CN112198209A - Formaldehyde detection method and formaldehyde detection device - Google Patents
Formaldehyde detection method and formaldehyde detection device Download PDFInfo
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- CN112198209A CN112198209A CN201910545880.3A CN201910545880A CN112198209A CN 112198209 A CN112198209 A CN 112198209A CN 201910545880 A CN201910545880 A CN 201910545880A CN 112198209 A CN112198209 A CN 112198209A
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- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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Abstract
The invention relates to a formaldehyde detection method, which comprises the following steps: acquiring detection data of two formaldehyde sensors with different reaction strengths on interference components in the same environment; and comparing the detection data of the two formaldehyde sensors, judging whether the interference gas exists or not, and calculating the formaldehyde concentration value in the environment according to the detection data of the two formaldehyde sensors. In the formaldehyde detection method, the detection data of the two formaldehyde sensors are obviously different when the interference components appear, so that the interference condition of detecting the formaldehyde can be effectively judged, and more accurate formaldehyde detection values can be calculated and obtained. The invention also relates to a formaldehyde detection device, which comprises a controller, a first formaldehyde sensor and a second formaldehyde sensor, wherein the first formaldehyde sensor and the second formaldehyde sensor have different reaction strengths of interference components, and are respectively and electrically connected with the controller.
Description
Technical Field
The invention relates to a formaldehyde detection method and a formaldehyde detection device.
Background
Along with the improvement of environmental awareness and the attention on health of people, the formaldehyde detection is more and more applied. The formaldehyde sensor that uses in the existing market adopts the electrochemistry principle to detect more, then receives easily in the testing process the interference of other gas composition such as toilet water, alcohol, perfume, and then influences the output value of formaldehyde sensor.
Chinese patent application publication No. CN109781809A (application No. 201910134605.2) discloses an artificial intelligence method for measuring and calculating formaldehyde concentration, wherein the method for measuring and calculating formaldehyde concentration includes steps of respectively measuring multiple sets of formaldehyde concentration values by a chemical analysis method and a spectrophotometry method, respectively measuring ambient temperature and humidity corresponding to each set of formaldehyde concentration value by a temperature and humidity sensor, performing comparison training by an artificial neural network, predicting and verifying formaldehyde values by a ReLU function to obtain corresponding mathematical models, and finally inputting initial values of formaldehyde concentration, field temperature and field humidity measured by an electrochemical detection method as variables into the mathematical models to calculate formaldehyde evaluation values. In the method, when the mathematical model is established in the early stage, a relatively accurate model can be established only by adopting a large amount of data, and two methods are required for testing, so that the experiment is long in time consumption and high in cost. In addition, during calculation, whether the interference exists in the calculation of the formaldehyde content cannot be accurately judged, and the accuracy of the calculation result is relatively low.
Chinese patent application publication No. CN109655518A (application No. 201910139233.2) discloses a formaldehyde electrochemical sensing detection device, a calibration method, and a purifier, wherein the calibration method of the formaldehyde electrochemical sensing detection device obtains parameter values of interference factors, actual values of formaldehyde concentration, and detected values of formaldehyde concentration in environments with different interference factors; performing parameter fitting according to the parameter value of the interference factor, the actual formaldehyde concentration value and the detected formaldehyde concentration value to obtain compensation coefficients corresponding to different interference factors; the obtained compensation coefficient is used for calibrating the formaldehyde concentration detection value, so that the sensitivity of the response output of the current sensor to environmental parameters is effectively improved, the influence of environmental parameter difference on the detection response output result is avoided, and the real concentration of formaldehyde in the environment is effectively displayed by an air purification product or other formaldehyde removal concentration display devices. However, the method also has the aforementioned problems that a large amount of experimental data is needed to calibrate the compensation coefficient, the required experimental data is large in amount, the experiment takes long time, the cost is high, only estimation can be performed during calculation, the accuracy of the output value of the formaldehyde content cannot be judged, and meanwhile, judgment on whether the interference condition exists cannot be given.
Disclosure of Invention
The first technical problem to be solved by the present invention is to provide a method for detecting formaldehyde, which can directly determine whether there is interfering gas and can output a more accurate result of formaldehyde content.
The second technical problem to be solved by the present invention is to provide a formaldehyde detecting device with simple detection, low cost and accurate output result, which can judge the interference situation.
The technical scheme adopted by the invention for solving the first technical problem is as follows: a formaldehyde detection method is characterized in that: the method comprises the following steps:
acquiring detection data of two formaldehyde sensors with different reaction strengths on interference components in the same environment;
and comparing the detection data of the two formaldehyde sensors, judging whether the interference gas exists or not, and calculating the formaldehyde concentration value in the environment according to the detection data of the two formaldehyde sensors.
The condition of gas change in the environment can be better judged according to difference change of detection data of the two formaldehyde sensors, and a data set A (A) consisting of N detection data continuously acquired by the first formaldehyde sensor is acquired in real time0,A1,A2,……,Ai,……,AN]Wherein i and N are natural numbers, and i is more than or equal to 0 and less than or equal to N, calculating and acquiring a variation data set B which is corresponding to the data set A and is [ B ═ B%0,B1,B2,……,Bi,……,BN-1]In which B isi＝Ai+1-AiFitting calculation at the latest detection data A at the same timeNChange slope K of detection data in previous time T1；
At the same sampling time point, a second sampling time point is obtainedData group C (C) formed by N detection data continuously acquired by formaldehyde sensors0,C1,C2,……,Ci,……,CN]Calculating and acquiring a variable quantity data set D ═ D corresponding to the data set C0,D1,D2,……,Di,……,DN-1]Wherein D isi＝Ci+1-CiFitting calculation at the latest detection data C at the same timeNChange slope K of detection data in previous time T2；
Comparing the data sets A and C, comparing the data in the variation data sets B and D, and simultaneously comparing K1And K2And judging whether the interference gas exists according to the comparison result, and calculating the content of the formaldehyde by using the data groups A and C according to the comparison result.
Preferably, the first formaldehyde sensor has a reaction intensity of F1 for the interfering component and the second formaldehyde sensor has a reaction intensity of F2, F1 ═ KF2, where K > 1;
counting and calculating the positive increment number and the negative increment number Y1 in the variation data group B; statistically calculating the positive increment number X2 and the negative increment number Y2 in the variation data group D;
state 1: if 0. ltoreq. X1-Y1. ltoreq.M, 0. ltoreq. X2-Y2. ltoreq.M, and 0. ltoreq. Bi|≤Z，0≤|DiIf the absolute value is less than or equal to Z, judging that the component gas influencing the detection data of the formaldehyde sensor is not increased basically in the environment; wherein M > 0, M representing a fluctuation threshold; z is greater than 0 and represents a fault judgment threshold value;
state 2: if the absolute value of X1-Y1 is more than or equal to M, the absolute value of X2-Y2 is more than or equal to M, X1 is more than Y1, and X2 is more than Y2, judging that the measuring gas influencing the detection data components of the formaldehyde sensor appears in the environment;
in the case of State 2, K is compared1And K2Further judging whether the measurement gas has interference gas interfering the formaldehyde detection;
state 3: if | X1-Y1| ≧ M, | X2-Y2| ≧ M, and X1 < Y1, X2 < Y2, it is judged that the measurement gas in the environment that affects the detection data component of the formaldehyde sensor is decreasing.
Accurately, the method for judging whether the interfering gas interfering the formaldehyde detection appears in the environment comprises the following steps:
state 2.1: if 0 < K1/K2If the alpha is less than a, judging that gas interfering the formaldehyde detection does not appear in the environment, wherein the alpha is more than 0, and the alpha is a judgment threshold value for judging whether the interference exists;
state 2.2: if K is1/K2And a or more, judging that gas interfering the formaldehyde detection appears in the environment.
In order to better distinguish the interference degree of the interference gas to the formaldehyde gas, under the condition of the state 2.2, the judging method of the condition of the content of the formaldehyde gas and the content of the interference gas comprises the following steps:
state 2.2.1: if a is less than or equal to K1/K2If the measured gas content is less than b, judging that the content of the formaldehyde gas in the measured gas increased in the environment is greater than the content of the interference gas;
state 2.2.2: if b is less than or equal to K1/K2If so, judging that the content of the formaldehyde gas in the measurement gas increased in the environment is less than that of the interference gas;
state 2.2.3: if K is1/K2If the measured gas is more than or equal to c, judging that the measured gas increased in the environment is basically interference gas;
wherein a is more than b and less than c, and b and c are judgment threshold values for judging different content conditions of the formaldehyde gas and the interference gas.
If state 3 subsequently occurs on the basis of state 2.2.2 or state 2.2.3Q times in succession, and Ai＞CiAnd judging that the formaldehyde sensor has a fault.
Accurately, the calculation method of the formaldehyde concentration in the current environment under the condition of the state 2.2 is as follows:
formaldehyde concentration value in current environment in states 2.2.1 and 2.2.2
Under the condition of the state 2.2.3, the formaldehyde concentration value in the current environment is the corresponding output formaldehyde concentration value before the positive increment does not appear in the variation data group B, D;
the calculation method of the formaldehyde concentration in the current environment in the state 3 is as follows:
if the state 3 is subsequently presented on the basis of the state 1 or the state 2.1, the formaldehyde concentration value in the current environment
If the state 3 subsequently occurs on the basis of the state 2.2.1, in Ai≤CiThen the concentration value of formaldehyde in the current environment
In Ai＞CiThen the concentration value of formaldehyde in the current environment
If the state 3 subsequently occurs on the basis of the state 2.2.2, in Ai≤CiIf so, the formaldehyde concentration value in the current environment is the corresponding output formaldehyde concentration value before no negative increment occurs in the variation data group B, D; in Ai＞CiThen the concentration value of formaldehyde in the current environment
If the state 3 is subsequently presented on the basis of the state 2.2.3, the formaldehyde concentration value in the current environment is the corresponding formaldehyde concentration value to be outputted before the negative increment is not presented in the variation data group B, D.
Preferably, a > 1; under the condition of the state 2.1, the calculation method of the formaldehyde concentration in the current environment comprises the following steps:
when 0 < K1/K2When the concentration value is less than or equal to 1, the concentration value of formaldehyde in the current environment
When 1 < K1/K2When < a, whenConcentration value of formaldehyde in the front Environment
More precisely, the formaldehyde concentration value in the current environment in the case of State 1
In order to effectively judge the fault conditions of the two formaldehyde sensors, the state 4: in the case of 0. ltoreq. X1-Y1. ltoreq.M and 0. ltoreq. X2-Y2. ltoreq.M, if | Bi| is ≧ Z or | DiAnd if the state 4 appears for J times continuously, judging that the formaldehyde sensor has a fault.
The technical scheme adopted by the invention for solving the second technical problem is as follows: the utility model provides a formaldehyde detection device which characterized in that: the methanol synthesis system comprises a controller, a first formaldehyde sensor and a second formaldehyde sensor, wherein the first formaldehyde sensor and the second formaldehyde sensor are different in alcohol reaction strength, and are respectively and electrically connected with the controller.
Compared with the prior art, the invention has the advantages that: according to the formaldehyde detection method, the two formaldehyde sensors with different reaction strengths on the interference components are used for data detection, so that when the interference components appear, the detection data of the two formaldehyde sensors are obviously different, the interference condition of detecting the formaldehyde can be effectively judged, and on the basis, a more accurate formaldehyde concentration value can be calculated and obtained.
The formaldehyde detection device using the method only needs to be provided with the controller, the first formaldehyde sensor and the second formaldehyde sensor which have different reaction strengths on the interference components, and the structure is simple. When the formaldehyde concentration detector is used, the formaldehyde concentration in the environment can be accurately detected without special early-stage experiments, the early-stage experiments are low in cost, and the data processing amount in the working process is small.
Drawings
FIG. 1 is a flow chart of a formaldehyde detection method in an embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
In this embodiment, the formaldehyde detection method described below can be implemented by a simple formaldehyde detection device, which includes a controller, and a first formaldehyde sensor and a second formaldehyde sensor having different reaction strengths for interfering components, where the first formaldehyde sensor and the second formaldehyde sensor are electrically connected to the controller, respectively. When the formaldehyde concentration value output device works, the controller calculates according to detection data transmitted by the first formaldehyde sensor and the second formaldehyde sensor, and then outputs the formaldehyde concentration value in the environment.
The intensity of the reaction of the first formaldehyde sensor with the interfering component is F1, and the intensity of the reaction of the second formaldehyde sensor with the interfering component is F2, F1 ═ KF2, where K > 1. Interfering components may include benzene, toluene, acetic acid, alcohols, hydrogen sulfide, carbon monoxide, and the like. When two formaldehyde sensors are selected, formaldehyde sensor products with different reaction strengths on different interference components can be selected according to requirements. When the two formaldehyde sensors detect formaldehyde gas, the output values are kept consistent. And for the interference component, the output value of the first formaldehyde sensor is larger or far larger than that of the second formaldehyde sensor. Therefore, when the interference component occurs, the output value of the first formaldehyde sensor is more sensitive to change and fluctuates more.
As shown in fig. 1, the formaldehyde detection method specifically includes the following steps:
and S1, acquiring detection data of two formaldehyde sensors with different reaction strengths to the interference components in the same environment.
When the formaldehyde sampling device is used, the first formaldehyde sensor and the second formaldehyde sensor are arranged in the same environment, and the first formaldehyde sensor and the second formaldehyde sensor are synchronously sampled according to the same time point and time period.
Acquiring a data group A ═ A [ A ] formed by N detection data continuously acquired by a first formaldehyde sensor in real time0,A1,A2,……,Ai,……,AN]Wherein i and N are natural numbers, and 0. ltoreq. i.ltoreq.N, wherein ANThe latest data collected for the first formaldehyde sensor, and A0,A1,A2,……,Ai,……,AN-1Is ANAnd acquiring the acquired detection data at the previous N-1 sampling time points.
Acquiring a data group C ═ C composed of N detection data continuously acquired by a second formaldehyde sensor at the same sampling time point as that of the first formaldehyde sensor0,C1,C2,……,Ci,……,CN]。
S2, comparing the detection data of the two formaldehyde sensors, judging whether the interference gas exists or not, and calculating the formaldehyde concentration value in the environment according to the detection data of the two formaldehyde sensors.
Calculating and acquiring a variation data set B ═ B corresponding to the data set A0,B1,B2,……,Bi,……,BN-1]In which B isi＝Ai+1-AiFitting calculation at the latest detection data A at the same timeNChange slope K of detection data in previous time T1. Calculating and acquiring a variable quantity data set D ═ D corresponding to the data set C0,D1,D2,……,Di,……,DN-1]Wherein D isi＝Ci+1-CiFitting calculation at the latest detection data C at the same timeNChange slope K of detection data in previous time T2。
The time T is specifically set as required, and for example, the time T is the time for acquiring 3N data. Namely with a comprisingN、CNThe nearby 3N detection data are respectively subjected to K1、K2The fitting calculation algorithm can adopt various existing fitting algorithms, for example, the least square method can be adopted for K1、K2The fitting calculation of (1).
In this embodiment, the data groups a and C are compared, the data in the variation data groups B and D are compared, and K is compared at the same time1And K2And judging whether the interference gas exists according to the comparison result, and calculating the content of the formaldehyde by using the data groups A and C according to the comparison result.
Counting and calculating the positive increment number and the negative increment number Y1 in the variation data group B; the number of positive increments X2 and the number of negative increments Y2 in the variation data group D are statistically calculated.
Based on the above data, the judgment of the disturbance condition and the accurate calculation of the formaldehyde concentration are performed by the following condition conditions.
State 1: if 0. ltoreq. X1-Y1. ltoreq.M, 0. ltoreq. X2-Y2. ltoreq.M, and 0. ltoreq. Bi|≤Z，0≤|DiIf the | is less than or equal to Z, judging that the component gas influencing the detection data of the formaldehyde sensor is not basically added in the environment, namely the formaldehyde gas and the interference gas are not basically added in the environment; wherein M > 0, M representing a fluctuation threshold; and Z is more than 0 and represents a fault judgment threshold value, namely if the difference between the detection values obtained by two adjacent sampling points of the formaldehyde sensor is too large, whether the formaldehyde sensor has a fault needs to be further determined, if the difference between the detection values obtained by two adjacent sampling points is not large, the normal fluctuation of the detection data is output, and at the moment, the formaldehyde sensor is judged to be in a normal working state. Under the condition of the state 1, namely if the formaldehyde gas and the interference gas do not appear in the current environment, the detection data of the second formaldehyde sensor with certain anti-interference capability on the interference component is used for calculating to be closer to the formaldehyde concentration value in the environment, and then the formaldehyde concentration value in the current environment
State 2: if | X1-Y1| ≧ M, | X2-Y2| ≧ M, and X1 > Y1, X2 > Y2, then judge that the measuring gas that influences formaldehyde sensor detection data composition appears in the environment, whether the specific measuring gas has interference gas and need further confirmation. In the case of state 2, K can be compared1And K2And judging whether the measurement gas has interference gas interfering the formaldehyde detection.
The method for judging whether the interfering gas interfering the formaldehyde detection appears in the environment comprises the following steps:
state 2.1: if 0 < K1/K2If < a, judging that formaldehyde gas appears in the environment and basically no interference formaldehyde detection appearsAnd (3) detecting the interference gas, wherein a is more than 0, and a is a judgment threshold value for judging whether the interference exists. In the embodiment, a is more than 1, and specific a is 2.
Under the condition of the state 2.1, the data acquired by the formaldehyde sensor with the smaller detection value change slope is closer to the real concentration value of formaldehyde, and the calculation method of the formaldehyde concentration in the current environment comprises the following steps:
when 0 < K1/K2When the concentration value is less than or equal to 1, the concentration value of formaldehyde in the current environment
When 1 < K1/K2When the concentration is less than a, the concentration value of formaldehyde in the current environment
State 2.2: if K is1/K2And a or more, judging that gas interfering the formaldehyde detection appears in the environment.
In the case of the state 2.2, the method for judging the content of the formaldehyde gas and the content of the interference gas is as follows:
state 2.2.1: if a is less than or equal to K1/K2If the measured gas content is less than b, judging that the content of the formaldehyde gas in the measured gas increased in the environment is greater than the content of the interference gas;
state 2.2.2: if b is less than or equal to K1/K2If so, judging that the content of the formaldehyde gas in the measurement gas increased in the environment is less than that of the interference gas;
formaldehyde concentration value in current environment in states 2.2.1 and 2.2.2
That is, in the case of the states 2.2.1 and 2.2.2, the calculation result is more accurate by increasing the weight value of the detection data of the formaldehyde sensor having a small reaction intensity with respect to the interfering gas to calculate the formaldehyde concentration.
Status of state2.2.3: if K is1/K2If the measured gas is more than or equal to c, judging that the measured gas increased in the environment is basically interference gas; in the state of state 2.2.3, the formaldehyde concentration value in the current environment is the formaldehyde concentration value that is output by the controller before the positive increment does not appear in the variation data group B, D, and the output value of the first formaldehyde sensor or the second formaldehyde sensor is adopted as the formaldehyde concentration value as required.
Wherein a < b < c, b and c are judgment thresholds for judging different contents of the formaldehyde gas and the interference gas, in the embodiment, b is 4, and c is 10.
State 3: if | X1-Y1| ≧ M, | X2-Y2| ≧ M, and X1 < Y1, X2 < Y2, it is judged that the measurement gas in the environment that affects the detection data component of the formaldehyde sensor is decreasing.
The calculation method of the formaldehyde concentration in the current environment in the state 3 is as follows:
if the state 3 appears subsequently on the basis of the state 1 or the state 2.1, namely the situation that the detection values of the first formaldehyde sensor and the second formaldehyde sensor are reduced on the basis of the environment without interfering the formaldehyde detection basically occurs, the detection data of the first formaldehyde sensor with higher reaction intensity of interfering components is adopted to calculate the formaldehyde concentration in the current environment, so that the data error caused by data output delay can be better avoided, the output formaldehyde concentration value is closer to the true formaldehyde concentration value in the environment, and the formaldehyde concentration value in the current environment is closer to the true formaldehyde concentration value in the environment
If the state 3 is subsequently presented on the basis of the state 2.2.1, namely, if the formaldehyde gas and the interference gas are presented simultaneously and the amount of the interference gas is small, the detection values of the first formaldehyde sensor and the second formaldehyde sensor are reduced, and the smaller detection values are closer to the real formaldehyde concentration value in the environment. Thus at Ai≤CiWhen the formaldehyde sensor responds to the condition of the measured gas content reduction in the environment more quickly, namely in the early period of the measured gas reduction, the second formaldehyde sensor responds to the condition of the measured gas content reduction in the environment more quicklyThe response speed of the sensor to the condition that the content of the measured gas in the environment is reduced is delayed, at the moment, the formaldehyde concentration data obtained by calculating the data detected by the first formaldehyde sensor is closer to the true value, and the formaldehyde concentration value in the current environment is
In Ai＞CiWhen the formaldehyde concentration is calculated by increasing the weight value of the detection data of the formaldehyde sensor with low reaction intensity on the interference gas, the calculation result is more accurate, and the formaldehyde concentration value in the current environment is more accurate
If the state 3 is subsequently presented on the basis of the state 2.2.2, namely, if the formaldehyde gas and the interference gas are presented at the same time and the amount of the interference gas is large, the detection values of the first formaldehyde sensor and the second formaldehyde sensor are reduced. In Ai≤CiWhen the formaldehyde concentration value in the current environment is the corresponding formaldehyde concentration value which is output before negative increment does not appear in the variable quantity data group B, D which is closer to the real value of the formaldehyde concentration in the environment, namely when the detection data just drop, because the response of the first formaldehyde sensor to the drop of the interference gas is obvious, and a larger error occurs when the detection data collected in real time are adopted for calculation, the formaldehyde concentration value in the current environment is the corresponding formaldehyde concentration value which is output before negative increment does not appear in the variable quantity data group B, D which is closer to the real value of the formaldehyde concentration in the environment, and the output value of the first formaldehyde sensor or the second formaldehyde sensor is adopted as the formaldehyde concentration value according. In Ai＞CiThe second formaldehyde sensor is subjected to a delayed output stage, the detection data of the second formaldehyde sensor is more accurate relative to the detection data of the first formaldehyde sensor, and the formaldehyde concentration value in the current environment is at the moment
If the state 3 is subsequently presented on the basis of the state 2.2.3, that is, if the detected data is reduced when the interfering gas is increased in the previous stage, it can be determined that the reduced value is the reduction of the detected data caused by the reduction of the interfering gas, and the formaldehyde concentration value in the current environment is the formaldehyde concentration value which is correspondingly output by the controller before the negative increment is not present in the variation data group B, D, so that the formaldehyde concentration value can be more approximate to the true value of the formaldehyde concentration in the environment, and the output value of the first formaldehyde sensor or the second formaldehyde sensor is adopted as the formaldehyde concentration value as required.
If state 3 subsequently occurs on the basis of state 2.2.2 or state 2.2.3Q times in succession, and Ai＞CiAnd judging that the formaldehyde sensor has a fault.
And 4: in the case of 0. ltoreq. X1-Y1. ltoreq.M and 0. ltoreq. X2-Y2. ltoreq.M, if | Bi| is ≧ Z or | DiAnd if the state 4 appears for P times continuously, judging that the formaldehyde sensor has a fault.
According to the formaldehyde detection method, the two formaldehyde sensors with different reaction strengths of the interference components are used for data detection, so that when the interference components appear, the detection data of the two formaldehyde sensors can have obvious difference, the interference condition of detecting the formaldehyde can be effectively judged, and on the basis, a more accurate formaldehyde detection value can be calculated and obtained.
Claims (11)
1. A formaldehyde detection method is characterized in that: the method comprises the following steps:
acquiring detection data of two formaldehyde sensors with different reaction strengths on interference components in the same environment;
and comparing the detection data of the two formaldehyde sensors, judging whether the interference gas exists or not, and calculating the formaldehyde concentration value in the environment according to the detection data of the two formaldehyde sensors.
2. According to claim 1The formaldehyde detection method is characterized by comprising the following steps: acquiring a data group A ═ A [ A ] formed by N detection data continuously acquired by a first formaldehyde sensor in real time0,A1,A2,……,Ai,……,AN]Wherein i and N are natural numbers, and i is more than or equal to 0 and less than or equal to N, calculating and acquiring a variation data set B which is corresponding to the data set A and is [ B ═ B%0,B1,B2,……,Bi,……,BN-1]In which B isi＝Ai+1-AiFitting calculation at the latest detection data A at the same timeNChange slope K of detection data in previous time T1；
Acquiring a data group C ═ C composed of N detection data continuously acquired by a second formaldehyde sensor at the same sampling time point0,C1,C2,……,Ci,……,CN]Calculating and acquiring a variable quantity data set D ═ D corresponding to the data set C0,D1,D2,……,Di,……,DN-1]Wherein D isi＝Ci+1-CiFitting calculation at the latest detection data C at the same timeNChange slope K of detection data in previous time T2；
Comparing the data sets A and C, comparing the data in the variation data sets B and D, and simultaneously comparing K1And K2And judging whether the interference gas exists according to the comparison result, and calculating the content of the formaldehyde by using the data groups A and C according to the comparison result.
3. The formaldehyde detection method according to claim 2, characterized in that: the reaction intensity of the first formaldehyde sensor to the interference component is F1, the reaction intensity of the second formaldehyde sensor to the interference component is F2, F1 is KF2, wherein K is more than 1;
counting and calculating the positive increment number and the negative increment number Y1 in the variation data group B; statistically calculating the positive increment number X2 and the negative increment number Y2 in the variation data group D;
state 1: if 0. ltoreq. X1-Y1. ltoreq.M, 0. ltoreq. X2-Y2. ltoreq.M, and 0. ltoreq. Bi|≤Z，0≤|DiIf the | is less than or equal to Z, judging that the influence in the environment is not increased basicallyDetecting component gas of data by a formaldehyde sensor; wherein M > 0, M representing a fluctuation threshold; z is greater than 0 and represents a fault judgment threshold value;
state 2: if the absolute value of X1-Y1 is more than or equal to M, the absolute value of X2-Y2 is more than or equal to M, X1 is more than Y1, and X2 is more than Y2, judging that the measuring gas influencing the detection data components of the formaldehyde sensor appears in the environment;
in the case of State 2, K is compared1And K2Further judging whether the measurement gas has interference gas interfering the formaldehyde detection;
state 3: if | X1-Y1| ≧ M, | X2-Y2| ≧ M, and X1 < Y1, X2 < Y2, it is judged that the measurement gas in the environment that affects the detection data component of the formaldehyde sensor is decreasing.
4. The formaldehyde detection method according to claim 3, characterized in that: the method for judging whether the interfering gas interfering the formaldehyde detection appears in the environment comprises the following steps:
state 2.1: if 0 < K1/K2If the alpha is less than a, judging that gas interfering the formaldehyde detection does not appear in the environment, wherein the alpha is more than 0, and the alpha is a judgment threshold value for judging whether the interference exists;
state 2.2: if K is1/K2And a or more, judging that gas interfering the formaldehyde detection appears in the environment.
5. The formaldehyde detection method according to claim 4, characterized in that: in the case of the state 2.2, the method for judging the content of the formaldehyde gas and the content of the interference gas is as follows:
state 2.2.1: if a is less than or equal to K1/K2If the measured gas content is less than b, judging that the content of the formaldehyde gas in the measured gas increased in the environment is greater than the content of the interference gas;
state 2.2.2: if b is less than or equal to K1/K2If so, judging that the content of the formaldehyde gas in the measurement gas increased in the environment is less than that of the interference gas;
state 2.2.3: if K is1/K2If the measured gas is more than or equal to c, judging that the measured gas increased in the environment is basically interference gas;
wherein a is more than b and less than c, and b and c are judgment threshold values for judging different content conditions of the formaldehyde gas and the interference gas.
6. The formaldehyde detection method according to claim 5, characterized in that: if state 3 subsequently occurs on the basis of state 2.2.2 or state 2.2.3Q times in succession, and Ai＞CiAnd judging that the formaldehyde sensor has a fault.
7. The formaldehyde detection method according to claim 5, characterized in that: the calculation method of the formaldehyde concentration in the current environment under the condition of the state 2.2 comprises the following steps:
formaldehyde concentration value in current environment in states 2.2.1 and 2.2.2
Under the condition of the state 2.2.3, the formaldehyde concentration value in the current environment is the corresponding output formaldehyde concentration value before the positive increment does not appear in the variation data group B, D;
the calculation method of the formaldehyde concentration in the current environment in the state 3 is as follows:
if the state 3 is subsequently presented on the basis of the state 1 or the state 2.1, the formaldehyde concentration value in the current environment
If the state 3 subsequently appears on the basis of the state 2.2.1, when Ai is less than or equal to Ci, the formaldehyde concentration value in the current environment
In Ai＞CiThen the concentration value of formaldehyde in the current environment
If the state 3 subsequently occurs on the basis of the state 2.2.2, in Ai≤CiIf so, the formaldehyde concentration value in the current environment is the corresponding output formaldehyde concentration value before no negative increment occurs in the variation data group B, D; in Ai＞CiThen the concentration value of formaldehyde in the current environment
If the state 3 is subsequently presented on the basis of the state 2.2.3, the formaldehyde concentration value in the current environment is the corresponding formaldehyde concentration value to be outputted before the negative increment is not presented in the variation data group B, D.
8. The formaldehyde detection method according to any one of claims 4 to 7, characterized in that: a is more than 1; under the condition of the state 2.1, the calculation method of the formaldehyde concentration in the current environment comprises the following steps:
when 0 < K1/K2When the concentration value is less than or equal to 1, the concentration value of formaldehyde in the current environment
When 1 < K1/K2When the concentration is less than a, the concentration value of formaldehyde in the current environment
9. The formaldehyde detection method according to any one of claims 4 to 7, characterized in that: formaldehyde concentration value in current environment under condition 1
10. The formaldehyde detection method according to any one of claims 3 to 7, characterized in that: and 4: m is more than or equal to 0 and less than or equal to X1-Y1And in the case of 0. ltoreq. X2-Y2. ltoreq.M, if Bi| is ≧ Z or | DiAnd if the state 4 appears for P times continuously, judging that the formaldehyde sensor has a fault.
11. The utility model provides a formaldehyde detection device which characterized in that: the formaldehyde sensor comprises a controller, a first formaldehyde sensor and a second formaldehyde sensor, wherein the first formaldehyde sensor and the second formaldehyde sensor are different in reaction strength of interference components, and the first formaldehyde sensor and the second formaldehyde sensor are respectively and electrically connected with the controller.
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