F-P interference type multipoint measurement hydrogen sensor based on FBG interrogator

Abstract

The invention relates to an F-P interference type multipoint measurement hydrogen sensor based on an FBG interrogator. The F-P interference type multipoint measurement hydrogen sensor based on the FBGinterrogator comprises the FBG interrogator, a long-distance single-mode transmission optical fiber, an arrayed waveguide grating, an FP sensing head and a PC; the FP sensing head is composed of a hollow optical fiber, a PDMS (polydimethylsiloxane) thin film and a Pt / WO3 (platinum-loaded tungsten trioxide ) hydrogen-sensitive material; when hydrogen concentration is increased, the Pt / WO3 hydrogen-sensitive material reacts with hydrogen to release heat, volume of the PDMS thin film is expanded, length of an air-filled cavity is reduced, an interference spectrum of the FP sensing head can drift, then reflected light intensity of the arrayed waveguide grating is changed, and measurement on the hydrogen concentration can be realized by detecting change of the reflected light intensity by virtue of the PC. The F-P interference type multipoint measurement hydrogen sensor provided by the invention is simple in structure and high in sensitivity and can measure multiple points at the same time.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, in particular to an F-P interference type multi-point measuring hydrogen sensor based on an FBG demodulator. Background technique [0002] Hydrogen, as a clean, sustainable and non-polluting new energy, has attracted widespread attention in solving the energy crisis. The product of hydrogen combustion is only water without any harmful substances. It is a kind of clean energy and has a wide range of applications in the field of production and life. However, due to the high diffusion coefficient, low ignition energy, high combustion heat and wide explosion concentration range (4% to 75%) of hydrogen, it is also very easy to leak from the container and even explode in the air. Therefore, in order to use hydrogen safely, It is extremely important to detect and monitor the hydrogen concentration. Traditional electrical sensors are prone to electric sparks and hydrogen explosions, while...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the disadvantages of the existing optical fiber hydrogen sensor, such as low sensitivity and complicated structure, and F-P interference type sensor which cannot measure multiple points at the same time, the present invention proposes a kind of high sensitivity, simple operation, flexible and convenient, which can measure multiple points at the same time and is applicable to remote F-P interferometric multi-point measurement hydrogen sensor based on FBG demodulator for distance measurement

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