Compensation type gas sensor and humiture compensation method thereof

Abstract

The invention provides a compensation type gas sensor and a humiture compensation method thereof. The compensation type gas sensor comprises a microprocessor circuit, a gas sensor, a temperature sensor, a humidity sensor, a gas concentration signal processing circuit, a temperature signal processing circuit, a humidity signal processing circuit and a power supply circuit. The humiture compensation method comprises the following steps of: creating a compensation factor searching database; obtaining a gas concentration measured value C0, a temperature measured value T and a humidity measured value H through actual measurement; searching a compensation factor @ corresponding to the gas concentration measured value C0, the temperature measured value T and the humidity measured value H from the compensation factor searching database according to the gas concentration measured value C0, the temperature measured value T and the humidity measured value H; and obtaining a gas concentration true value C1 of the gas sensor by multiplying the gas concentration measured value C0 with the compensation factor @ according to the searched compensation factor @. The compensation type gas sensor provided by the invention has the advantages of being high in detection accuracy, reliable in performance, and suitable for the high-temperature high-humidity environment detection; and the humiture compensation method provided by the invention has the advantages of being simple and practical, and beneficial for increasing the detection accuracy of the gas sensor.

Description

technical field [0001] The invention relates to a gas sensor, in particular to a compensated gas sensor and a temperature and humidity compensation method thereof. Background technique [0002] The catalytic sensor is a Wheatstone detection bridge composed of two fixed resistors. When the flammable mixed gas diffuses to the detection element, it will burn quickly without flames and generate reaction heat, which will increase the resistance of the heating wire and the electric current will increase. The bridge outputs a changing voltage signal, and the magnitude of this voltage signal is proportional to the concentration of combustible gas; the catalytic sensor has good selectivity, accurate response, good stability, quantitative detection, is not easy to generate false alarms, and is reliable in control. It is mainly suitable for For the detection of combustible gas, at present, most combustible gas detectors in the world use this type of sensor. Although catalytic sensors ...

AI Technical Summary

Problems solved by technology

Although the catalytic sensor has so many advantages, the environment will change the sensitivity of the catalyst in a high temperature and high humidity environment, which will make the measurement accuracy of the catalytic sensor worse.

[0003] In practical applications, it is not difficult to find that the high temperature and high humidity environment will also deteriorate the measurement accuracy of other types of gas sensors, and even cause false alarms.

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