CN116008385B - TVOC monitoring equipment calibration method - Google Patents
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- CN116008385B CN116008385B CN202310306842.9A CN202310306842A CN116008385B CN 116008385 B CN116008385 B CN 116008385B CN 202310306842 A CN202310306842 A CN 202310306842A CN 116008385 B CN116008385 B CN 116008385B
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Abstract
The invention relates to the technical field of monitoring equipment calibration, in particular to a TVOC monitoring equipment calibration method. The technical scheme provided by the invention comprises the steps of calibrating reference equipment; in the same test environment, the reference equipment and the equipment to be calibrated are monitored within a preset time period; the detection principle of the reference equipment is the same as that of the equipment to be calibrated; calculating correlation according to the first monitoring result of the reference equipment and the second monitoring result of the equipment to be calibrated; judging whether the equipment to be calibrated is abnormal or not according to the correlation; and if the judging result is normal, calibrating the equipment to be calibrated.
Description
Technical Field
The invention relates to the technical field of monitoring equipment calibration, in particular to a TVOC monitoring equipment calibration method.
Background
A TVOC (Total Volatile Organic Compounds, total volatile organic compound) sensor based on the PID principle is a device that employs an ultraviolet lamp to ionize a sample gas, thereby detecting its concentration. The device has small volume and better sensitivity to low-concentration gas, thereby being applied to portable and online fixed monitoring. However, due to drift of zero point and sensitivity decay of the TVOC sensor, the zero point and sensitivity of the sensor need to be calibrated periodically.
The current method for calibrating the TVOC sensor based on the PID principle is to calibrate the zero point and the sensitivity of the sensor by passing zero point gas and standard gas through the sensor, and the method can calibrate the zero point and the sensitivity parameters of the sensor with high precision, but the single calibration time of using the zero point gas and the standard gas calibration equipment is long, and the standard gas is used to bring secondary pollution and high cost. And the zero voltage and the sensitivity of the sensor are required to be repeatedly adjusted again for calibrating the equipment to be calibrated in different batches, so that the workload is high and serious pollution is caused.
Disclosure of Invention
Based on the defects in the prior art, the invention provides a TVOC sensor calibration method to solve the problems of long time consumption and serious pollution of the TVOC sensor calibration, comprising the following steps:
calibrating the reference equipment;
in the same test environment, the reference equipment and the equipment to be calibrated are monitored within a preset time period; the detection principle of the reference equipment is the same as that of the equipment to be calibrated;
calculating correlation according to the first monitoring result of the reference equipment and the second monitoring result of the equipment to be calibrated;
judging whether the equipment to be calibrated is abnormal or not according to the correlation;
and if the judging result is normal, calibrating the equipment to be calibrated.
In some embodiments, the calibrating the reference device comprises:
calibrating a zero point of the reference device by providing zero gas to the reference device;
the sensitivity of the reference device is calibrated by providing a standard gas to the reference device.
In some embodiments, the detection principle comprises: PID detection principle.
In some embodiments, the determining whether the device to be calibrated is abnormal according to the correlation includes:
and if the correlation is larger than a first preset value, judging that the equipment to be calibrated is normal.
In some embodiments, the first monitoring result comprises a concentration value data set comprising a plurality of concentration values periodically acquired by the reference device;
the second monitoring result comprises a voltage value data set, wherein the voltage value data set comprises a plurality of voltage values periodically acquired through the equipment to be calibrated.
In some embodiments, the concentration value data set and the voltage value data set are acquired with the same reading period, the reading period being between 5-60 minutes.
In some embodiments, the length of the preset time period is not less than 24 hours.
In some embodiments, the calibrating the device to be calibrated includes:
and calculating the calibration zero point voltage and the calibration sensitivity of the equipment to be calibrated according to the voltage value data set and the concentration value data set.
In some embodiments, the calculation formula of the calibration zero voltage is expressed as:
In some embodiments, the calculation formula for the calibration sensitivity is expressed as:
In some embodiments, the calibrating the device to be calibrated further comprises:
and if the calibration sensitivity is greater than or equal to a second preset value, calibrating the equipment to be calibrated according to the calibration zero voltage and the calibration sensitivity, otherwise, performing abnormality detection.
In some embodiments, the second preset value is not less than 30 μv/ppb.
In some embodiments, the first preset value is not less than 0.95.
In some embodiments, the detection target components of the baseline device and the device to be calibrated are the same.
Compared with the prior art, the method only needs to introduce the standard gas with pollution when calibrating the reference equipment, and the calibration standard of the equipment to be calibrated has no gas environment requirement, so that the standard gas does not need to be repeatedly introduced for the calibration of a plurality of equipment to be calibrated, and the pollution is reduced; and the batch of equipment to be calibrated and the reference equipment are placed in the same test environment at one time to obtain respective corresponding monitoring results so as to perform subsequent calibration calculation, and the workload and time consumption are saved for batch calibration operation.
Drawings
In order to more clearly illustrate the embodiments of the present description or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the embodiments of the present description, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.
FIG. 1 is a flow chart of a method for calibrating a TVOC sensor provided by the invention;
FIG. 2 is a schematic flow chart of an embodiment of the present invention;
FIG. 3 is a diagram of comparison monitoring data according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a result verification curve according to an embodiment of the present invention.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
For the purpose of facilitating an understanding of the embodiments of the present application, reference will now be made to the following description of specific embodiments, taken in conjunction with the accompanying drawings, in which the embodiments are not intended to limit the embodiments of the present application.
The embodiment of the invention provides a method for calibrating TVOC monitoring equipment, which is shown in figure 1 and comprises the following steps:
and step 1, calibrating the reference equipment.
In this embodiment, the device to be calibrated may be a TVOC monitoring device based on the PID principle, and the calibration target is to unify the readings of the device to be calibrated and the actual VOC concentration in the environment, since the voltage value of the device to be calibrated is related to the actual VOC concentration, and the rate of change (also called sensitivity) of the voltage value with the concentration is uncertain due to the difference of the sensors used by the device, so that the calibration process needs to determine the actual zero voltage and the sensitivity of the device to be calibrated. The voltage value of the monitoring device versus the actual concentration is expressed as: (current voltage value-zero voltage value)/sensitivity = current concentration value.
The reference device is a monitoring device having the same monitoring principle and the same detection target component as the device to be calibrated. The method is characterized in that the standard equipment and the equipment to be calibrated are guaranteed to have higher linearity, and concentration data which accords with the actual environment condition is provided for the calibration calculation of the equipment to be calibrated through the standard equipment.
In this embodiment, the process of calibrating the reference device includes:
1. the zero point of the reference device is calibrated by providing zero gas to the reference device.
2. The sensitivity of the reference device is calibrated by providing a standard gas to the reference device. When the standard gas is monitored by the reference equipment, the sensitivity of the reference equipment is adjusted to enable the measured value to be matched with the concentration of the standard gas, and the sensitivity is calibrated according to the relation between the voltage value and the actual concentration value of the monitoring equipment. By the method, the zero point and the sensitivity of the reference device can be calibrated with high precision.
In particular, the zero gas or standard gas may be provided to the reference device by way of a zero gas tank or standard gas tank that is vented to the gas inlet of the reference device via a conduit so that the reference device may monitor zero concentration gas or standard gas having a specific concentration for calibration. Preferably, in some embodiments, the zero or standard gas is provided by a device such as a gas generator, which is also used to generate the zero or standard gas and the gas is channeled through a conduit to the reference device for calibration. Alternatively, in some preferred embodiments, the reference device is directly provided with a zero or standard gas environment, for example by placing the reference device in a closed space into which zero or standard gas is delivered to provide a corresponding gas environment for calibration.
And 2, monitoring the reference equipment and the equipment to be calibrated in the same test environment within a preset time period, obtaining a first monitoring result through the reference equipment, and obtaining a second monitoring result through the equipment to be calibrated.
In some embodiments, the first monitoring result comprises a concentration value data set obtained by periodically reading concentration measurements of the reference device; the second monitoring result comprises a voltage value data set, wherein the voltage value data set is obtained by periodically reading the voltage value of the equipment to be calibrated. Preferably, the concentration value data set and the voltage value data set are acquired with the same reading period, and the reading period is between 5 and 60 minutes.
Furthermore, due to the laws of circadian variation of VOC pollution, in some embodiments, continuous comparison monitoring times, i.e. set time periods of at least 24 hours, preferably two days, are required. As shown in fig. 2, the reference device and the group of devices to be detected (device 1 to device 10) of the present embodiment are monitoring data for 48 hours. To reduce the amount of calculation, the reading period in this embodiment is 1 hour.
And step 3, calculating correlation according to the first monitoring result of the reference equipment and the second monitoring result of the equipment to be calibrated.
According to the linear relation between the voltage value and the concentration value of the device, the correlation between the voltage value data set and the concentration value data set of the device to be detected is calculated, and the correlation can be equivalent to the correlation between the change trend of the detection result of the test environment of the device to be detected and the change of the VOC concentration of the actual atmosphere environment.
And step 4, judging whether the equipment to be calibrated is abnormal or not according to the correlation.
In this embodiment, as shown in fig. 2, if the correlation is greater than the first preset value, it is determined that the sensor in the device is not abnormal, and the device to be calibrated is normal, so that calibration can be performed. If the correlation is not greater than the first preset value, judging that the sensor in the equipment is abnormal, and checking the reason of the abnormality of the sensor. Preferably, the first preset value is not lower than 0.95 in some embodiments, taking into account the fitting error between the monitored data and the actual situation.
For the monitoring data shown in fig. 3, the correlation of the voltage values of the respective devices 1 to 10 to be calibrated with the reference device concentration values is shown in table 1 below.
TABLE 1 correlation of voltage values of devices 1-10 to be calibrated with reference device concentration values
The correlation between the voltage value of the equipment 1-10 to be calibrated and the concentration value of the reference equipment is larger than 0.95, the linearity is good, and the equipment to be calibrated can be calibrated.
And step 5, if the judgment result is normal, calibrating the equipment to be calibrated.
In some embodiments, as shown in fig. 2, calibrating the device to be calibrated includes:
and calculating the calibration zero point voltage and the calibration sensitivity of the equipment to be calibrated according to the voltage value data set and the concentration value data set.
Specifically, the calculation formula of the calibration zero point voltage is expressed as:
The calculation formula of the calibration sensitivity is expressed as:
where S represents the calibration sensitivity and,
an ith element representing said voltage value data set,/->
An ith element representing said concentration value data set,/->
Represents the sum average of the voltage value data sets,/->
Representing the summed average of the concentration value data sets. Calibration of each device is calculated from the monitored data as shown in FIG. 3The sensitivity and calibration zero voltage are shown in table 2 below.
TABLE 2 calibration sensitivity calibration zero voltage for devices 1-10 to be calibrated
Preferably, in some embodiments, calibrating the device to be calibrated further comprises:
and if the calibration sensitivity is larger than a second preset value, calibrating the equipment to be calibrated according to the calibration zero voltage and the calibration sensitivity, otherwise, performing anomaly detection.
Because the VOC concentration in the environment to be monitored is generally very low, if the sensitivity of the monitoring device is low, the actual concentration cannot be measured correctly, which is generally caused by the sensitivity degradation of the sensor, and it is necessary to check or replace the sensor and then calibrate the sensor, so as to avoid that unqualified monitoring devices are used through calibration. In some embodiments, the second preset value is not less than 30 μV/ppb.
As shown in fig. 4, fig. 4 is a graph showing the concentration measured values corresponding to the devices other than the device 4 calculated from the data in tables 1 and 2, and the measured data of each device to be calibrated is found to be close to the reference device in height during the monitoring period.
Compared with the prior art, the method only needs to introduce the standard gas with pollution when calibrating the reference equipment, and the calibration standard of the equipment to be calibrated has no gas environment requirement, so that the standard gas does not need to be repeatedly introduced for the calibration of a plurality of equipment to be calibrated, and the pollution is reduced; and the batch of equipment to be calibrated and the reference equipment are placed in the same atmosphere environment at one time to obtain respective corresponding voltage value data sets so as to perform subsequent calibration calculation, and the workload and time consumption are saved for batch calibration operation.
It is noted that the flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of function in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied in hardware, in a software module executed by a processor, or in a combination of the two. The software modules may be disposed in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present application, and are not meant to limit the scope of the invention, but to limit the scope of the invention.
Claims (10)
1. A method for calibrating a TVOC monitoring device, comprising the steps of:
calibrating the reference equipment;
in the same test environment, the reference equipment and the equipment to be calibrated are monitored within a preset time period; the detection principle of the reference equipment is the same as that of the equipment to be calibrated, and the detection target components are the same; the preset time period is at least 24 hours;
obtaining a first monitoring result through a reference device, obtaining a second monitoring result through a device to be calibrated, and calculating correlation according to the first monitoring result of the reference device and the second monitoring result of the device to be calibrated; the first monitoring result includes a concentration value data set obtained by periodically reading a concentration measurement value of the reference device; the second monitoring result comprises a voltage value data set, wherein the voltage value data set is obtained by periodically reading the voltage value of the equipment to be calibrated;
judging whether the equipment to be calibrated is abnormal or not according to the correlation;
if the judging result is normal, calibrating the equipment to be calibrated;
the calibrating the equipment to be calibrated comprises the following steps:
and calculating the calibration zero point voltage and the calibration sensitivity of the equipment to be calibrated according to the voltage value data set and the concentration value data set.
2. The TVOC monitoring device calibration method of claim 1, wherein: the calibrating of the reference device includes:
calibrating a zero point of the reference device by providing zero gas to the reference device;
the sensitivity of the reference device is calibrated by providing a standard gas to the reference device.
3. The TVOC monitoring device calibration method of claim 1, wherein: the detection principle comprises the following steps: PID detection principle.
4. A TVOC monitoring device calibration method according to claim 2 or 3, wherein: and judging whether the equipment to be calibrated is abnormal according to the correlation, wherein the judging comprises the following steps:
and if the correlation is larger than a first preset value, judging that the equipment to be calibrated is normal.
5. The TVOC monitoring device calibration method of claim 1, wherein: the concentration value data set and the voltage value data set are obtained by adopting the same reading period, and the reading period is between 5 and 60 minutes.
6. The TVOC monitoring device calibration method of claim 1, wherein: the calculation formula of the calibration zero voltage is expressed as follows:
7. The TVOC monitoring device calibration method of claim 1, wherein: the calculation formula of the calibration sensitivity is expressed as follows:
8. The TVOC monitoring device calibration method of claim 1, wherein: the calibrating the device to be calibrated further comprises:
and if the calibration sensitivity is greater than or equal to a second preset value, calibrating the equipment to be calibrated according to the calibration zero voltage and the calibration sensitivity, otherwise, performing abnormality detection.
9. The TVOC monitoring device calibration method of claim 8 wherein: the second preset value is not lower than 30 mu V/ppb.
10. The TVOC monitoring device calibration method of claim 4, wherein: the first preset value is not lower than 0.95.
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