Ultralong Fabry-Parot interferent gas sensor and gas tester based on the sensor

A technology of gas sensor and gas tester, which is applied in the field of gas tester, can solve the problems of easy pollution, light source fluctuation, long gas chamber volume, etc., and achieve the effect of easy networking, good stability and simple system

Inactive Publication Date: 2009-03-18
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of existing optical fiber gas sensors, such as long gas chamber volume, easy to be polluted, large coupling loss, easily affected by light source fluctuations, unable to measure the composition and concentration of the gas to be measured at the same time, and difficult to network for distributed multi-point Measurement and other shortcomings, the present invention proposes an ultra-long FA-P interferometric gas sensor and its manufacturing method and a gas tester based on the ultra-long FA-P interferometric gas sensor

Method used

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  • Ultralong Fabry-Parot interferent gas sensor and gas tester based on the sensor
  • Ultralong Fabry-Parot interferent gas sensor and gas tester based on the sensor
  • Ultralong Fabry-Parot interferent gas sensor and gas tester based on the sensor

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Embodiment 1

[0021] Embodiment 1: In the case of processing air-permeable microholes 7 on the hollow-core photonic crystal fiber 2, the air-permeable microholes 7 that are distributed in an array can be directly processed radially on the hollow-core photonic crystal fiber 2, such as figure 1 shown.

Embodiment 2

[0022] Embodiment 2: In the case of processing the air-permeable microhole 7 on the single-mode optical fiber 1, in this embodiment, it is also necessary to process the microhole 8 at the end of the single-mode optical fiber 1 and the hollow-core photonic crystal fiber 2 fusion, and the microhole 8 The end face of the single-mode optical fiber 1 is coated with a reflective film; the air-permeable microholes 7 distributed in an array are radially processed on the cladding of the single-mode optical fiber 1, and the core of the hollow-core photonic crystal fiber 2 communicates with the outside world through the microholes 8 and the air-permeable microholes 7 ,like figure 2 shown.

[0023] Because the laser has good focusing performance, it can make the light spot converge to the wavelength level, concentrate high energy in a small area, and the heat-affected area is small, so as to realize "cold processing" in a relative sense. Therefore, an array of gas inlet and outlet micro...

Embodiment 3

[0027] attached image 3 It is a structural schematic diagram of an embodiment of a gas tester based on an ultra-long FA-P interferometric gas sensor in the present invention. The gas tester includes a frequency-sweeping laser 9, an optical coupler 10, a sensing interference cavity 11 and a reference interference cavity 12 using an ultra-long FA-P interferometric gas sensor, a photodetector 13, a data receiving and signal processing circuit 14 and Monitoring computer 15.

[0028] It can be seen from the figure that the frequency-sweeping laser 9 is used as an optical signal source, and its input wavelength range can be selected according to the short section near the strongest absorption peak of the gas to be measured. Its wavelength bandwidth is very narrow, and can almost be treated as a single wavelength. After the light emitted by the frequency-sweeping laser 9 passes through the ordinary optical fiber, the light is divided into two beams by the optical coupler 10. One be...

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Abstract

The invention discloses a super-long fabry-perot interferometer gas sensor, which is characterized in that two ends of a hollow-core photonic crystal fiber are fused and jointed with single mode fibers, the core of the hollow-core photonic crystal fiber and the external condition are communicated by the permeable microporous on the optical fiber. The invention further discloses a gas tester adopting the super-long fabry-perot interferometer gas sensor, comprising a frequency sweeping laser, an optical coupler, an induction interferometer cavity adopting a super-long fabry-perot interferometer gas sensor, an interference interferometer cavity, a photoelectric detector, a data receiving and signal processing circuit and a monitoring computer. The invention has the advantages of low cost, small volume, simple system, safety, reliability, high stability, batch production, easy networking, and the application for the component recognition of various mixed gases and high-sensitivity density detection and the like.

Description

technical field [0001] The invention relates to an optical fiber sensing technology, in particular to an ultra-long FA-P interference gas sensor and a gas tester using the ultra-long FA-P interference gas sensor. Background technique [0002] Various harmful gases (such as methane, NH 3 , CO 2 、H 2 The monitoring of S) concentration is of great significance to economic development and social progress. Take gas (also known as methane, biogas) as an example. In recent years, coal mine safety accidents have occurred frequently, and the casualties caused by gas explosions in mines are even more shocking. From 2001 to 2004, a serious accident that killed more than 10 people Among them, gas accidents accounted for 80%; in a particularly serious accident with more than 30 deaths, gas accidents accounted for 83%. The occurrence of these accidents brought great loss to the life and property of the country and the people, produced many family tragedies, and affected the stability ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/45
Inventor 饶云江朱涛
Owner CHONGQING UNIV
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