CN114217021A - Concentration compensation method and detection method for gas detection and detection device - Google Patents
Concentration compensation method and detection method for gas detection and detection device Download PDFInfo
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Abstract
The invention provides a concentration compensation method for gas detection, which comprises the following steps: setting a target gas type; acquiring the concentration of theoretical reference gas of target gas reaction; obtaining a compensation coefficient of the target gas corresponding to the reference gas; and multiplying the reference gas concentration by the compensation coefficient to obtain the target gas concentration. According to the invention, through the gas attribute table, the reference gas type, the reference gas concentration and the target gas type, the sensor or the detection device can be free of replacement and calibrated, the target gas is compensated in a self-adaptive manner, and the target gas concentration is directly displayed; by comparing the target gas concentration with the target gas high-low threshold, the current concentration state can be judged and the subsequent equipment can be informed.
Description
Technical Field
The invention relates to the technical field of gas detection, in particular to a concentration compensation method, a detection method and a detection device for gas detection.
Background
With the frequent occurrence of safety accidents in various chemical plants and other industrial occasions, the corresponding safety systems also face more serious challenges. As an important component of the safety system, how the gas detection device can more accurately react to concentration, more accurately identify gas, respond to abnormality more quickly, and notify the subsequent equipment more timely is the main lifting direction of the gas detection device. Various industrial occasions generally have complex field environments and various polluted gases, and various gases react on the same gas detection device, but the current gas instrument market generally has the same sensor for detecting the same gas, so that the application range of a single detection device is narrow. How the gas detection device can accurately detect multiple associated gases simultaneously without replacing a sensor and calibrating, accurately display the types and the concentrations of the gases on site and timely inform the subsequent equipment, and is a main research object of the gas detection device.
Disclosure of Invention
In view of the above technical problems, the present invention provides a concentration compensation method, a detection method and a detection device for gas detection, so as to solve the problem of narrow application range of a single detection device in the prior art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method of concentration compensation for gas detection, comprising the steps of:
setting a target gas type;
acquiring the concentration of theoretical reference gas corresponding to target gas reaction;
obtaining a compensation coefficient of the target gas corresponding to the reference gas;
and multiplying the concentration of the reference gas by a compensation coefficient to obtain the concentration of the target gas.
Further, the specific steps of obtaining the compensation coefficient are as follows:
taking a plurality of detection devices, and calibrating by using a reference gas with a concentration value of x;
detecting a target gas with a concentration value x by a plurality of detection devices to obtain a plurality of concentration display values y1 and y2 … … yn;
by the formula: the compensation coefficient a = y/x, and a plurality of compensation coefficients a1 and a2 … … an can be obtained;
and carrying out statistics and curve fitting on the plurality of compensation coefficients to obtain a distribution curve, and obtaining a coefficient average value ā in a peak value interval of the distribution curve as the compensation coefficient.
Further, the specific step of obtaining the compensation coefficient further includes:
obtaining a compensation coefficient reference value of the detection device for the target gas;
comparing the position A of the compensation coefficient reference value on the distribution curve;
if the position A is near the peak of the distribution curve, the average value ā of the coefficients in a certain interval of the peak of the distribution curve is taken as the compensation coefficient.
A method of detection comprising the steps of:
s1, setting the type of the target gas;
s2, acquiring the concentration of theoretical reference gas corresponding to the target gas reaction;
s3, judging whether the target gas type exists or not, if so, obtaining a compensation coefficient and a high-low reporting threshold value of the reference gas corresponding to the target gas, and if not, executing the step S6;
s4, obtaining a target gas concentration = the concentration x compensation coefficient of the reference gas;
s5, judging whether the concentration of the target gas exceeds a target gas height reporting threshold value or not, and recording an alarm state if the concentration of the target gas exceeds the target gas height reporting threshold value;
s6, if the target gas type exists, repeating the step S3, and if not, executing the step S7;
s7, checking whether an alarm state exists, if so, informing the high-low report state of the rear-stage equipment, and if not, continuing to execute the step S7;
and S8, finishing compensation.
A detection device using the detection method comprises:
the gas sensor is used for detecting the concentration of target gas in the environment and outputting the concentration of theoretical reference gas corresponding to the on-site target gas reaction;
the storage module is internally stored with a gas attribute table and used for automatically acquiring a compensation coefficient according to the type of the target gas;
and the logic control unit is respectively connected with the gas sensor and the storage module and obtains the compensated target gas concentration according to the reference gas concentration.
Further, the method for obtaining the compensation coefficient comprises the following steps: detecting target gas with concentration value x by a plurality of detection devices to obtain a plurality of concentration display values y1 and y2 … … yn, and obtaining a target gas concentration value by the following formula: the compensation coefficient a = y/x, a plurality of compensation coefficients a1, a2 … … an can be obtained, then statistics and curve fitting are carried out on the plurality of compensation coefficients to obtain a distribution curve, and a coefficient average ā in a peak interval of the distribution curve is obtained to serve as the compensation coefficient.
The gas alarm device further comprises an alarm unit, the logic control unit is connected with the alarm unit, the logic control unit judges whether the target gas height alarm threshold value is exceeded or not according to the target gas concentration, and the alarm state is recorded when the target gas height alarm threshold value is exceeded.
And the logic control unit is connected with the rear-stage equipment and is used for informing the rear-stage equipment of the alarm state.
And the logic control unit is connected with the display unit and is used for displaying the concentration of the target gas and/or the alarm state.
The invention has the beneficial effects that: according to the invention, through the gas attribute table, the reference gas type, the reference gas concentration and the target gas type, the sensor or the detection device can be free of replacement and calibrated, the target gas is compensated in a self-adaptive manner, and the target gas concentration is directly displayed; by comparing the target gas concentration with the target gas high-low threshold, the current concentration state can be judged and the subsequent equipment can be informed.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of the detection method of the present invention;
FIG. 2 is a schematic structural diagram of a detecting device according to the present invention;
FIG. 3 is a diagram of an application of the detecting device of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
The concentration compensation method for gas detection comprises the following steps:
setting a target gas type;
acquiring the concentration of theoretical reference gas corresponding to target gas reaction;
obtaining a compensation coefficient of the target gas corresponding to the reference gas;
and multiplying the concentration of the reference gas by a compensation coefficient to obtain the concentration of the target gas.
The reference gas is used for standard inspection of the gas detection equipment before factory shipment. And carrying out a statistical experiment through the reaction of a plurality of different target gases and the detection equipment calibrated by the reference gas to obtain the theoretical corresponding relation between the reaction concentration of the plurality of different target gases and the reaction concentration of the reference gas. Thus, at the time of detection, after the target gas reacts with the gas detection device, a corresponding theoretical reference gas concentration is obtained. The target gas is a gas present in the target environment to be detected, i.e. a gas that needs to be compensated. Before detection, a person familiar with a target environment sets a field target gas type capable of reacting with the gas detection equipment in advance, so that the field complete target gas type is obtained, and possible gas omission is avoided. The compensation coefficient is obtained by looking up a gas property table according to the target gas of the reaction. A plurality of target gas types are recorded on the gas attribute table, and corresponding compensation coefficients are recorded.
Further, the specific steps of obtaining the compensation coefficient are as follows:
taking a plurality of detection devices adopting the same type of sensors, and obtaining a compensation coefficient reference value of the sensors to the target gas through sensor technical data; calibrating a plurality of detection devices by using a reference gas with a concentration value x; respectively introducing target gas with a concentration value of x into the plurality of detection devices, namely respectively detecting the target gas with the concentration value of x by the plurality of detection devices to obtain a plurality of concentration display values y1 and y2 … … yn; by the formula: the compensation coefficient a = y/x, and a plurality of compensation coefficients a1 and a2 … … an can be obtained; and counting and curve fitting the plurality of compensation coefficients to obtain a distribution curve similar to normal distribution, comparing the position A of the compensation coefficient reference value on the distribution curve, and if the position A is near the peak value of the distribution curve, acquiring a coefficient average value ā in a certain interval of the peak value of the distribution curve as the compensation coefficient.
A detection method, as shown in fig. 1, specifically includes the following steps:
s1, setting the possible target gas type in the detection site from the known multiple target gas types;
s2, acquiring the concentration of theoretical reference gas corresponding to the target gas reaction on site;
s3, judging whether the type of the target gas is stored in the device for detection, if so, obtaining a compensation coefficient and a high-low reporting threshold of the reference gas corresponding to the target gas, and if not, executing the step S6;
s4, obtaining a target gas concentration = the concentration x compensation coefficient of the reference gas;
s5, judging whether the concentration of the target gas exceeds a target gas height reporting threshold value or not, and recording an alarm state if the concentration of the target gas exceeds the target gas height reporting threshold value;
s6, if the target gas type exists, repeating the step S3, and if not, executing the step S7;
s7, checking whether an alarm state exists, if so, informing the high-low report state of the rear-stage equipment, and if not, continuing to execute the step S7;
and S8, finishing compensation.
A detection device using the detection method is shown in figures 1-3, and the compensation method is adopted for compensation detection. Before the detection device is used, relevant parameters are determined according to sensor characteristics, calibration precision and the like adopted by the detection device, the relevant parameters mainly comprise a reference gas type, a reference gas calibration curve, a target gas type and the like, and a software module containing the determined parameters is arranged in the detection device. The detection device includes: the gas sensor is used for detecting the concentration of target gas in the environment and outputting the concentration of reference gas. The reference gas is used when the detection device uses the gas sensor to perform calibration before shipment. Before leaving the factory, a plurality of different target gases react with the detection equipment and then a statistical experiment is carried out to obtain the theoretical corresponding relation between the reaction concentration of the plurality of different target gases and the reaction concentration of the reference gas, namely when the device is used for detection work, firstly, a worker sets the type of the target gases possibly existing on the site, and then, according to the reaction of the target gases on the site, the detection device obtains the concentration value of the corresponding reference gas. The storage module stores a gas attribute table and parameters, the gas attribute table is established based on the reaction concentration of the reference gas, and the gas attribute table comprises all gas types which normally react with the same gas detection device, a compensation coefficient of the target gas relative to the reference gas and a high-low threshold, and the compensation coefficient of the reference gas is 1. All the reactive gas types are obtained by technical data provided by a sensor manufacturer, and the compensation coefficient is obtained by the step of obtaining the compensation coefficient in the compensation method before the device leaves a factory, and the compensation coefficient is the proportion of the corresponding target gas to be compensated relative to the reference gas. And the logic control unit is respectively connected with the gas sensor, the storage module and the power supply, and calculates according to the concentration and the compensation coefficient of the reference gas and a preset compensation rule to obtain the compensated target gas concentration. The preset compensation rule is as follows: target gas concentration = reference gas concentration ×. compensation factor.
The detection device further comprises an alarm unit, the logic control unit is connected with the alarm unit, and the logic control unit judges whether the target gas exceeds a target gas height alarm threshold value according to the target gas concentration and records an alarm state when the target gas exceeds the target gas height alarm threshold value. The target gas height report threshold value is set by referring to national standards, industries and customer requirements, and all related target gas height report threshold values are set.
Furthermore, the detection device also comprises a rear-stage device and a display unit, wherein the logic control unit is connected with the rear-stage device and is used for informing the rear-stage device of the alarm state; and the logic control unit is connected with the display unit and is used for displaying the concentration of the target gas and/or the alarm state.
When the detection device is used, the detection device is firstly placed in a field environment, field personnel input the type of gas possibly existing on the field, the power supply is switched on, and if target gas leaks on the field, the gas detection device calculates the target gas concentration and the alarm state by a gas concentration compensation method and informs the later-stage equipment.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A method of concentration compensation for gas detection, comprising the steps of:
setting a target gas type;
acquiring the concentration of theoretical reference gas corresponding to target gas reaction;
obtaining a compensation coefficient of the target gas corresponding to the reference gas;
and multiplying the concentration of the reference gas by a compensation coefficient to obtain the concentration of the target gas.
2. The method for compensating concentration of gas detection according to claim 1, wherein the specific step of obtaining the compensation coefficient is:
taking a plurality of detection devices, and calibrating by using a reference gas with a concentration value of x;
detecting a target gas with a concentration value x by a plurality of detection devices to obtain a plurality of concentration display values y1 and y2 … … yn;
by the formula: the compensation coefficient a = y/x, and a plurality of compensation coefficients a1 and a2 … … an can be obtained;
and carrying out statistics and curve fitting on the plurality of compensation coefficients to obtain a distribution curve, and obtaining a coefficient average value ā in a peak value interval of the distribution curve as the compensation coefficient.
3. The method of claim 2, wherein the step of obtaining the compensation factor further comprises:
obtaining a compensation coefficient reference value of the detection device for the target gas;
comparing the position A of the compensation coefficient reference value on the distribution curve;
if the position A is near the peak of the distribution curve, the average value ā of the coefficients in a certain interval of the peak of the distribution curve is taken as the compensation coefficient.
4. A method of detection, comprising the steps of:
s1, setting the type of the target gas;
s2, acquiring the concentration of theoretical reference gas corresponding to the target gas reaction;
s3, judging whether the target gas type exists or not, if so, obtaining a compensation coefficient and a high-low reporting threshold value of the reference gas corresponding to the target gas, and if not, executing the step S6;
s4, obtaining a target gas concentration = the concentration x compensation coefficient of the reference gas;
s5, judging whether the concentration of the target gas exceeds a target gas height reporting threshold value or not, and recording an alarm state if the concentration of the target gas exceeds the target gas height reporting threshold value;
s6, if the target gas type exists, repeating the step S3, and if not, executing the step S7;
s7, checking whether an alarm state exists, if so, informing the high-low report state of the rear-stage equipment, and if not, continuing to execute the step S7;
and S8, finishing compensation.
5. A detection apparatus using the detection method according to claim 4, comprising:
the gas sensor is used for detecting the concentration of target gas in the environment and outputting the concentration of theoretical reference gas corresponding to the on-site target gas reaction;
the storage module is internally stored with a gas attribute table and used for automatically acquiring a compensation coefficient according to the type of the target gas;
and the logic control unit is respectively connected with the gas sensor and the storage module and obtains the compensated target gas concentration according to the concentration of the reference gas.
6. The detection device according to claim 5, wherein the method for obtaining the compensation coefficient comprises: detecting target gas with concentration value x by a plurality of detection devices to obtain a plurality of concentration display values y1 and y2 … … yn, and obtaining a target gas concentration value by the following formula: the compensation coefficient a = y/x, a plurality of compensation coefficients a1, a2 … … an can be obtained, then statistics and curve fitting are carried out on the plurality of compensation coefficients to obtain a distribution curve, and a coefficient average ā in a peak interval of the distribution curve is obtained to serve as the compensation coefficient.
7. The detection device according to claim 5 or 6, further comprising an alarm unit, wherein the logic control unit is connected with the alarm unit, judges whether the target gas height threshold value is exceeded or not according to the target gas concentration, and records an alarm state when the target gas height threshold value is exceeded.
8. The detection apparatus according to claim 7, further comprising a back-stage device, wherein the logic control unit is connected to the back-stage device for notifying the back-stage device of the alarm state.
9. The detection device according to claim 8, further comprising a display unit, wherein the logic control unit is connected with the display unit for displaying the target gas concentration and/or the alarm state.
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