Concentration calculation method

Abstract

The invention relates to a concentration calculation method, and belongs to the technical field of gas concentration sensing and measurement and control instruments. The method comprises the steps that step 1, measuring environment temperature data and hydrogen concentration data in air; step 2, converting the hydrogen concentration data and the environment temperature data into voltage signals,carrying out filtering, and sending a filtered hydrogen concentration voltage signal and ambient temperature voltage signal to a single-chip microcomputer; step 3, measuring data of hydrogen concentration changing along with temperature in the mixed gas with different concentration ratios; step 4, fitting a temperature compensation coefficient; sending the temperature compensation coefficient to the single-chip microcomputer; step 5, displaying the hydrogen concentration percentage corresponding to a hydrogen concentration flow signal according to the fitting temperature compensation coefficient; displaying a temperature value corresponding to the environment temperature current signal. The method is wide in measurement range, and the highest detection concentration can reach 100%; the broad spectrum property is realized; the sensitivity is high and the response time is short; the stability and the reliability are high; and the effects of simple structure and easy maintenance are realized.

Description

technical field [0001] The invention belongs to the technical field of gas concentration sensing and measurement and control instruments, and relates to a concentration calculation method. Background technique [0002] Gas concentration sensors are widely used in all walks of life. Most gas alarms use electrochemical sensors. However, traditional electrochemical sensors usually have problems such as small detection range of the sensor, cross-effect of the gas to be measured, and zero drift of the sensor. Other analytical equipment, such as semiconductor gas sensors, have high sensitivity but poor stability. Most of their working temperatures are above 300°C and require heating devices. Generally, they can only be used as alarms. Relatively speaking, the thermal conductivity sensor has high reliability and simple device, but there is also the problem that constant temperature detection is required to reduce the error caused by radiation heat dissipation. Therefore, the gas c...

AI Technical Summary

Problems solved by technology

[0003] (1) Poor environmental adaptability, need constant temperature or heating device

[0004] (2) The detection gas is single, and the cross-effect of the gas to be measured

[0005] (3) The measurement concentration range is small, and the response speed is too slow, generally more than 20 seconds

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