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Hydrogen detector based on elastic optical fiber

A technology of optical detectors and detectors, applied in color/spectral characteristic measurement, instruments, measuring devices, etc., can solve the problems of high manufacturing process requirements, thinning optical fibers, etc., achieve high sensitivity and ensure firmness

Pending Publication Date: 2022-04-29
ZHEJIANG SHUREN COLLEGE ZHEJIANG SHUREN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the optical fiber hydrogen detector based on the waveguide structure achieves high hydrogen detection sensitivity, it needs to thin the optical fiber and control the thickness of the palladium film with high requirements, which has high requirements for the preparation process.

Method used

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  • Hydrogen detector based on elastic optical fiber
  • Hydrogen detector based on elastic optical fiber
  • Hydrogen detector based on elastic optical fiber

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The invention provides a hydrogen detector based on elastic optical fiber. The elastic optical fiber-based hydrogen detector includes a light source, a photodetector, a substrate 1 , an elastic layer 2 , a first elastic optical fiber 3 , a second elastic optical fiber 4 , and a palladium film 6 . Such as figure 1 As shown, the elastic layer 2 is placed on the substrate 1 . The material of the substrate 1 is not limited. The substrate 1 can be used for fixing, and a suitable material for the substrate 1 is selected so as to fix the device on a certain component. The material of the elastic layer 2 is PMMA, and the thickness of the elastic layer 2 is greater than 100 microns, so that the elastic layer 2 has higher elasticity. The first elastic optical fiber 3 and the second elastic optical fiber 4 are placed on the elastic layer 2 . The first elastic optical fiber 3 and the second elastic optical fiber 4 are plastic optical fibers. Plastic optical fiber is a type of ...

Embodiment 2

[0028] On the basis of Embodiment 1, the end surfaces of the first elastic optical fiber 3 and the second elastic optical fiber 4 are tapered. That is, the first elastic optical fiber 3 and the second elastic optical fiber 4 gradually become thinner along the direction from the first elastic optical fiber 3 to the gap 5 and along the direction from the second elastic optical fiber 4 to the gap 5 . The tapered end face reduces the relative area of ​​the first elastic optical fiber 3 and the second elastic optical fiber 4, when the distance between the first elastic optical fiber 3 and the second elastic optical fiber 4 changes, the first elastic optical fiber 3 and the second elastic optical fiber The coupling characteristics between the fibers 4 change more. That is to say, the coupling characteristics or propagation characteristics of the first elastic optical fiber 3 to the second elastic optical fiber 4 depend more heavily on the distance between the two, so as to realize h...

Embodiment 3

[0030]On the basis of Embodiment 2, at the gap 5 , a pit is provided on the surface of the elastic layer 2 , and the ends of the first elastic optical fiber 3 and the second elastic optical fiber 4 are suspended. When the ends of the first elastic optical fiber 3 and the second elastic optical fiber 4 are suspended, the ends of the first elastic optical fiber 3 and the end of the second elastic optical fiber 4 are no longer in contact with the elastic layer 2, reducing the size of the first elastic optical fiber 3 , the adhesion or force of the second elastic optical fiber 4 and the elastic layer 2, so that when the palladium membrane 6 expands, the first elastic optical fiber 3 and the second elastic optical fiber 4 expand more, and change the gap 5 more. Width, so as to achieve higher sensitivity hydrogen detection. Furthermore, the width of the pit is greater than the width of the palladium film 6 on the first elastic optical fiber 3 and the second elastic optical fiber 4, ...

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Abstract

The invention relates to the technical field of hydrogen detection, in particular to a hydrogen detector based on an elastic optical fiber, which comprises a light source, a light detector, a substrate, an elastic layer, a first elastic optical fiber, a second elastic optical fiber and a palladium film, the elastic layer is arranged on the substrate, and the first elastic optical fiber and the second elastic optical fiber are arranged on the elastic layer. A gap is arranged between the end faces of the first elastic fiber and the second elastic fiber, palladium films are arranged on the upper end faces of the first elastic fiber and the second elastic fiber, the other end of the first elastic fiber is connected with a light source, and the other end of the second elastic fiber is connected with a light detector. During application, the palladium membrane adsorbs hydrogen to be detected to generate expansion, and the width of the gap is changed, so that the propagation characteristic between the first elastic optical fiber and the second elastic optical fiber is changed; and hydrogen detection is realized by detecting the change of propagation characteristics. Only the optical fiber needs to be cut, the requirement for the accuracy of the thickness of the palladium film is not high, application and popularization are convenient, and good application prospects are achieved in the field of hydrogen detection.

Description

technical field [0001] The invention relates to the technical field of hydrogen detection, in particular to a hydrogen detector based on an elastic optical fiber. Background technique [0002] Hydrogen is a colorless gas less dense than air and much lighter than air in the same volume. Hydrogen is the main industrial raw material and the most important industrial and specialty gas. In addition, hydrogen is also used as fuel due to its rich resources, high calorific value, and cleanliness. [0003] Hydrogen has a small molecular weight and is easy to leak. When the volume fraction in air is 4%-75%, it can cause an explosion when encountering a fire source. Although hydrogen is non-toxic and physiologically inert to the human body, if the hydrogen content in the air increases, it will cause hypoxic asphyxia. As the application of hydrogen becomes more and more extensive, the high-sensitivity detection of low-concentration hydrogen is of great significance. [0004] The op...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/01G01N21/25
CPCG01N21/01G01N21/25G01N2201/088
Inventor 邵雅斌陈晨贾炀王君李强于海龙刘佳
Owner ZHEJIANG SHUREN COLLEGE ZHEJIANG SHUREN UNIV
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