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Resonant cavity type optical fiber gas sensor

A gas sensor, resonant cavity technology, applied in the direction of color/spectral characteristic measurement, etc., can solve the problem of low detection sensitivity

Inactive Publication Date: 2021-05-11
于孟今
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the detection sensitivity of existing gas sensors based on the photoacoustic effect is low

Method used

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  • Resonant cavity type optical fiber gas sensor
  • Resonant cavity type optical fiber gas sensor
  • Resonant cavity type optical fiber gas sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The invention provides a resonant cavity optical fiber gas sensor, such as figure 1 As shown, it includes a cavity wall 1 , an air inlet 2 , an air outlet 3 , a light transmission hole 4 , a fiber core 5 , a cavity 6 , and a first noble metal layer 7 . The chamber wall 1 encloses a closed chamber, and the chamber wall 1 is made of a dielectric material. The fiber core 5 runs through the chamber. That is, the core 5 penetrates the opposite face of the chamber. exist figure 1 , the core 5 penetrates the top and bottom surfaces of the chamber. Inside the cavity, the surface of the core 5 is provided with a cavity 6 . The cross section of the core 5 is circular. The boundary of the section of the cavity 6 is composed of arcs and line segments. The first noble metal layer 7 is disposed on the top of the cavity 6 , and the first noble metal layer 7 does not completely cover the cavity 6 . The material of the first noble metal layer 7 is gold or silver. The broadband o...

Embodiment 2

[0025] On the basis of Example 1, such as figure 2 As shown, a second noble metal layer 8 is also included, and the second noble metal layer 8 is disposed at the bottom of the cavity 6 . The material of the second noble metal layer 8 is gold. In this way, the first noble metal layer 7 and the second noble metal layer 8 are placed in the cavity 6, that is, placed in the resonant cavity. Under the action of air flow, the first noble metal layer 7 bends, thereby changing the distance between the first noble metal layer 7 and the second noble metal layer 8 , thereby changing the resonant frequency of the resonant cavity, thereby changing the transmission characteristics of the fiber core 5 . Because surface plasmon polaritons are formed between the first noble metal layer 7 and the second noble metal layer 8, the surface plasmon polaritons significantly depend on the distance between the first noble metal layer 7 and the second noble metal layer 8, Therefore, this design can re...

Embodiment 3

[0028] On the basis of Example 1, such as image 3 As shown, noble metal particles 9 are also included, and the noble metal particles 9 are placed at the bottom of the cavity 6 . The material of noble metal particles 9 is gold. Under laser excitation, surface plasmon resonance is easily formed on the noble metal particle 9 , and the surface plasmon resonance is more significantly dependent on its surrounding environment. Under the action of air flow, the first noble metal layer 7 bends, thereby changing the distance between the first noble metal layer 7 and the noble metal particles 9 , thereby realizing gas detection with higher sensitivity.

[0029] Furthermore, the fiber core 5 is attached to the cavity wall 1, and the cavity 6 faces the cavity. In this way, under the action of the airflow, the fiber core 5 does not move, and only the first noble metal layer 7 is deformed, thereby reducing the influence of the movement of the fiber core 5 on the transmission spectrum and ...

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Abstract

The invention relates to the field of gas detection, and particularly provides a resonant cavity type optical fiber gas sensor which comprises a cavity wall, a gas inlet, a gas outlet, a light hole, a fiber core, a cavity and a first precious metal layer, the cavity wall encloses a closed chamber, the fiber core penetrates through the chamber, the cavity is on the surface of the fiber core in the chamber, the first precious metal layer is arranged at the top of the cavity, the gas inlet and the gas outlet are formed in the side face of the cavity wall, and the light hole is formed in the top face of the chamber. The gas sensor has the advantage of high gas detection sensitivity.

Description

technical field [0001] The invention relates to the field of gas detection, in particular to a resonant cavity type optical fiber gas sensor. Background technique [0002] Gas detection, especially selective gas detection technology has important applications in medical and industrial fields. The gas detection technology based on the photoacoustic effect has the advantage of strong selectivity, and has a good prospect in the field of gas sensing. However, the detection sensitivity of existing gas sensors based on the photoacoustic effect is low. Contents of the invention [0003] In order to solve the above problems, the present invention provides a resonant cavity optical fiber gas sensor, which includes a cavity wall, an air inlet, an air outlet, a light-transmitting hole, a fiber core, a cavity, and a first precious metal layer, and the cavity wall forms a closed cavity In the chamber, the surface of the fiber core is provided with a cavity, the first noble metal laye...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25
CPCG01N21/25
Inventor 不公告发明人
Owner 于孟今
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