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Distributed optical fiber vibration sensing system capable of increasing detection range

A technology of vibration sensing system and distributed optical fiber, which is applied in the direction of measuring device, measuring ultrasonic/sonic wave/infrasonic wave, instrument, etc., can solve the problem that the effective detection distance is difficult to meet the application, so as to increase the effective detection distance, reduce the modification cost, The effect of suppressing nonlinear effects

Inactive Publication Date: 2017-06-20
SHANGHAI BOOM FIBER SENSING TECH
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Problems solved by technology

[0004] For some large-scale and long-distance engineering projects, this effective detection distance is difficult to meet the application requirements.

Method used

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  • Distributed optical fiber vibration sensing system capable of increasing detection range
  • Distributed optical fiber vibration sensing system capable of increasing detection range
  • Distributed optical fiber vibration sensing system capable of increasing detection range

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Embodiment Construction

[0016] The main components of the Raman amplifier are: high-power semiconductor pump light source (LD), multiplexer (WDM), isolator (ISO), etc. figure 1 A schematic diagram of the structure of the Raman amplifier. The Raman amplifier includes a first multiplexer, the input of the first multiplexer is connected to the output of several high-power semiconductor pump light sources, and the output of the first multiplexer is connected to the second multiplexer The input end of the second multiplexer is connected to the input end of the optical fiber signal, the output end of the second multiplexer is the signal output end, and the optical fiber signal input end is also provided with an isolator.

[0017] In an optical medium, the pump light with a shorter wavelength transfers a small part of the incident power to another beam with a longer wavelength. The difference between the two wavelengths is determined by the vibration mode of the medium. This process is called stimulated Ram...

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Abstract

The invention discloses a distributed optical fiber vibration sensing system capable of increasing a detection range. The distributed optical fiber vibration sensing system comprises a pulsed light source; the pulsed light source is connected with a divider; and two output ends of the divider are connected with a detection channel respectively. The distributed optical fiber vibration sensing system is characterized in that a Raman amplifier is added to an optical path of each channel, the Raman amplifier is connected with one input end of a combiner, the other input end of the combiner is externally connected with a test optical cable with a length of 40 to 60 kilometers; and the output end of the combiner is connected with a signal processing circuit of the detection channel through a loop device. The distributed optical fiber vibration sensing system capable of increasing a detection range has the advantages that the Raman amplifier is integrated to the original DVS system, the effective detection range of the system is improved significantly, the device cost can be reduced, and the construction cost and the maintenance cost can be reduced.

Description

technical field [0001] The invention relates to a distributed optical fiber vibration sensing system, in particular to a distributed optical fiber vibration sensing system with increased detection distance. Background technique [0002] The distributed optical fiber vibration sensing system (DVS) is based on the optical time domain reflectometry (Ф-OTDR) technology with phase information, and uses G652 single-mode optical fiber as the sensing medium. The laser emits narrow-linewidth pulsed laser light and transmits it along the sensing fiber, and at the same time continuously generates Rayleigh scattered light that travels backward, and the Rayleigh scattered light undergoes multi-beam interference. When the sensing fiber is disturbed by external vibration, the phase of the back Rayleigh scattered light will change, which will cause the intensity distribution of multi-beam interference to change. The photoelectric conversion device detects the changes in the intensity distr...

Claims

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Application Information

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IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 蒋超赵国庆冯小蔚杨建刚
Owner SHANGHAI BOOM FIBER SENSING TECH
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