Method for measuring service life of electrochemical sensor through pulse excitation

A pulse excitation, electrochemical technology, applied in scientific instruments, instruments, measuring devices, etc., can solve the problem of sensor life evaluation and diagnosis methods without relevant technical solutions, and achieve the effect of improving work reliability and stability, and ensuring accuracy.

Pending Publication Date: 2021-11-02
CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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Problems solved by technology

[0004] The existing technology only studies the hardware circuit of electrochemical sensor life diagnosis, but there is no relevant technical solution for the sensor life evaluation and diagnosis method

Method used

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  • Method for measuring service life of electrochemical sensor through pulse excitation

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Comparison scheme
Effect test

Embodiment 1

[0042] GTH1000 carbon monoxide sensor for mine uses the carbon monoxide gas sensor of electrochemical principle as the sensitive element. Through the analysis of a large number of samples, the voltage amplitude UI of the key parameters of the pulse excitation is set to 3mV and the pulse width T1 is 100ms; the microprocessor controls the constant voltage UR between the reference electrode (R) and the counter electrode (C) of the electrochemical sensor to be 1100mV, the output current signal of the detection electrode (S) of the electrochemical sensor is 150nA, the output voltage UO of the current signal is 1101.5mV after the signal processing circuit, UO enters the A / D conversion circuit, and the microprocessor reads the A / D conversion result D0 in real time For 1503, the carbon monoxide gas concentration is measured.

[0043] The microprocessor starts the timer, sends the excitation pulse, and the microprocessor reads the A / D conversion result in real time every sampling time ...

Embodiment 2

[0047] GTH1000 carbon monoxide sensor for mine uses the carbon monoxide gas sensor of electrochemical principle as the sensitive element. Through the analysis of a large number of samples, the voltage amplitude UI of the key parameters of the pulse excitation is set to 3mV and the pulse width T1 is 100ms; the microprocessor controls the constant voltage UR between the reference electrode (R) and the counter electrode (C) of the electrochemical sensor to be 1100mV, the output current signal of the detection electrode (S) of the electrochemical sensor is 150nA, the output voltage UO of the current signal is 1101.5mV after the signal processing circuit, UO enters the A / D conversion circuit, and the microprocessor reads the A / D conversion result D0 in real time For 1503, the carbon monoxide gas concentration is measured.

[0048] The microprocessor starts the timer, sends the excitation pulse, and the microprocessor reads the A / D conversion result in real time every sampling time ...

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Abstract

The invention relates to a method for measuring the service life of an electrochemical gas sensor through pulsed excitation, which belongs to the technical field of sensor service life detection and predicts the service life and performance of the electrochemical gas sensor by sending pulsed excitation to the electrochemical sensor and measuring pulse response specific parameters output by the sensor. The pulse excitation key parameters comprise the voltage amplitude UI and the pulse width T1 of the pulse, and the pulse response specific parameters comprise the voltage amplitudes D1, D2... DN of N times of sampling measurement, the maximum value DB1, the second maximum value DB2, the median value DB0, and the health degree alpha of the electrochemical sensor. According to the method, the service life of the electrochemical sensor can be quickly and effectively evaluated, and meanwhile, fault diagnosis is performed on the electrochemical sensor, so that the working reliability and stability of a sensor system comprising the electrochemical sensor are integrally improved. The method ensures the accuracy of monitoring the toxic and harmful gases in the coal mine safety production environment.

Description

technical field [0001] The invention belongs to the field of sensor life detection and relates to a method for measuring the life of an electrochemical sensor with pulse excitation. Background technique [0002] Electrochemical gas sensors have good linear output and measurement accuracy, low power consumption and high resolution, so they are widely used in industrial fields and coal mine fields, especially for the detection of toxic and harmful gases such as carbon monoxide and hydrogen sulfide, and other detection principles Sensors are often unable to achieve miniaturized and high-resolution gas detection, so electrochemical gas sensors play an important role in the detection of industrial and coal mine safety environments. [0003] After more than 20 years of development, the signal processing circuits of electrochemical gas sensors have become more and more streamlined and more scientific, and can be applied to signal processing of various gas components. However, elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/416
CPCG01N27/4163
Inventor 赵庆川孙世岭于庆李军梁光清张远征周德胜王尧罗前刚但强马勤勇李涛郭清华柏思忠王博文于佃秋
Owner CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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