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Pressure compensation method of electrochemical gas sensor

A gas sensor, pressure compensation technology, applied in the direction of electrochemical variables of materials, etc., can solve the problem of inaccurate measurement, and achieve the effect of improving accuracy

Active Publication Date: 2016-05-11
GL TECH CO LTD
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Problems solved by technology

[0003] The purpose of the present invention is to provide a pressure compensation method for electrochemical gas sensors to solve the problem of inaccurate measurement of existing electrochemical gas sensors under different pressure environments

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  • Pressure compensation method of electrochemical gas sensor
  • Pressure compensation method of electrochemical gas sensor
  • Pressure compensation method of electrochemical gas sensor

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Embodiment Construction

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0025] The invention provides a pressure compensation method of an electrochemical gas sensor, such as figure 1 As shown, first, the electrochemical gas sensor outputs the original AD conversion value after the detection value is passed through the signal conditioning circuit and AD conversion, and then performs pressure compensation processing with the detection value of the digital pressure sensor processed by the CPU, and outputs the pressure compensated AD value . Specifically, first determine the first pressure compensation coefficient k and the second pressure compensation coefficient b of the electrochemical gas sensor to be compensated; according to the determined first pressure compensation coefficient and second pressure compensation coefficient, the current air pressure P x Under the gas concentration measurement value compensated to the reference...

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Abstract

The invention relates to a pressure compensation method of an electrochemical gas sensor. The method comprises the following steps: 1, determining the first pressure compensation coefficient k and the second pressure compensation coefficient b of an electrochemical gas sensor to be compensated; and 2, compensating the gas concentration under a current gas pressure Px to a reference gas concentration under a reference gas pressure P0 according to the first pressure compensation coefficient and the second pressure compensation coefficient determined in step 1, wherein the reference gas concentration is inversely proportional to the reference gas pressure P0, and is proportional to the gas concentration measurement value, the current gas pressure Px and EXP(klnPx + b). Pressure compensation of the AD value of the electrochemical gas sensor at different pressures is carried out through determining the pressure compensation coefficients k and b of the electrochemical gas sensor, so the pressure compensation method of the electrochemical gas sensor can effectively guarantee the stability of the AD value of the original output signal of the electrochemical gas sensor under same concentration and different pressures, and improves the accuracy of the electrochemical gas sensor.

Description

technical field [0001] The invention relates to the field of metering and detection, in particular to a pressure compensation method for an electrochemical gas sensor. Background technique [0002] Electrochemical sensors have significant advantages such as low power consumption, fast response, high sensitivity, good linearity, good long-term stability, and low cost, and are widely used in gas monitoring in coal mine drainage pipelines. The original output of the electrochemical gas sensor is a current or voltage signal, and the original output current or voltage signal needs to be converted into a digital signal (hereinafter referred to as the AD value) through a signal conditioning circuit and then calibrated to obtain the final expression. The value of the gas concentration. However, because the electrochemical gas sensor is greatly affected by the pressure of the monitoring environment, when the environmental pressure changes, the original output signal of the electroch...

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Application Information

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IPC IPC(8): G01N27/26
CPCG01N27/26
Inventor 赵彤宇陈军李波赵静涛郭洪斌张胜峰刘东旭贺彩红
Owner GL TECH CO LTD
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