Michelson interference type hydrogen sulfide sensor based on cladding-coated sensitive film

Abstract

The invention discloses a Michelson interference type hydrogen sulfide sensor based on a cladding-coated sensitive film. Each of two ends of endless-wavelength photonic crystal optical fiber is weldedwith a single-mode optical fiber end surface, and the welded tapering is performed at one end close to a light source, so that a collapse layer is comparatively long and the interference is enhanced;the other end is normally welded to form the collapse layer, and the other end of the single-mode optical fiber is connected with a Faraday polariscopy, thereby forming a sensor in a Michelson structure. The Cu / rGO sensitive film is coated at the photo crystal optical fiber cladding. The sensor provided by the invention has obvious selectivity on the hydrogen sulfide gas, in the range that the hydrogen sulfide concentration is 0-70ppm, the interference spectrum represents obvious red shift along with the continuous increasing of the detected gas concentration, the linearity is good, and the response recovery time is respectively 70s and 88s. The sensor disclosed by the invention is low in cost, high in sensitivity, strong in selectivity, simple in structure and suitable for the low-concentration hydrogen sulfide gas sensitivity detection.

Description

technical field [0001] The invention relates to the technical field of hydrogen sulfide sensors, in particular to a Michelson interference hydrogen sulfide sensor based on a cladding coated sensitive film. Background technique [0002] Hydrogen sulfide (hydrogen sulfide, abbreviated as: H 2 S) is a colorless, flammable, toxic gas with a smell of rotten eggs. The natural fat-dissolving properties of hydrogen sulfide make it very easy to be absorbed by the body, the main route is the lungs, and it acts on the blood and heart. The gas is common in sewers, reservoirs, petrochemical plants, heavy water production, agriculture and hot springs, and corresponding poisoning incidents also occur from time to time. At present, domestic and foreign 2 Sensors such as metal oxide semiconductor type, electrochemical solid electrolyte type, electrochemical polymer electrolyte type, and thermal resistance type are commonly used for S detection, but there are still certain problems in term...

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Problems solved by technology

At present, domestic and foreign 2 Sensors such as metal oxide semiconductor type, electrochemical solid electrolyte type, electrochemical polymer electrolyte type, and thermal resistance type are commonly used for S detection, but there are still some problems in terms of selectivity, stability, and reliability.

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