Hydrogen sulfide gas sensing device on basis of optical fiber F-P (Fabry-Perot) interferometer

Abstract

The invention provides a hydrogen sulfide gas sensing device on the basis of an optical fiber F-P (Fabry-Perot) interferometer. The concentration of external hydrogen sulfide gas can be perceived by an optical fiber F-P cavity of the hydrogen sulfide gas sensing device which is a measuring device, and the optical fiber F-P cavity is formed by an optical fiber collimator and a metal groove filled with hydrogen sulfide sensitive organic polymer materials. The refractive index of the organic polymer materials can be changed when the concentration of the external hydrogen sulfide gas is changed, optical paths of transmitted optical waves in the optical fiber F-P cavity can be changed, and accordingly spectral characteristics of interference signals outputted by the optical fiber F-P cavity can be changed. Data of the spectral characteristics of the reflected interference signals of the optical fiber F-P cavity are analyzed, so that the concentration of the hydrogen sulfide gas can be accurately measured. The hydrogen sulfide sensing device has the advantages of simple structure, miniaturization, high sensitivity and precision, electromagnetic interference resistance, intrinsic safety and the like.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, in particular to a hydrogen sulfide gas concentration sensing device based on an optical fiber F-P interferometer. Background technique [0002] Hydrogen sulfide is a colorless, highly toxic, strongly acidic gas. Low-concentration hydrogen sulfide gas has the smell of rotten eggs, burns with a blue flame, and produces sulfur dioxide gas which is very harmful to eyes and lungs. Hydrogen sulfide gas is not only very harmful to the human body, but also has a strong corrosive effect on equipment. Therefore, the detection of hydrogen sulfide gas is particularly important. There are many methods for detecting hydrogen sulfide gas, which are generally divided into electrochemical methods and optical sensor methods. Compared with the traditional electrochemical method, the optical sensor has the advantages of smaller volume, lighter weight, stronger anti-interference ability and better r...

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Problems solved by technology

The evanescent wave optical fiber hydrogen sulfide sensor has unique advantages such as long sensing length, simple structure, and suitable for distributed and long-distance measurement. However, there is a problem of how to solve serious surface pollution. Although a polymer isolation film can be used to prevent large pollutants Enter the evanescent field area, but there are still some molecules with a volume similar to that of hydrogen sulfide gas molecules, which can also enter the evanescent field area through the isolation film, thus affecting the sensitivity of the sensor

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