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High-repeatability quasi-distributed sensing system based on CP-phi(OTDR) and implementation method of system

A quasi-distributed, sensing system technology, applied in the direction of converting sensor output, using optical devices to transmit sensing components, measuring devices, etc., can solve the mutual constraints between measurement repetition rate and sensing distance, increase repetition rate, and cannot guarantee high issues such as spatial resolution

Active Publication Date: 2019-11-15
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
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Problems solved by technology

[0008] The purpose of the present invention is: the present invention provides a high repetition rate quasi-distributed sensing system based on CP-ΦOTDR and its implementation method, which solves the mutual constraints of measurement repetition rate and sensing distance in the current quasi-distributed measurement system , the technical problem of not being able to guarantee a high repetition rate while the system has a high spatial resolution

Method used

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  • High-repeatability quasi-distributed sensing system based on CP-phi(OTDR) and implementation method of system
  • High-repeatability quasi-distributed sensing system based on CP-phi(OTDR) and implementation method of system
  • High-repeatability quasi-distributed sensing system based on CP-phi(OTDR) and implementation method of system

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Embodiment 1

[0081] The high repetition rate quasi-distributed sensing system in the embodiment of the present invention is mainly realized based on an optical time-domain reflectometer (OTDR), specifically, based on a chirped pulse phase-sensitive optical time-domain reflectometer (CP- ΦOTDR) realized.

[0082] Such as figure 1 As shown, a high repetition rate quasi-distributed sensing system based on CP-ΦOTDR provided in this embodiment includes a laser module 1, the laser module 1 generates an optical signal to a coupler 2, and the coupler 2 is an optical coupler, 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 N positive and negative chirped pulsed optical signals located in the same frequency band or different frequency bands, The output end of the optical signal modulation module 3 is connected to the port 1 of the optical c...

Embodiment 2

[0140] Such as Figure 5 As shown, Embodiment 2 of the present invention provides a high repetition rate quasi-distributed sensing system based on CP-ΦOTDR. In Embodiment 2 of the present invention, the signal modulation module includes a waveform generator 31 and an electro-optical modulator 32, wherein the split output 1 of the optocoupler 2 is connected to the electro-optic modulator 32, and the split output 2 is connected to the signal detection module 6 Connection, the waveform 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 2 ports of the optical circulator 4 are connected with the sensing fiber 5 to be tested, the optical circulator 4 Port 3 of the signal detection module 6' is connected.

[0141] In Embodiment 2 of the present invention, the waveform generator 31 is used to process the pre-written positive and negative chirp waveforms, the digi...

Embodiment 3

[0144] Such as Image 6 Shown is a high repetition rate quasi-distributed sensing system based on CP-ΦOTDR provided by Embodiment 3 of the present invention.

[0145] The difference between this embodiment and Embodiment 2 is that the signal detection module 6 includes an optical mixer 61 and a signal collector 62, wherein the optical mixer 61 uses an optical coupler, and the specific detection signals are local oscillator light and signal light At the same time, it enters the optical mixer 61, and then the signal collector 62 collects the output beat frequency signal, then performs Hilbert transformation through the signal demodulation module 7 to obtain the phase information of the optical signal, and then demodulates to obtain the disturbance information; The branch 2 of the optical mixer 61 is additionally provided with a polarization control module 8 to control the polarization state of the local oscillator light and further improve the signal-to-noise ratio of the measur...

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Abstract

The invention discloses a high-repeatability quasi-distributed sensing system based on a CP-phi(OTDR) and an implementation method of the system and belongs to the field of optical fiber sensing measurement technologies. The system comprises a laser module, a coupler, an optical signal modulation module, a signal detection module, an optical circulator and a to-be-detected sensing optical fiber, wherein the optical signal modulation module modulates an optical signal into N positive and negative chirped pulse optical signals located in the same frequency band or different frequency bands, thesignal detection module generates a beat frequency signal by use of a reflected optical signal and a local oscillation optical signal input by the coupler, the signal detection module inputs the beatfrequency signal into a signal demodulation module for demodulation and output, and disturbance information of the reflected optical signal is obtained. Through the system, measurement repeatability is improved by N times while a high spatial resolution is guaranteed, double-channel detection is not needed, only a single channel is needed, and therefore the complexity of the system is lowered.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing and measurement, in particular to a high repetition rate quasi-distributed sensing system based on CP-ΦOTDR and an implementation method thereof. Background technique [0002] As a detection device integrating automatic measurement, recording and other functions, the sensor has been widely used in our life and production activities. Compared with traditional electrical sensors, optical fiber-based sensors have unique advantages such as portability, corrosion resistance, anti-electromagnetic interference, high temperature resistance, and high detection sensitivity. Therefore, distributed optical fiber sensing has developed rapidly in recent decades. [0003] Phase-sensitive optical time-domain reflectometer is a typical distributed optical fiber sensing system, which monitors the external interference in real time by demodulating the interference intensity of Rayleigh scattered light ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353
CPCG01D5/35316
Inventor 王子南王紫檀熊吉蒋家林饶云江
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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