Gas detection method and system

Abstract

The invention discloses a gas detection method and system. The gas detection system comprises the following parts that an optical path unit is used for generating two paths of same optical signals; agas chamber unit is divided into a reference gas chamber and a measurement gas chamber which are isolated from each other, wherein reference gas with preset concentration is sealed in the reference gas chamber, and the measurement gas chamber is communicated with the environment where external gas to be measured is located; the two paths of same optical signals respectively enter the reference gaschamber and the measurement gas chamber, the two paths of optical signals are attenuated to different extents after being absorbed by the reference gas chamber and the measurement gas chamber, and the reference gas is the same as the external gas to be measured in type; and a detection unit is used for detecting the two paths of optical signals absorbed by the reference gas chamber and the measurement gas chamber, and determining the concentration of the external gas to be measured according to the intensity of the two paths of optical signals and the concentration of the reference gas. Measurement errors caused by light source optical power jitter and external environment noise are reduced, and the detection precision and sensitivity of the system are improved.

Description

technical field [0001] The present invention relates to the technical field of gas detection, and more particularly, to a gas detection method and system. Background technique [0002] Most of the current fiber optic gas sensors are based on the principle of spectral absorption of gases. According to the different physical quantities detected, it can be divided into two categories: direct spectral absorption and indirect absorption. The direct spectral absorption optical fiber gas sensor uses a light source corresponding to a certain gas absorption line or a certain group of absorption lines to directly detect the change of optical power after gas absorption, thereby obtaining the gas concentration. The principle of the direct spectral absorption fiber optic gas sensor is: the light source emits a beam of light, which is incident into the gas through the optical fiber, a part of the light is absorbed by the gas, and the detector performs photoelectric conversion, and then t...

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Problems solved by technology

[0006] In view of the defects of the prior art, the purpose of the present invention is to solve the problem that the measurement gas absorption gas chamber and the reference gas chamber used in some optical fiber gas absorption detection systems are relatively large in volume, and the physical environments in which the two may be different may cause problems. Detect technical issues that introduce errors

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