High-speed distributed optical fiber sensing system and method based on fractional Fourier transform

A technology of fractional Fourier transform and distributed optical fiber, which is applied in the direction of converting sensor output, using optical devices to transmit sensing components, measuring devices, etc., which can solve the problems that the measurement speed of high spectrum utilization cannot be guaranteed.

Active Publication Date: 2020-10-30
STATE GRID SICHUAN ECONOMIC RES INST
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Problems solved by technology

[0008] The technical problem to be solved by the present invention is: in the current distributed sensing system, due to the mutual restriction of the measurement speed and the sensing distance, it is impossible to guarantee the technical problem of improving the measurement speed while the system has high frequency spectrum utilization and single-channel detection

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  • High-speed distributed optical fiber sensing system and method based on fractional Fourier transform
  • High-speed distributed optical fiber sensing system and method based on fractional Fourier transform
  • High-speed distributed optical fiber sensing system and method based on fractional Fourier transform

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Embodiment 1

[0081] The high-speed distributed optical fiber sensing system and method in this embodiment are mainly realized based on Fractional Fourier Transform (FrFT), specifically, chirped pulse phase-sensitive optical time based on Fractional Fourier Transform. Realized by domain reflectometer.

[0082] Such as figure 1 As shown, the high-speed distributed optical fiber sensing system based on fractional Fourier transform provided in this embodiment includes a laser module 1, and the laser module 1 generates an optical signal to a coupler 2, and the coupler 2 is an optical coupler 2 , the coupler 2 respectively inputs the optical signal into the optical signal modulation module 3 and the signal detection module 6, and the optical signal modulation module 3 modulates the optical signal into x chirped pulsed optical signals with different chirp rates, the The output end of the optical signal modulation module 3 is connected to the port 1 of the optical circulator 4, and the port 2 of ...

Embodiment 2

[0110] This embodiment provides a high-speed distributed optical fiber sensing system and method based on fractional Fourier transform. Wherein, the signal modulation module includes a waveform generator 31 and an electro-optical modulator 32, the split output 1 of the optocoupler 2 is connected to the electro-optic modulator 32, the split output 2 of the optocoupler 2 is connected to the signal detection module 6, and the waveform The generator 31 is connected with the electro-optic modulator 32, the output end of the electro-optic modulator 32 is connected with the 1 port of the optical circulator 4, the port 2 of the optical circulator 4 is connected with the sensing fiber 5 to be tested, and the port 3 of the optical circulator 4 Connect with the signal detection module 6.

[0111] In this embodiment, the pre-written chirped waveform is processed using the waveform generator 31, the digital signal of the chirped pulse is converted into an electrical signal, and then the ch...

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Abstract

The invention discloses a high-speed distributed optical fiber sensing system and method based on fractional Fourier transform. A laser module generates an optical signal, a coupler inputs the opticalsignal into an optical signal modulation module and a signal detection module, and the optical signal modulation module modulates the optical signal into x chirped pulse optical signals with different chirp rates and sends the x chirped pulse optical signals to a to-be-detected sensing optical fiber; after passing through the sensing optical fiber to be detected, mixed scattered light signals generated by x chirped pulse light signals with different chirp rates are sent to the signal detection module; the signal detection module obtains a beat frequency signal by using the optical signal sentby the coupler and the mixed scattered light signal, and the signal demodulation module demodulates the beat frequency signal and then outputs a result. According to the invention, different chirp rates can be set under the same sensing bandwidth, the occupied system sensing bandwidth is reduced, the spectrum utilization rate is increased, the measurement speed is increased by x-1 times, measurement can be completed only through a single channel, and the system complexity is reduced.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing and measurement, in particular to a high-speed distributed optical fiber sensing system and method based on fractional Fourier transform. Background technique [0002] Distributed Fiber Optic Sensing (DFOS) is widely used in modern society, especially in the fields of oil transmission, power monitoring, large structure security and border security. The basic principle of distributed optical fiber sensing is that changes in external environmental factors, such as temperature, vibration, etc., lead to changes in the characteristics of the optical fiber itself, such as the refractive index, which in turn affects the transmission light field in the fiber and changes the scattered light field in the fiber. Therefore, by detecting the characteristics of scattered light (Rayleigh scattered light, Brillouin scattered light or Raman scattered light), the affected position of the optical fiber...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/36G01D5/353
CPCG01D5/36G01D5/35361
Inventor 张全明姚实颖罗劲瑭陈一鸣杨宇玄祝和春王子南张晨琳吴函阳小龙
Owner STATE GRID SICHUAN ECONOMIC RES INST
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