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Multiplexing optical fiber hydrogen sensor rapid to respond in low temperature environment

A low-temperature environment, fast-response technology, applied in the measurement of color/spectral characteristics, etc., can solve the problem of limiting sensor multiplexing, and achieve the effect of speeding up the response speed, speeding up the speed, and improving the multiplexing ability.

Active Publication Date: 2015-07-08
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The heating effect of this solution is good, but the high-attenuation fiber has strong attenuation for all wavelengths of light, which also limits the multiplexing of sensors

Method used

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  • Multiplexing optical fiber hydrogen sensor rapid to respond in low temperature environment
  • Multiplexing optical fiber hydrogen sensor rapid to respond in low temperature environment
  • Multiplexing optical fiber hydrogen sensor rapid to respond in low temperature environment

Examples

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Embodiment 1

[0028] Such as figure 1 As shown, this embodiment discloses a fast response multiplexable optical fiber hydrogen sensor in a low temperature environment, including a broadband light source 1, a pump light source 4, a spectrum analyzer 3, an optical circulator 2, a wavelength division multiplexer 5 and The sensing unit 6, wherein the wavelength of the optical signal output by the broadband light source 1 is around 1550nm, which is 1530-1560nm, and the pumping light source 4 is a semiconductor laser, and the wavelength of the output pumping light is 980nm.

[0029] The optical circulator 2 includes three ports, namely port 1, port 2 and port 3, such as figure 2 As shown, the wavelength division multiplexer 5 includes three ports, namely port a, port b and port c.

[0030]Port 1 of the optical circulator 5 and the broadband light source are fused through optical fiber, port 2 of the optical circulator 2 is fused with port a of the wavelength division multiplexer 5 through optic...

Embodiment 2

[0039] Such as image 3 As shown, the difference between this embodiment and Embodiment 1 is that one or more second wavelength division multiplexers 31 are connected to the monitoring optical path of the sensing unit 6, wherein each second wavelength division multiplexer 31 Connected between the erbium-ytterbium co-doped optical fibers, each second wavelength division multiplexer 31 is connected to the pumping light source 4 through a coupler 7, and the pumping light source 4 inputs the pumping light source to the second through each coupler 7. In the wavelength division multiplexer 31, through the second wavelength division multiplexer 31 and the coupler 7, the pump light is coupled between the erbium-ytterbium co-doped optical fibers to perform branch pumping, which can improve the multiplexing capability of the network. The number of second wavelength division multiplexers 31 is selected according to actual needs, and two second wavelength division multiplexers 31 are conn...

Embodiment 3

[0041] Such as Figure 4 As shown, the difference between this embodiment and Embodiment 1 is that a third wavelength division multiplexer 41 is connected to the end of the monitoring optical path of the sensing unit 6, that is, one end of the last erbium-ytterbium optical fiber in the sensing unit 6 Connect the third wavelength division multiplexer 41, the third wavelength division multiplexer 41 is connected with the pumping light source 4, the pumping light source 4 is coupled into the pumping light at the end of the sensing unit 6 through the third wavelength division multiplexer 41 , to perform bidirectional pumping to increase the intensity of the pumping light of the sensing unit, so as to further improve the networking multiplexing capability of this embodiment.

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Abstract

The invention discloses a multiplexing optical fiber hydrogen sensor rapid to respond in the low temperature environment, which comprises a broadband light source, a pumping light source, a spectrum analyzer, an optical circulator, a wavelength division multiplexer and a sensing unit. The optical circulator is respectively connected with the broadband light source, the spectrum analyzer and the wavelength division multiplexer; an optical signal output by the broadband light source is transmitted to the wavelength division multiplexer by the optical circulator; the pumping light source is connected with the wavelength division multiplexer; the sensing unit is formed by consisting a plurality of Er-Yb co-doped optical fibers in series; Bragg gratings with different Bragg wavelengths are marked in each Er-Yb co-doped optical fiber; the surface of each grating region is plated with a palladium film; the sensing unit is connected with the wavelength division multiplexer; an optical signal output by the pumping light source and the optical signal output by the broadband light source are input into the sensing unit after being coupled by the wavelength division multiplexer; and an optical signal reflected by the sensing unit is transmitted to the spectrum analyzer by the wavelength division multiplexer and the optical circulator. The multiplexing optical fiber hydrogen sensor has the advantages of high response speed and strong multiplexing capability at a low temperature and is suitable for spatial measurement on hydrogen concentration at the low temperature.

Description

technical field [0001] The invention relates to an optical fiber hydrogen sensor, in particular to a reusable optical fiber hydrogen sensor with rapid response in a low temperature environment. Background technique [0002] As an efficient, clean and renewable energy, hydrogen energy has been widely used in aviation, automobile, chemical industry and other fields. However, due to the smallest volume of hydrogen molecules, it is easy to leak during storage, and under normal temperature and pressure, when hydrogen accounts for 4% of the number of atoms in the air, it may cause an explosion. Therefore, there is an urgent need for a safe, reliable and highly sensitive hydrogen sensor for monitoring hydrogen leakage. Traditional hydrogen sensors are mainly based on electrochemical principles. The connection between the sensor and the monitoring element is realized through copper wires, which not only increases the weight of the payload and power consumption, but also increases t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/25
Inventor 关柏鸥齐麟金龙
Owner JINAN UNIVERSITY