Optical fiber reflection type hydrogen detector

A reflective and detector technology, which is applied in the field of optical fiber reflective hydrogen detectors, can solve the problems of high preparation difficulty, single mechanism, and low hydrogen detection sensitivity, and achieve high sensitivity and easy to change effects

Pending Publication Date: 2022-03-25
ZHEJIANG SHUREN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the thickness of the palladium film has a decisive effect on the sensitivity of hydrogen detection, it is necessary to strictly control the thickness of the palladium film, which is difficult to prepare
In addition, the detection of hydrogen is only realized through the change of the refractive index of the palladium film, the mechanism is single, and the sensitivity of hydrogen detection is low

Method used

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  • Optical fiber reflection type hydrogen detector
  • Optical fiber reflection type hydrogen detector
  • Optical fiber reflection type hydrogen detector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The invention provides an optical fiber reflective hydrogen detector, which includes a light source, an optical circulator, an optical detector, an optical fiber 1 and a palladium film 3 . Fiber 1 is a single-mode fiber. One end of the optical fiber 1 is connected to a light source and a photodetector through an optical circulator, and the other end of the optical fiber 1 is provided with a tapered region 2 . That is, in figure 1 In the figure, the left end of the optical fiber 1 is connected to an optical circulator, and the right end of the optical fiber 1 is provided with a tapered region 2 . exist figure 1 Among them, the left end of the tapered region 2 is connected to the optical fiber 1, and the right end of the tapered region 2, that is, the free end forms the end face 4 of the tapered region. In this embodiment, the single-mode fiber is selected because the core diameter of the single-mode fiber is small. When the tapered single-mode fiber is drawn, the tap...

Embodiment 2

[0026] On the basis of Example 1, the palladium film 3 is arranged in a region close to the end face 4 of the tapered region. The diameter near the end face 4 of the tapered region is small, and when the palladium film 3 absorbs hydrogen and expands, it is more likely to cause the curved tapered region 2 to bend, thereby changing the light reflection characteristics of the tapered region 2 more, thereby realizing high-sensitivity hydrogen detection.

[0027] Furthermore, when the palladium film 3 is set near the end face 4 of the tapered area, the palladium film 3 partially covers the end face 4 of the tapered area, so that when the palladium film 3 absorbs hydrogen, the palladium film on the end face 4 of the tapered area The refractive index of 3 is also changed, thereby more changing the light reflection characteristics of the tapered region 2, so as to realize the detection of hydrogen with higher sensitivity.

Embodiment 3

[0029] On the basis of Example 2, such as figure 2 As shown, an elastic transparent part 5 is also included, and the elastic transparent part 5 is arranged on the end surface 4 of the tapered region, and the palladium film 3 extends to the elastic transparent part 5 . The end surface of the elastic transparent part 5 has the same shape as the end surface 4 of the tapered region, and the elastic transparent part 5 is fixed on the end surface 4 of the tapered region. The elastic transparent part 5 is made of PMMA. In this way, the light in the tapered region 2 can propagate into the elastic transparent part 5 . like figure 2 As shown, a part of the palladium film 3 covers the side of the tapered region 2 , and a part of the palladium film 3 covers the side of the elastic transparent part 5 . Because the elasticity of the elastic transparent part 5 is greater than the elasticity of the tapered region 2, when the palladium film 3 absorbs hydrogen and expands, the elastic tran...

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Abstract

The invention relates to the technical field of hydrogen detection, in particular to an optical fiber reflection type hydrogen detector which comprises a light source, an optical circulator, an optical detector, an optical fiber and a palladium film, one end of the optical fiber is connected with the light source and the optical detector through the optical circulator, the other end of the optical fiber is provided with a tapering area, and the free end of the tapering area forms a tapering area end face. And the palladium membrane is arranged on one side of the tapering area. During application, laser emitted by the light source is transmitted to the optical fiber through the optical circulator, the light is transmitted to the tapering area along the optical fiber and is reflected in the tapering area, and the reflected light enters the optical detector after passing through the optical fiber and the optical circulator. The palladium film changes the shape and the refractive index environment of the tapering area, so that the reflection characteristic of the tapering area is changed; and hydrogen or hydrogen concentration detection is realized by detecting the change of the reflection characteristic of the tapering region. According to the invention, hydrogen detection with higher sensitivity can be realized, and the method has a good application prospect in the field of hydrogen detection.

Description

technical field [0001] The invention relates to the technical field of hydrogen gas detection, in particular to an optical fiber reflection type hydrogen gas detector. Background technique [0002] Hydrogen is an important chemical raw material and an important clean energy. Hydrogen has been widely used. In the aerospace industry, hydrogen has become the main fuel for spacecraft engines. In addition, hydrogen is also the main industrial raw material, the most important industrial gas and special gas, and has a wide range of applications in petrochemical, electronic industry, metallurgical industry, food processing, float glass, fine organic synthesis, aerospace and other fields. [0003] Due to the small size of hydrogen molecules, hydrogen is easily leaked during storage. When the hydrogen content in the air reaches more than 4%, an explosion may occur. In addition, hydrogen leakage will shorten the life of related equipment. Therefore, with the increasing application...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/47
CPCG01N21/4738G01N2021/4742
Inventor 邵雅斌陈晨
Owner ZHEJIANG SHUREN UNIV
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