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A Long-Distance Point Sensing System Based on Optical Fiber Random Laser

A random laser, long-distance technology, applied in the direction of using optical devices to transmit sensing components, can solve problems such as complex system architecture devices, and achieve the effect of structural orders

Active Publication Date: 2016-04-06
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above implementation methods generally require complex system architecture and expensive devices

Method used

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  • A Long-Distance Point Sensing System Based on Optical Fiber Random Laser
  • A Long-Distance Point Sensing System Based on Optical Fiber Random Laser
  • A Long-Distance Point Sensing System Based on Optical Fiber Random Laser

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] See figure 1 , A long-distance point-sensing system based on fiber random laser, which is a point-sensing system based on first-order random laser, the system includes pump laser 1, wavelength division multiplexer 2, long-distance single-mode fiber 3 , The wavelength selection device 4, the wavelength selection device 4 is preferably a fiber Bragg grating (FBG); the pump laser 1 is connected to port 1 of the wavelength division multiplexer 2, and the common port of the wavelength division multiplexer 2 is connected to a long distance single One end of the long-distance single-mode fiber 3 and the other end of the long-distance single-mode fiber 3 are connected to the wavelength selection device 4. The 2-port of the wavelength division multiplexer 2 is connected to the wavelength demodulation module 5. The wavelength demodulation module 5 can obtain long-distance sensing Detection volume.

[0017] image 3 It is the temperature response graph of the FBG sensor based on the ...

Embodiment 2

[0020] See figure 2 , A long-distance point sensing system based on fiber random laser, which is equivalent to a point sensing system based on second-order random laser. The components include pump laser 1, wavelength division multiplexer 2, and wavelength selection device 4 , Long-distance single-mode fiber 3, wavelength selection device 4; the pump laser 1 is connected to port 1 of the wavelength division multiplexer 2, and the common port of the wavelength division multiplexer 2 is connected to the wavelength selection device 4 first, and then the wavelength The selection device 4 is then connected to one end of the long-distance single-mode fiber 3, the other end of the long-distance single-mode fiber 3 is then connected to the wavelength selection device 4, and the 2-port of the wavelength division multiplexer 2 is connected to the wavelength demodulation module 5.

[0021] For a long-distance point-sensing system based on random lasers, the detection steps are: turn on the ...

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Abstract

The invention discloses a long-distance point sensing system based on optical fiber random laser, including a pump laser, a wavelength division multiplexer or a coupler, a long-distance single-mode optical fiber, a wavelength selection device for sensing, and a A wavelength selective device and a wavelength demodulation module for improving random laser generation efficiency, the wavelength division multiplexer or coupler includes 1 port, a common port and 2 ports, wherein the pump laser and the wavelength division multiplexer or coupler 1 port connection, one end of the long-distance single-mode fiber is connected to the common port of the wavelength division multiplexer or coupler, and the other end of the long-distance single-mode fiber is connected to multiple wavelength selection devices for sensing, wavelength division multiplexer Or the 2 ports of the coupler are connected to the wavelength demodulation module. The structure of the present invention does not require complex system architecture and expensive devices. When in use, turn on the pump laser and adjust the output power of the pump laser to a suitable range. Then the long-distance transmission can be obtained through the wavelength demodulation module. Sensing amount.

Description

Technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a long-distance point-type sensing system. Background technique [0002] Optical fiber point sensors have many advantages: anti-electromagnetic interference, small size, passive, corrosion resistance and so on. These characteristics make the optical fiber point sensor have a great range of applications, it can be used in oil wells, natural gas pipelines, tunnels, bridges and other occasions. When remote telemetry is required due to objective conditions, such as environmental hazards such as volcanic eruptions and nuclear radiation, or deserts and other inaccessible areas, various technical means need to be used to extract sensor signals remotely. In order to extend the sensing distance, the existing technologies include high-speed frequency sweep lasers and Raman amplification, active fiber remote pump amplification and other methods. The above implementation methods g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/26
Inventor 王子南饶云江姜芸
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA