CN114740146A - Formaldehyde detection method and formaldehyde detection device - Google Patents
Formaldehyde detection method and formaldehyde detection device Download PDFInfo
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Abstract
The invention relates to a formaldehyde detection method, which comprises the steps of respectively obtaining detection data of a first formaldehyde sensor and a second formaldehyde sensor in the same environment, wherein the first formaldehyde sensor and the second formaldehyde sensor have different reaction strengths on interference components; the method comprises the steps that detection data of a first formaldehyde sensor and detection data of a second formaldehyde sensor are synchronously processed to obtain synchronization data V10 of the first formaldehyde sensor and synchronization data V20 of the second formaldehyde sensor, so that the change trends of the detection data of the first formaldehyde sensor and the second formaldehyde sensor at the same moment are kept consistent; and comparing the synchronous data variable quantities of the first formaldehyde sensor and the second formaldehyde sensor to judge whether the interference gas exists or not, and calculating the formaldehyde concentration value in the environment according to the judgment result of the interference gas and the synchronous data of the two formaldehyde sensors. The formaldehyde method has higher calculation accuracy. The invention also relates to a formaldehyde detection device applying the method.
Description
Technical Field
The invention relates to a formaldehyde detection method and a formaldehyde detection device.
Background
Along with the improvement of environmental protection consciousness and the attention of body health, 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. 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 needs a large amount of experimental data to calibrate the compensation coefficient, the required experimental data is large in amount, the experiment consumes 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, the judgment of 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 formaldehyde detection method, which can avoid the influence of interference gas on the formaldehyde content detection result, and can also avoid the large error of the formaldehyde content calculation result caused by the different response speeds of two formaldehyde sensors for anti-interference detection.
The second technical problem to be solved by the present invention is to provide a formaldehyde detecting device that is simple in detection, can reduce the influence of different response speeds of two formaldehyde sensors on the calculation result, and has low cost and more accurate output result.
The technical scheme adopted by the invention for solving the first technical problem is as follows: a formaldehyde detection method is characterized in that: respectively acquiring detection data of a first formaldehyde sensor and a second formaldehyde sensor in the same environment, wherein the first formaldehyde sensor and the second formaldehyde sensor have different reaction strengths on interference components;
the method comprises the steps that detection data of a first formaldehyde sensor and detection data of a second formaldehyde sensor are synchronously processed to obtain synchronization data V10 of the first formaldehyde sensor and synchronization data V20 of the second formaldehyde sensor, so that the change trends of the detection data of the first formaldehyde sensor and the second formaldehyde sensor at the same moment are kept consistent;
and comparing the synchronous data variable quantities of the first formaldehyde sensor and the second formaldehyde sensor to judge whether the interference gas exists or not, and calculating the formaldehyde concentration value in the environment according to the judgment result of the interference gas and the synchronous data of the two formaldehyde sensors.
More precisely, the detection data of the first formaldehyde sensor and the second formaldehyde sensor at the same change trend inflection point are respectively used as a first reference value V11 of the first formaldehyde sensor and a second reference value V22 of the second formaldehyde sensor;
v10 is compared to V11 to obtain a first formaldehyde sensor synchronized data variance, and V20 is compared to V22 to obtain a second formaldehyde sensor synchronized data variance.
Briefly, the first formaldehyde sensor has a reaction intensity of F1 for the interfering species and the second formaldehyde sensor has a reaction intensity of F2, F1 ═ KF2, where K > 1;
if the absolute value of V10-V11 is less than or equal to absolute value of K (V20-V22), judging that the content of aldehydes in the environment changes, otherwise, judging that only the content of the interference gas in the environment changes.
As an improvement, when the formaldehyde sensors with slow response speed in the first formaldehyde sensor and the second formaldehyde sensor have the same inflection point of the variation trend, the first reference value V11 of the first formaldehyde sensor and the second reference value V22 of the second formaldehyde sensor are updated,
while updating V11 and V22, taking the formaldehyde concentration value in the environment calculated at the moment as a formaldehyde concentration reference value P0 under the current variation trend;
when the aldehyde content in the environment is judged to be changed, calculating a real-time formaldehyde concentration value P in the environment;
P＝[K*(V20－V22)－(V10－V11)]/(K－1)+P0；
when the content of only the interference gas in the environment is judged to be changed, the real-time formaldehyde concentration value P in the environment is kept unchanged. The method for synchronously processing the detection data of the first formaldehyde sensor and the second formaldehyde sensor is as follows:
respectively storing a detection data group A of a first formaldehyde sensor and a detection data group B of a second formaldehyde sensor according to a first-in first-out principle;
A＝[A1,A2,……,Ai,……AN-1,AN]，B＝[B1,B2,……,Bi,……BN-1,BN]wherein i and N are natural numbers, i is more than or equal to 0 and less than or equal to N, and N is more than or equal to 3; a. theN、BNRespectively obtaining the current detection data of a first formaldehyde sensor and a second formaldehyde sensor;
if A isNTrend of change with respect to other data in data set A and BNThe trend is the same relative to other data in data group B, then V10 ═ aN，V20＝BN；
If A isNTrend of change with respect to other data in data set A and BNJudging that the response speeds of the first formaldehyde sensor and the second formaldehyde sensor are different when the change trends of other data in the data group B are inconsistent, and simultaneously comparing and judging the response speed of the first formaldehyde sensor and the response speed of the second formaldehyde sensor;
if the response speed of the first formaldehyde sensor is higher than that of the second formaldehyde sensor, V10 is made to be AN＝AN-1While V20 ═ BN(ii) a If the first formaldehyde sensor has a slower response speed than the second formaldehyde sensor, then V10 ═ ANSimultaneously, let V20 be BN＝BN-1。
Simply, the method for synchronizing the detection data under the condition that the response speeds of the first formaldehyde sensor and the second formaldehyde sensor are different comprises the following steps:
s202, judging the change trend of the data detected by the first formaldehyde sensor according to the data in the data group A, and judging the change trend of the second formaldehyde sensor according to the data group B;
s203, if the data in the data group A is changed from the non-ascending trend to the ascending trend, carrying out S204; otherwise, go to S206;
s204, if the data in the data group B continuously decrease, judging that the response speed of the first formaldehyde sensor is higher than that of the second formaldehyde sensor, and enabling V10 to be AN＝AN-1Go to S209; otherwise, go to S205;
s205, if the data in the data group B is changed from a non-ascending trend to a constant trend, judging that the response speed of the first formaldehyde sensor is higher than that of the second formaldehyde sensor, and enabling V10 to be equal to AN＝AN-1Performing S209;
s206, if the data in the data group A is changed from the non-descending trend to the descending trend, the step S207 is carried out; otherwise, performing S209;
s207, if the data in the data group B continuously rise, judging that the response speed of the first formaldehyde sensor is higher than that of the second formaldehyde sensor, and enabling V10 to be equal to AN＝AN-1Go to S209; otherwise, go to S208;
s208, if the data in the data group B are changed from a non-descending trend to a constant trend, judging that the response speed of the first formaldehyde sensor is higher than that of the second formaldehyde sensor, and enabling V10 to be AN＝AN-1Go to S209;
s209, if the data in the data group B is changed from the non-ascending trend to the ascending trend, carrying out S210; otherwise, go to S212;
s210, if the data in the data group A continuously decrease, judging that the response speed of the second formaldehyde sensor is higher than that of the first formaldehyde sensor, and enabling V20 to be BN＝BN-1(ii) a Otherwise, go to S211;
s211, if the data in the data group A is changed from the non-ascending trend to the constant trend, judging that the response speed of the second formaldehyde sensor is higher than that of the first formaldehyde sensor, and enabling V20 to be equal to BN＝BN-1；
S212, if the data in the data group B is changed from the non-descending trend to the descending trend, performing S213;
s213, if the data in the data group A continuously rise, judging that the response speed of the second formaldehyde sensor is higher than that of the first formaldehyde sensor, and enabling V20 to be BN＝BN-1(ii) a Otherwise, go to S214;
s214, if the data in the data set A is changed from the non-descending trend to the constant trend, judging that the response speed of the second formaldehyde sensor is higher than that of the first formaldehyde sensor, and enabling V20 to be equal to BN＝BN-1。
The technical scheme adopted by the invention for solving the second technical problem is as follows: a formaldehyde detection device applying the method is 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 have different reaction strengths of interference components, and the first formaldehyde sensor and the second formaldehyde sensor are electrically connected with the controller respectively.
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 interference condition of detecting the formaldehyde can be effectively judged according to the difference of the detection data variation of the two formaldehyde sensors, and on the basis, a more accurate formaldehyde concentration value can be calculated and obtained. Meanwhile, when the detected data variation is calculated, the influence of the response speed of the two formaldehyde sensors on the real-time performance of the data is considered, and then the detected data variation trends of the two formaldehyde sensors are kept consistent through the synchronization processing of the detected data of the two formaldehyde sensors, so that the error when the detected data variation of the two formaldehyde sensors is compared is reduced, the calculated change trend of the formaldehyde concentration in the environment is correct and the error is small when the formaldehyde concentration is greatly changed, and the calculation of the formaldehyde concentration in the environment is more accurate when the formaldehyde concentration is stable.
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.
Fig. 2 is a flowchart of a method for synchronizing detection data of the first formaldehyde sensor and the second formaldehyde sensor according to an embodiment of the present 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 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. 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. Generally, a certain reaction time is required for data detection of the formaldehyde sensor, and different formaldehyde sensors have different reaction times, which also causes the difference of response speed. The formaldehyde detection method in the embodiment can reduce the error caused by the influence on the speed when the two formaldehyde sensors detect the formaldehyde concentration value in the environment, and improve the accuracy of the detection of the formaldehyde concentration value in the environment.
The formaldehyde detection method in this embodiment includes the following steps.
And S1, acquiring detection data of a first formaldehyde sensor and a second formaldehyde sensor with different reaction strengths to the interference components in the same environment.
S2, carrying out synchronization processing on the detection data of the first formaldehyde sensor and the second formaldehyde sensor in real time to obtain the synchronization data V10 of the first formaldehyde sensor and the synchronization data V20 of the second formaldehyde sensor, so that the change trends of the detection data of the first formaldehyde sensor and the second formaldehyde sensor at the same time are kept consistent, and the obtained V10 and V20 are applied to the calculation of formaldehyde concentration values in the environment.
The method for synchronously processing the detection data of the first formaldehyde sensor and the second formaldehyde sensor specifically comprises the following steps:
s201, respectively storing a detection data group A of a first formaldehyde sensor and a detection data group B of a second formaldehyde sensor according to a first-in first-out principle;
wherein A ═ A1,A2,……,Ai,……AN-1,AN]，B＝[B1,B2,……,Bi,……BN-1,BN]Wherein i and N are natural numbers, i is more than or equal to 0 and less than or equal to N, and N is more than or equal to 3; a. theN、BNRespectively obtaining current detection data of a first formaldehyde sensor and a second formaldehyde sensor;
s202, judging the change trend of the data detected by the first formaldehyde sensor according to the data in the data group A, and judging the change trend of the second formaldehyde sensor according to the data group B;
the change trend of the detection data comprises rising, keeping unchanged and falling. For convenience of expression, ascending and remaining unchanged are non-descending, and remaining unchanged and descending are both non-ascending;
if A isNTrend of change with respect to other data in data set A and BNWhen the trend of the data obtained by the first formaldehyde sensor and the trend of the data obtained by the second formaldehyde sensor are changed at the same time, relative to the other data in the data group B, the trend of the data obtained by the first formaldehyde sensor is the same as the trend of the data obtained by the second formaldehyde sensor, and V10 is equal to AN，V20＝BN；
If A isNTrend of change with respect to other data in data set A and BNAnd if the change trends of other data in the data group B are not consistent, judging that the response speeds of the first formaldehyde sensor and the second formaldehyde sensor are different, and simultaneously performing comparison judgment on the response speed of the first formaldehyde sensor and the response speed of the second formaldehyde sensor, specifically as follows:
s203, if the data in the data group A is changed from the non-ascending trend to the ascending trend, carrying out S204; otherwise, go to S206; the data in the data group A is changed from the non-ascending trend to the ascending trend, namely the latest detection data A acquired by the first formaldehyde sensorNRelative to AN-1The trend of the change is rising, but N-1 data A buffered before1～AN-1All the change states of (1) are not increased;
s204, if the data in the data group B is in a continuous descending trend, judging that the response speed of the first formaldehyde sensor is higher than that of the second formaldehyde sensor, waiting for the end of the descending of the detection data of the second formaldehyde sensor, and keeping the detection data of the first formaldehyde sensor before the beginning of the ascending so as to keep the change trends of the detection data of the two formaldehyde sensors consistent, namely making V10 be AN＝AN-1Go to S209; otherwise, go to S205;
s205, if the data in the data group B is changed from a non-rising trend to a constant trend, judging that the response speed of the first formaldehyde sensor is higher than that of the second formaldehyde sensor, at the moment, waiting for the detection data of the second formaldehyde sensor to start rising is needed, and the detection data of the first formaldehyde sensor keeps the data before the first formaldehyde sensor starts rising, so that the change trends of the detection data of the two formaldehyde sensors are consistent, namely V10-AN＝AN-1Go to S209;
s206, if the data in the data group A is changed from the non-descending trend to the descending trend, the step S207 is carried out; otherwise, go to S209; the data in the data group A is changed from the non-descending trend to the descending trend, namely the latest detection data A of the first formaldehyde sensorNRelative to AN-1The trend of (2) is descending, but N-1 data A buffered before1～AN-1The change states of (A) are all not reduced;
s207, if the data in the data group B is in a continuous rising trend, it is determined that the response speed of the first formaldehyde sensor is faster than that of the second formaldehyde sensor, and at this time, it is necessary to wait for the end of rising of the detection data of the second formaldehyde sensor, and the data of the first formaldehyde sensor remains the data before the beginning of falling, so that the change trends of the detection data of the two formaldehyde sensors are consistent, that is, V10 ═ aN＝AN-1Performing S209; otherwise, go to S208;
s208, if the data in the data group B is changed from a non-descending trend to a constant trend, judging that the response speed of the first formaldehyde sensor is higher than that of the second formaldehyde sensor, at the moment, waiting for the detection data of the second formaldehyde sensor to start descending needs to be carried out, and keeping the data of the first formaldehyde sensor before the data of the first formaldehyde sensor start descending, so that the change trends of the detection data of the two formaldehyde sensors are kept consistent, namely V10 is equal to AN＝AN-1Go to S209;
s209, if the data in the data group B is changed from the non-ascending trend to the ascending trend, performing S210; otherwise, go to S212; the data in the data group B is changed from the non-ascending trend to the ascending trend, namely the second formaldehyde sensor detects B newlyNRelative to BN-1The trend of the change is rising, but N-1 data B buffered before1～BN-1The change states of (A) are all not increased;
s210, if the data in the data group A is in a continuous descending trend, judging that the response speed of the second formaldehyde sensor is higher than that of the first formaldehyde sensor, and waiting for the detection data of the first formaldehyde sensor to finish descending at the moment to detect the second formaldehyde sensorThe measured data is kept at the time before the measured data starts to rise, and further the change trends of the measured data of the two formaldehyde sensors are kept consistent, namely V20 is equal to BN＝BN-1And proceeds to S3; otherwise, go to S211;
s211, if the data in the data group A is changed from the non-rising trend to the constant trend, judging that the response speed of the second formaldehyde sensor is faster than that of the first formaldehyde sensor, waiting for the detection data of the first formaldehyde sensor to start rising at the moment, and keeping the detection data of the second formaldehyde sensor before the rising, namely, making V20 equal to BN＝BN-1And proceeds to S3;
s212, if the data in the data group B is changed from the non-descending trend to the descending trend, carrying out S213; otherwise, go to S3; the data in the data group B is changed from the non-descending trend to the descending trend, namely the latest detection data B of the second formaldehyde sensorNRelative to BN-1Has a trend of not decreasing, but N-1 data B buffered before1～BN-1The change states of (A) are all not reduced;
s213, if the data in the data set a is in the continuous rising trend, determining that the response speed of the second formaldehyde sensor is faster than that of the first formaldehyde sensor, at this time, it is necessary to wait for the end of rising of the detection data of the first formaldehyde sensor, and the detection data of the second formaldehyde sensor is kept before the beginning of falling, that is, V20 ═ BN-1, and S3 is performed; otherwise, go to S214;
s214, if the data in the data group A is changed from the non-descending trend to the constant trend, judging that the response speed of the second formaldehyde sensor is higher than that of the first formaldehyde sensor, waiting for the detection data of the first formaldehyde sensor to start descending at the moment, and keeping the detection data of the second formaldehyde sensor before the second formaldehyde sensor starts descending, namely, making V20 equal to BN＝BN-1And proceeds to S3.
S3, according to the comparison of the response speeds of the two formaldehyde sensors in the S2, the detection data of the first formaldehyde sensor and the second formaldehyde sensor at the same change trend inflection point can be obtained; namely, when the trend is just changed into the rising trend from the non-rising state trend and the trend is just changed into the rising trend from the non-falling state trend, the detection data acquired at the sampling moment before the change is taken as the detection data at the inflection point of the change trend.
When the formaldehyde sensor with the slow response speed of the first formaldehyde sensor and the second formaldehyde sensor has the same inflection point of the change trend, the first reference value V11 of the first formaldehyde sensor and the second reference value V22 of the second formaldehyde sensor are updated, and the detection data of the first formaldehyde sensor and the second formaldehyde sensor at the same inflection point of the change trend are respectively used as the first reference value V11 of the first formaldehyde sensor and the second reference value V22 of the second formaldehyde sensor. While updating V11 and V22, the formaldehyde concentration value in the environment calculated at this time is taken as the formaldehyde concentration reference value P0 in the current trend of change. When the device is used, when a first trend inflection point appears, the average value of the detection data in the B array can be used as the formaldehyde concentration reference value P0, and in the subsequent working process, the P value before updating V11 and V22 can be used as the formaldehyde concentration reference value P0.
S4, the data trend of the data in the data group a is consistent with the data trend of the data in the data group B through the processing of step S2, and this step is added to ensure the normal operation of the control flow in order to avoid the redundancy of the program operation when the device is just turned on. The system stores a first reference value V11, an initial value of a second reference value V22 and an initial value of a formaldehyde concentration reference value P0. For example, the initial values of V11, V22 and P0 can be all set to 0.
If A isN、BNIf the trend of change from the current P0 is the same, the process goes to S5, otherwise, the process goes to S7.
And S5, comparing the real-time V10 with the real-time V11 to obtain the first formaldehyde sensor synchronization data change amount, and comparing the real-time V20 with the real-time V22 to obtain the second formaldehyde sensor synchronization data change amount.
S6, if | V10-V11 | ≦ K (V20-V22) |, judging that the aldehyde content in the environment changes, and calculating a real-time formaldehyde concentration value P ═ K (V20-V22) - (V10-V11) ]/(K-1) + P0 in the environment;
otherwise, judging that only the content of the interference gas in the environment changes, keeping the real-time formaldehyde concentration value P in the environment unchanged, and setting the initial value of P to be 0.
S7、P＝P0。
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 interference condition of detecting the formaldehyde can be effectively judged according to the difference of the detection data variation of the two formaldehyde sensors, and on the basis, a more accurate formaldehyde concentration value can be calculated and obtained. Meanwhile, when the detected data variation is calculated, the influence of the response speed of the two formaldehyde sensors on the real-time performance of the data is considered, and then the detected data variation trends of the two formaldehyde sensors are kept consistent through the synchronization processing of the detected data of the two formaldehyde sensors, so that the error when the detected data variation of the two formaldehyde sensors is compared is reduced, the calculated change trend of the formaldehyde concentration in the environment is correct and the error is small when the formaldehyde concentration is greatly changed, and the calculation of the formaldehyde concentration in the environment is more accurate when the formaldehyde concentration is stable.
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 detector is used, the formaldehyde concentration in the environment can be accurately detected without specially performing an early-stage experiment, the early-stage experiment cost is low, and the data processing amount in the working process is small.
Claims (7)
1. A formaldehyde detection method is characterized in that: respectively acquiring detection data of a first formaldehyde sensor and a second formaldehyde sensor in the same environment, wherein the first formaldehyde sensor and the second formaldehyde sensor have different reaction strengths on interference components;
the method comprises the steps that detection data of a first formaldehyde sensor and detection data of a second formaldehyde sensor are synchronously processed to obtain synchronization data V10 of the first formaldehyde sensor and synchronization data V20 of the second formaldehyde sensor, so that the change trends of the detection data of the first formaldehyde sensor and the second formaldehyde sensor at the same moment are kept consistent;
and comparing the synchronization data variable quantities of the first formaldehyde sensor and the second formaldehyde sensor to judge whether the interference gas exists or not, and calculating the formaldehyde concentration value in the environment according to the judgment result of the interference gas and the synchronization data of the two formaldehyde sensors.
2. The formaldehyde detection method according to claim 1, characterized in that: respectively taking the detection data of the first formaldehyde sensor and the second formaldehyde sensor at the same change trend inflection point as a first reference value V11 of the first formaldehyde sensor and a second reference value V22 of the second formaldehyde sensor;
v10 is compared to V11 to obtain a first formaldehyde sensor synchronized data variance, and V20 is compared to V22 to obtain a second formaldehyde sensor synchronized data variance.
3. The formaldehyde detection method according to claim 2, characterized in that: the reaction intensity of the first formaldehyde sensor to the interfering component is F1, the reaction intensity of the second formaldehyde sensor to the interfering component is F2, F1 is KF2, wherein K is more than 1;
if the absolute value of V10-V11 is less than or equal to absolute value of K (V20-V22), judging that the content of aldehydes in the environment changes, otherwise, judging that only the content of the interference gas in the environment changes.
4. The formaldehyde detection method according to claim 3, characterized in that: when the formaldehyde sensors with slow response speed in the first formaldehyde sensor and the second formaldehyde sensor have the same inflection point of the variation trend, updating a first reference value V11 of the first formaldehyde sensor and a second reference value V22 of the second formaldehyde sensor,
while updating V11 and V22, taking the formaldehyde concentration value in the environment calculated at the moment as a formaldehyde concentration reference value P0 under the current variation trend;
when the aldehyde content in the environment is judged to be changed, calculating a real-time formaldehyde concentration value P in the environment;
P＝[K*(V20－V22)－(V10－V11)]/(K－1)+P0；
when the content of only the interference gas in the environment is judged to be changed, the real-time formaldehyde concentration value P in the environment is kept unchanged.
5. The formaldehyde detection method according to any one of claims 1 to 4, characterized in that: the method for synchronously processing the detection data of the first formaldehyde sensor and the second formaldehyde sensor comprises the following steps:
respectively storing a detection data group A of a first formaldehyde sensor and a detection data group B of a second formaldehyde sensor according to a first-in first-out principle;
A＝[A1,A2,……,Ai,……AN-1,AN]，B＝[B1,B2,……,Bi,……BN-1,BN]wherein i and N are natural numbers, i is more than or equal to 0 and less than or equal to N, and N is more than or equal to 3; a. theN、BNRespectively obtaining the current detection data of a first formaldehyde sensor and a second formaldehyde sensor;
if A isNTrend of change with respect to other data in data set A and BNThe trend is the same relative to other data in data group B, then V10 ═ aN，V20＝BN；
If A isNTrend of change with respect to other data in data set A and BNJudging that the response speeds of the first formaldehyde sensor and the second formaldehyde sensor are different when the change trends of other data in the data group B are inconsistent, and simultaneously comparing and judging the response speed of the first formaldehyde sensor and the response speed of the second formaldehyde sensor;
if the response speed of the first formaldehyde sensor is faster than that of the second formaldehyde sensor, V10 is made to be AN＝AN-1While V20 ═ BN(ii) a If the first formaldehyde sensor has a slower response speed than the second formaldehyde sensor, then V10 ═ ANSimultaneously, let V20 be BN＝BN-1。
6. The formaldehyde detection method according to claim 5, characterized in that: the method for synchronizing the detection data under the condition that the response speeds of the first formaldehyde sensor and the second formaldehyde sensor are different comprises the following steps:
s202, judging the change trend of the data detected by the first formaldehyde sensor according to the data in the data group A, and judging the change trend of the second formaldehyde sensor according to the data group B;
s203, if the data in the data group A is changed from the non-ascending trend to the ascending trend, carrying out S204; otherwise, go to S206;
s204, if the data in the data group B continuously decrease, judging that the response speed of the first formaldehyde sensor is higher than that of the second formaldehyde sensor, and enabling V10 to be AN＝AN-1Performing S209; otherwise, go to S205;
s205, if the data in the data group B are changed from the non-ascending trend to the constant trend, judging that the response speed of the first formaldehyde sensor is higher than that of the second formaldehyde sensor, and enabling V10 to be equal to AN＝AN-1Performing S209;
s206, if the data in the data group A is changed from the non-descending trend to the descending trend, the step S207 is carried out; otherwise, performing S209;
s207, if the data in the data group B continuously rise, judging that the response speed of the first formaldehyde sensor is higher than that of the second formaldehyde sensor, and enabling V10 to be equal to AN＝AN-1Performing S209; otherwise, go to S208;
s208, if the data in the data group B are changed from a non-descending trend to a constant trend, judging that the response speed of the first formaldehyde sensor is higher than that of the second formaldehyde sensor, and enabling V10 to be AN＝AN-1Go to S209;
s209, if the data in the data group B is changed from the non-ascending trend to the ascending trend, carrying out S210; otherwise, go to S212;
s210, if the data in the data group A continuously decrease, judging that the response speed of the second formaldehyde sensor is higher than that of the first formaldehyde sensor, and enabling V20 to be BN＝BN-1(ii) a Otherwise, go to S211;
s211, if the data in the data group A is changed from the non-ascending trend to the ascending trendIf the response speed of the second formaldehyde sensor is judged to be higher than that of the first formaldehyde sensor, and V20 is set to be BN＝BN-1；
S212, if the data in the data group B is changed from the non-descending trend to the descending trend, carrying out S213;
s213, if the data in the data group A continuously rise, judging that the response speed of the second formaldehyde sensor is higher than that of the first formaldehyde sensor, and enabling V20 to be BN＝BN-1(ii) a Otherwise, go to S214;
s214, if the data in the data group A is changed from the non-descending trend to the constant trend, judging that the response speed of the second formaldehyde sensor is higher than that of the first formaldehyde sensor, and enabling V20 to be BN＝BN-1。
7. A formaldehyde detecting device using the method according to any one of claims 1 to 6, 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 have different reaction strengths of interference components, and the first formaldehyde sensor and the second formaldehyde sensor are electrically connected with the controller respectively.
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