Gas leakage detection method based on carbon dioxide sensor

Abstract

The invention discloses a gas leakage detection method. The gas leakage detection method based on a carbon dioxide sensor comprises the steps of sealing a workpiece to be detected in a container which is excellent in airtight property and constant-temperature and is provided with a carbon dioxide gas sensor, performing vacuum processing on the workpiece to be detected and the container, introducing pure carbon dioxide into the workpiece to be detected under certain pressure, periodically collecting the concentration of carbon dioxide gas in the container by the sensor, performing digitalization processing on an amplified concentration signal and inputting the concentration signal after digitalization processing to an upper computer which is a virtual instrument, and denoising digital signals which are subjected to various noise interferences; obtaining the concentration value, in the detection beginning, in the container and the concentration value, in detection finishing, in the container according to the denoised carbon dioxide, and calculating the leakage amount of the workpiece to be detected according to a formula. The gas leakage detection method is convenient, reliable and low-cost in detection processes.

Description

technical field [0001] The invention relates to the detection field of trace gas leakage, in particular to a gas leakage detection method based on a carbon dioxide sensor. Background technique [0002] With the rapid development of modern industrial production, various sealing devices are widely used in various fields, such as aviation, automobile, medical industry, civil equipment, etc. People have higher and higher requirements for the quality and performance of sealed devices, which puts forward higher requirements for the detection methods of sealed products. [0003] According to the different detection principles, gas leakage detection methods are divided into dry type and wet type. The wet leak detection method is also called the water method. It refers to filling the test piece with air and putting it into water to observe whether there are bubbles. The degree of leakage can be judged by the number of bubbles generated within a certain period of time. This method i...

AI Technical Summary

Problems solved by technology

Flow type leak detection method, halogen leak detection method, helium mass spectrometry leak detection method and ultrasonic detection method are mostly limited to qualitative detection, quantitative detection cannot be achieved, detection efficiency is not high, and testing equipment is expensive