensor B1-BSOf (d) corresponding absolute value of response voltage DV'1-DV’SObtaining DV sequences corresponding to all actually measured sensors; through the step, the method is equivalent to quickly obtaining the B position of each measured sensor1-BSCorresponding to the absolute value of the response voltage. We refer to this as a DV sequence.
(3) And (4) calculating the concentration of the gas A with unknown concentration according to a formula by using the calibrated actual measurement sensor to obtain an accurate concentration value.
Compared with the prior art, the invention has the advantages that:
obtaining a response voltage absolute value table by adopting a theoretical sensor; establishing a theoretical coefficient table N by using a response voltage absolute value table, independently calibrating each actually measured sensor, and using a response voltage absolute value DV in a calibration point P1P1And (3) calculating a response voltage absolute value table of the actual measurement sensor, namely the DV sequence in the step (2), and measuring the unknown concentration by using the DV sequence of the actual measurement sensor. Based on the method, the DV sequence is updated quickly and is matched and corresponding to the actually measured sensor, so that the calibration of the gas sensor becomes simpler, the production process of the product is greatly optimized, the calibration requirement of the user on-site use is reduced, and necessary technical guarantee is provided for improving the accuracy, reliability and maintainability of the gas detector product.
Based on the method, the gas detection concentration can be accurately calculated within the effective range of the gas sensor, and the full-range deviation is less than 0.5 percent and is far higher than 5 percent of the national standard. In addition, the number of the points taken by the theoretical coefficient table N is not limited, and the more the points are taken, the more the points are accurate.
Drawings
FIG. 1 is a flow chart of step (1) of the present invention;
FIG. 2 is a flow chart of step (2) of the present invention;
FIG. 3 is a flow chart of step (3) of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
Example 1: referring to fig. 1 to 3, a concentration detection method of a gas concentration sensor includes the steps of;
(1) acquiring a theoretical coefficient table N of the gas concentration sensor, comprising the steps (11) to (15);
(11) for a batch of gas concentration sensors of the same type, one of the gas concentration sensors is taken as a theoretical sensor, and the other sensors are actually measured sensors, so that the response voltage value V of the theoretical sensor in the air is obtained0；
(12) Determining a gas A and the concentration range of the gas A, selecting S different concentration values in the full range, and sequentially marking as B1-BSObtaining theoretical sensor at B1-BSCorresponding response voltage value V1-VSWherein the ith concentration value is marked as Bi，i＝1，2，…，S；
(13) By formula DVi＝Vi-V0Calculating theoretical sensor in B1-BSCorresponding absolute value DV of response voltage1-DVSIn which B isiThe corresponding absolute value of the response voltage is marked DVi(ii) a Will DViConstructing a response voltage absolute value table according to the sequence of concentration values from small to large;
(14) in B1-BSA value is selected as a reference point M, and the corresponding response voltage value of the reference point M is VMCorresponding absolute value of response voltage is DVMFor DV1-DVSAccording to formula N, respectivelyi＝DVi/DVMCalculating to obtain the theoretical sensor corresponding to B1-BSCoefficient N of1-NSWherein the theoretical sensor corresponds to BiCoefficient of (1) is Ni；
(15) All N areiSequencing the concentration values from small to large to construct a theoretical coefficient table N;
N＝{N1，N2，…，Ni…，NS}；
(2) a measured sensor calibration comprising steps (21) - (25);
(21) taking an actual measurement sensor, taking two calibration points P0 and P1, wherein P0 is air environment, and P1 is B in gas A1-BsAny value of (d);
(22) measuring the response voltage value V of the measured sensor in P0P0Response voltage value V in P1P1And according to formula DVP1＝VP1-VP0And calculating the absolute value DV of the response voltage of the measured sensor in P1P1；
(23) In the theoretical coefficient table N, the coefficient corresponding to P1 is found, and is marked as NPAccording to formula DV'M＝DVP1/NPCalculating the absolute value DV 'of the response voltage of the actually measured sensor at the reference point M'M；
(24) Will DV'MAnd each N of the theoretical coefficient tables NiAccording to formula DV'i＝DV’M×NiCalculating the actual measurement sensor at B1-BSOf (d) corresponding absolute value of response voltage DV'1-DV’SAnd forming the DV sequence of the actual measurement sensor;
DV sequence ═ DV'1，DV’2，…，DV’i…，DV’S}
(25) Repeating the steps (21) - (24) to obtain DV sequences corresponding to all actually measured sensors;
(3) the actual measurement sensor detects the concentration of the gas A with unknown concentration; comprising steps (31) - (33);
(31) selecting a calibrated actual measurement sensor, and placing the sensor in a position with unknown concentration of CtIn the gas A environment, the response voltage value V of the actual measurement sensor is obtainedtAnd according to the formula dVt＝Vt-VP0Calculating the measured sensor at CtAbsolute value dV of response voltaget；
(32) To dVtSearching in DV sequence corresponding to actual measurement sensor to find DVtTwo adjacent values, respectively denoted dV00And dV11And dV00＜dVt＜dV11Looking up dV from the table of absolute values of the response voltage00And dV11Corresponding concentration value, marked C00And C11；
(33) The concentration C was calculated according to the following formulat；
Ct＝(dVt-dV00)/((dV11-dV00)/(C11-C00))+C00。
The gas concentration sensor includes a semiconductor type, a catalytic combustion type, an electrochemical type, an infrared type, a photo-ionic type, or a laser type.
Example 2: referring to fig. 1 to 3, the method of the present invention is adopted to select a gas concentration sensor, and the method of the present invention for detecting the concentration of the gas concentration sensor is adopted to measure methane gas, wherein the concentration range is 0-100 LEL%, and the method comprises the following steps;
(1) acquiring a theoretical coefficient table N of the gas concentration sensor;
(11) in the same step (11) of the embodiment 1, a theoretical sensor and a measured sensor are distinguished, and the response voltage value V of the theoretical sensor in the air is obtained0477 MV; at this point, the concentration of gas A can be considered to be 0 LEL%;
(12) determining that the gas A in the embodiment is methane, the concentration range is 0-100 LEL%, selecting 10 different concentration values S in the full range, and sequentially marking as B1-B10See table 1, column 1, below. B is1-B10Corresponding concentration valueRespectively as follows: 10 LEL%, 20 LEL%, 30 LEL%, 40 LEL%, 50 LEL%, 60 LEL%, 70 LEL%, 80 LEL%, 90 LEL%, 100 LEL%, see Table 1, column 2, below. Obtaining theoretical sensor at B1-BSCorresponding response voltage value V1-V10See table 1, column 3, below;
(13) calculation of theoretical sensor in B1-B10Corresponding absolute value DV of response voltage1-DV10；
For B1，DV1＝V1-V0＝634-477＝157；
For B2，DV2＝V2-V0＝783-477＝306；
For B5，DV5＝V5-V0＝1200-477＝723；
By analogy with the method, we can obtain DV1-DV10See table 1, column 4, below;
(14) select B5As reference point M, DVM＝DV5；
For N1，N1＝DV1/DV5＝157/723＝0.21715；
For N2，N2＝DV2/DV5＝306/723＝0.42324；
Similarly, by analogy with the above method, we can obtain N1-N10See table 1, column 5, below;
table 1: a measured data table of the theoretical sensor in the methane gas;
(15) all N areiSequencing the concentration values from small to large to construct a theoretical coefficient table N;
N＝{N1，N2，…，Ni…，NS}；
in fact, the fifth column of table 1 is the theoretical coefficient table N of the present invention.
Before step (2) is performed, in order to better illustrate the calibration accuracy of the present invention, we first calculate the concentration of methane gas of unknown concentration by using the theoretical sensor in step (1) according to the method of steps (2) and (3) of the present invention. The steps are the same as the steps (2) and (3) in the embodiment 1, except that the theoretical sensor is applied to the actual gas environment and is used as the actual measurement sensor, and the specific steps are as follows:
(2) calibrating the measured sensor, in this embodiment, calibrating the theoretical sensor in step (1), including steps (21) - (25);
(21) two calibration points P0 and P1 are taken, P0 is air environment, P1 is B2＝20LEL％；
(22) Response voltage value V of theoretical sensor in P0P0477MV, response voltage value V in P1P1783MV, according to the formula DVP1＝VP1-VP0，DVP1＝783MV-477MV＝306MV；
(23) In the theoretical coefficient table N, P1 corresponds to NP0.42324, according to formula DV'M＝DVP1/NPTo give DV'M＝306MV/0.42324＝723MV；
(24) Will DV'M723MV, and each N of the theoretical coefficient Table NiAccording to formula DV'i＝DV’M×NiCalculating the actual measurement sensor at B1-BSOf (d) corresponding absolute value of response voltage DV'1-DV’SAnd forming the DV sequence of the actual measurement sensor; the sequence data is identical to the third column of Table 1.
(3) The theoretical sensor in the step (1) detects the concentration of the methane gas with unknown concentration; comprising steps (31) - (33);
(31) putting the theoretical sensor at unknown concentration CtIn the methane gas, the response voltage value V of the actual measurement sensor is obtainedt999MV and calculating dV according to the formulat＝Vt-VP0＝999MV-477MV＝522MV；
(32) Will dVt522MV, look up in DV sequence,this embodiment can look up in Table 1 to find dVtTwo adjacent values are respectively B3Corresponding 450, and B4Corresponding 590, then 450 is marked dV00Corresponding concentration value B330 LEL%, 590 mark dV11Corresponding concentration value B440 LEL%; according to formula Ct＝(dVt-dV00)/((dV11-dV00)/(C11-C00))+C00(ii) a C obtained by final calculationt＝35.14285714。
In this example, the concentration C measured by the theoretical sensort＝35.14285714。
Example 3: to better illustrate the effect of the invention, we base on B in example 21-B10The theoretical sensor in example 2 is labeled as number 1, and 7 gas concentration sensors of the same type as the theoretical sensor are selected and labeled as numbers 2 to 8, and the calculation is performed through the following steps:
the first step is as follows: respectively obtaining respective theoretical coefficient tables of eight sensors according to the step (1) of the invention;
first acquire all sensors in air environment, and B1-B10Corresponding response voltage value V in methane gas with concentration1-V10To obtain the following table 2;
table 2: table for measured response voltage value of all sensors in methane gas with different concentration
In table 2, for the measured sensor 1, the measured response voltage value in the air environment is 452, so its corresponding DV1＝593-452＝141，DV2728-.
TABLE 3 Absolute value Table of response voltages calculated by all sensors according to TABLE 2
The 8 sensors are all B5Taking 50 LEL% as a reference point M, and respectively using 8 sensors according to a formula Ni＝DVi(DV) calculating the coefficient N1-N10Obtaining respective theoretical coefficient tables N of all the sensors as shown in the following table 4;
table 4: theoretical coefficient table of all sensors
Through the steps, the actually measured response voltage values, the response voltage absolute values, the coefficients and the coefficient tables of the eight sensors in the methane gas with different concentrations are obtained.
The second step is that: taking No. 1 as a theoretical sensor and taking No. 2-7 as actual measurement sensors, and respectively calibrating the actual measurement sensors;
(21) taking the sensor No. 2, and taking two calibration points P0 and P1, wherein P0 is the air environment, and P1 is B2；
(22) Response voltage value V of No. 2 sensor in P0P0452MV, response voltage value V in P1P1＝V2728MV, the specific data from table 2 above, then DVP1＝VP1-VP0＝276MV；
(23) In the theoretical coefficient table N of sensor No. 1, P1 corresponds to NP0.420731707, according to formula DV'M＝DVP1/NPTo give DV'M＝276MV/0.423237≈656MV；
(24) Will DV'M656MV, and each N of theoretical coefficient table N for sensor No. 1iAccording to formula DV'i＝DV’M×NiCalculating to obtain a DV sequence of the number 2 sensor;
(25) repeating the steps (21) to (24) to obtain DV sequences corresponding to all measured sensors, for example:
DV’1＝656MV×N1＝656MV×0.217150761＝142.450899MV；
DV’2＝656MV×N2＝656MV×0.423236515＝277.6431535；
by analogy, the DV sequence of sensor No. 2 is calculated, see table 5 below, for a row of data corresponding to sensor No. 2. And obtaining DV sequences of sensors No. 3-8 according to the method.
Table 5: DV sequence table corresponding to all sensors
Here, according to DV'MAnd N of theoretical sensoriThe method for calculating the DV sequence of the sensor, which we call backward calculation, and the method for calculating the absolute value DV of the response voltage from the measured data, which we call forward calculation, are shown in tables 1, 2 and 3. To illustrate the effect of the invention, we compare tables 3 and 5, i.e. the difference between the backward and forward calculations in 8 sensors, to obtain table 6:
TABLE 6 Difference Table between inverse calculation and Forward calculation
The third step: we verify the technical effects of the invention:
a methane gas environment is selected, and the methane gas environment is firstly measured by a No. 1 sensor, so that the concentration of the methane gas in the environment is 35 LEL%. Placing the No. 2-8 sensors in the gas environment respectively, measuring according to the step (3) of the invention to obtain corresponding concentration values respectively, and calculating the deviation value between the concentration of the No. 2-8 sensors and the concentration of the No. 1 sensor to obtain a table 7:
table 7: table of concentrations and deviations measured by all sensors in 35 LEL% methane gas
As can be seen from Table 7, the gas concentration value calculated by the method of the present invention has the advantages of high speed, high precision and very small deviation within the whole range, which is only a few thousandths.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (2)
1. A concentration detection method of a gas concentration sensor is characterized in that: comprises the following steps;
(1) acquiring a theoretical coefficient table N of the gas concentration sensor, comprising the steps (11) to (15);
(11) for a batch of gas concentration sensors of the same type, one of the gas concentration sensors is taken as a theoretical sensor, and the other sensors are actually measured sensors, so that the response voltage value V of the theoretical sensor in the air is obtained0；
(12) Determining a gas A and the concentration range of the gas A, selecting S different concentration values in the full range, and sequentially marking as B1-BSObtaining theoretical sensor at B1-BSCorresponding response voltage value V1-VSWherein the ith concentration value is marked as Bi，i＝1，2，…，S；
(13) By formula DVi＝Vi-V0Calculating theoretical sensor in B1-BSCorresponding absolute value DV of response voltage1-DVSIn which B isiThe corresponding absolute value of the response voltage is marked DVi(ii) a Will DViConstructing a response voltage absolute value table according to the sequence of concentration values from small to large;
(14) in B1-BSOptionally, a value is selected as a reference point M, and the reference point M corresponds to a response electrodePressure value of VMCorresponding absolute value of response voltage is DVMFor DV1-DVSAccording to formula N, respectivelyi＝DVi/DVMCalculating to obtain the theoretical sensor corresponding to B1-BSCoefficient N of1-NSWherein the theoretical sensor corresponds to BiCoefficient of (1) is Ni；
(15) All N areiSequencing the concentration values from small to large to construct a theoretical coefficient table N;
N＝{N1，N2，…，Ni…，NS}；
(2) a measured sensor calibration comprising steps (21) - (25);
(21) taking an actual measurement sensor, taking two calibration points P0 and P1, wherein P0 is air environment, and P1 is B in gas A1-BsAny value of (d);
(22) measuring the response voltage value V of the measured sensor in P0P0Response voltage value V in P1P1And according to formula DVP1＝VP1-VP0And calculating the absolute value DV of the response voltage of the measured sensor in P1P1；
(23) In the theoretical coefficient table N, the coefficient corresponding to P1 is found, and is marked as NPAccording to formula DV'M＝DVP1/NPCalculating the absolute value DV 'of the response voltage of the actually measured sensor at the reference point M'M；
(24) Will DV'MAnd each N of the theoretical coefficient tables NiAccording to formula DV'i＝DV’M×NiCalculating the actual measurement sensor at B1-BSOf (d) corresponding absolute value of response voltage DV'1-DV’SAnd forming the DV sequence of the actual measurement sensor;
DV sequence ═ DV'1，DV’2，…，DV’i…，DV’S}
(25) Repeating the steps (21) - (24) to obtain DV sequences corresponding to all actually measured sensors;
(3) the actual measurement sensor detects the concentration of the gas A with unknown concentration; comprising steps (31) - (33);
(31) selecting a calibrated actual measurement sensor, and placing the sensor in a position with unknown concentration of CtIn the gas A environment, the response voltage value V of the actual measurement sensor is obtainedtAnd according to the formula dVt＝Vt-VP0Calculating the measured sensor at CtAbsolute value dV of response voltaget；
(32) To dVtSearching in DV sequence corresponding to actual measurement sensor to find DVtTwo adjacent values, respectively denoted dV00And dV11And dV00＜dVt＜dV11Looking up dV from the table of absolute values of the response voltage00And dV11Corresponding concentration value, marked C00And C11；
(33) The concentration C was calculated according to the following formulat；
Ct＝(dVt-dV00)/((dV11-dV00)/(C11-C00))+C00。
2. The concentration detection method of a gas concentration sensor according to claim 1, characterized in that: the gas concentration sensor includes a semiconductor type, a catalytic combustion type, an electrochemical type, an infrared type, a photo-ionic type, or a laser type.
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