A device for detecting hydrogen sulfide gas based on optical fiber m-z interferometer

Abstract

The invention relates to the technical field of optical fiber sensing, in particular to a device based on an optical fiber M-Z interferometer to detect hydrogen sulfide gas. The device comprises a laser device, a sensitive optical path structure and a signal processing module, the laser device is used for generating a laser source, the sensitive optical path structure is arranged at an output end of the laser device and comprises a first coupler, a gas chamber filled with the hydrogen sulfide gas and a second coupler, and two optical paths are arranged in the gas chamber and include a full-optical-fiber reference transmission arm optical path and a measuring transmission arm optical path composed of a V-shaped groove filled with an organic compound sensitive to the hydrogen sulfide gas and optical fiber collimation heads at two ends; the laser source splits a light beam into two beams of light through the first coupler, one beam of light is output through the reference transmission arm optical path, another beam of light is output through the measuring transmission arm optical path, the beams of light enter the second coupler to output three beams of light; the signal processing module is arranged at an output end of the second coupler and used for performing photoelectric signal conversion according to light beam output by the second coupler and utilizing a phase demodulation algorithm to calculate to acquire concentration of the hydrogen sulfide gas. By the device, measuring sensitivity is improved.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a device for detecting hydrogen sulfide gas based on an optical fiber M-Z 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 radiation...

AI Technical Summary

Problems solved by technology

[0007] The embodiment of the present invention provides a device for detecting hydrogen sulfide gas based on an optical fiber M-Z interferometer, which solves the technical problems that the existing sensor for detecting hydrogen sulfide gas has a complex structure, strong professional operation, and low sensitivity

Images