Pumpless multi-wavelength Brillouin fiber laser sensor for low-frequency detection

A fiber laser, multi-wavelength technology, applied in the direction of converting sensor output, using optical devices to transmit sensing components, instruments, etc., can solve the problems of poor anti-interference ability, low detection sensitivity, low measurement accuracy, etc., to improve measurement accuracy, Improve detection sensitivity and uniform power distribution

Active Publication Date: 2018-04-13
TAIYUAN UNIV OF TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of low detection sensitivity, poor anti-interference ability and low measurement accuracy of existing optical fiber laser sensors, the present invention provides a non-pumped multi-wavelength Brillouin optical fiber laser sensor for low-frequency detection

Method used

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  • Pumpless multi-wavelength Brillouin fiber laser sensor for low-frequency detection
  • Pumpless multi-wavelength Brillouin fiber laser sensor for low-frequency detection
  • Pumpless multi-wavelength Brillouin fiber laser sensor for low-frequency detection

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Embodiment Construction

[0016] Low-frequency detection non-pumped multi-wavelength Brillouin fiber laser sensor, including narrow-linewidth single-frequency laser 8, second unidirectional optical splitter 9, low-frequency photodetector 10, spectrometer 11, resonant cavity;

[0017] The resonant cavity includes a semiconductor optical amplifier 1, an optical circulator 2, a polarization controller 5, an optical isolator 6, a first unidirectional optical splitter 7, and a Sagnac ring cavity mirror;

[0018] The Sagnac ring cavity mirror includes a bidirectional optical splitter 3 and a highly nonlinear sensing fiber 4;

[0019] Among them, the output end of the semiconductor optical amplifier 1 is connected to the incident end of the optical circulator 2; the reflective end of the optical circulator 2 is connected to the uplink port of the bidirectional optical splitter 3; one of the two downlink ports of the bidirectional optical splitter 3 The output end of the optical circulator 2 is connected to the incid...

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Abstract

The invention relates to a fiber laser sensor, and specifically relates to a pump-free multi-wavelength Brillouin fiber laser sensor for low-frequency detection. The sensor solves the problems of low detection sensitivity, poor anti-interference capability and low measurement precision of the existing fiber laser sensor. The pump-free multi-wavelength Brillouin fiber laser sensor for low-frequency detection comprises a narrow line width single-frequency laser, a second one-way light divider, a low-frequency photoelectric detector, a spectrum analyzer and a resonant cavity; the resonant cavity comprises a semiconductor optical amplifier, an optical circulator, a polarization controller, an optical isolator, a first one-way light divider and a Sagnac circular endoscope; and the Sagnac circular endoscope comprises a double-way light divider and a high nonlinear sensing fiber. The invention is applicable in the field of fiber sensors.

Description

Technical field [0001] The invention relates to a fiber laser sensor, in particular to a low-frequency detection non-pumped multi-wavelength Brillouin fiber laser sensor. Background technique [0002] The existing fiber laser sensors are mainly divided into three types: single-wavelength fiber laser sensors, multi-wavelength fiber laser sensors, and multi-longitudinal mode fiber laser sensors. Practice has shown that the above three types of fiber laser sensors have the following problems due to their own principles: to achieve high-sensitivity detection, a spectrometer is needed for detection, which leads to increased system complexity and cost. In order to overcome the above problems, Chinese patent ZL201410691738.7 discloses a fiber temperature sensor based on a multi-wavelength Brillouin fiber laser. However, due to the limitation of the optical path structure, this type of sensor can only obtain wavelengths of one order of magnitude, and the power distribution is severely u...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/353
CPCG01D5/35364
Inventor 刘毅张明江张建忠王云才李云亭
Owner TAIYUAN UNIV OF TECH
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