Optical fiber sensor for simultaneously measuring concentration and temperature of hydrogen gas

Abstract

The invention provides an optical fiber sensor for simultaneously measuring the concentration and temperature of hydrogen gas. The optical fiber sensor comprises a light source part, a light transmitting part, a sensing part, a gas supply part and a photodetector part; the sensing part comprises an optical fiber environment and a photonic crystal optical fiber, wherein the optical fiber environment comprises a 3dB coupler and a high-birefringence optical fiber; the sensing part is arranged inside the gas supply part; an output end of a broadband light source and an input end of an optical spectrum analyzer are connected with the 3dB coupler respectively through single-mode optical fibers; two ends of the high-birefringence optical fiber are connected with two ends of the 3dB coupler respectively through single-mode optical fibers; and the single-mode optical fiber for connecting the optical spectrum analyzer with the 3dB coupler is connected with a section of photonic crystal optical fiber, the periphery of the photonic crystal optical fiber is coated with a hydrogen-sensitive film, and subsidence areas are arranged at two ends of the photonic crystal optical fiber respectively. The combination of the optical fiber environment and the photonic crystal optical fiber can realize high-sensitivity and remote real-time detection of the concentration and temperature of a gas, and increase the safety of monitoring the hydrogen gas.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing and relates to an optical fiber sensor for simultaneous measurement of hydrogen gas concentration and temperature based on the combination of photonic crystal optical fiber and optical fiber loop mirror. Background technique [0002] Hydrogen is a clean and reusable energy that is widely used in various fields such as the automobile industry, aerospace, and chemical processing. Due to the high diffusivity of hydrogen (0.16cm 2 / s), low ignition point (0.018mJ) and wide explosion range (4%-75%), hydrogen is very easy to leak and cause an explosion. It can be seen that the research and development of materialized hydrogen sensing technology is the primary condition for the study of hydrogen energy, the utilization of hydrogen energy and the prevention of hydrogen hazards. The sensing signal of the traditional electrochemical sensor is an electrical signal, which has the potential dan...

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Problems solved by technology

The sensitivity of measuring hydrogen in the article is low, and the temperature sensitivity of the fiber Bragg grating used as temperature compensation is relatively low, which cannot well eliminate the influence of temperature cross-sensitivity

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