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A method and system for cotdr measurement based on sub-chirped pulse extraction

A technology of chirped pulse and measurement method, which is applied in measurement devices, instruments, and optical devices to transmit sensing components, etc., can solve the problems of small measurement range and slow measurement speed of reflectometers, so as to improve measurement efficiency and avoid time-consuming Frequency sweeping process, the effect of expanding the sweeping range

Active Publication Date: 2021-05-07
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a COTDR measurement method based on sub-chirped pulse extraction and its system in order to solve the technical problems of slow measurement speed and small measurement range of the existing coherent optical time domain reflectometer

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  • A method and system for cotdr measurement based on sub-chirped pulse extraction
  • A method and system for cotdr measurement based on sub-chirped pulse extraction
  • A method and system for cotdr measurement based on sub-chirped pulse extraction

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Embodiment 1

[0067] see figure 1 As shown, the embodiment of the present invention provides a COTDR measurement method based on sub-chirped pulse extraction. The method steps include:

[0068] S101. Inject the chirped pulse signal into the optical fiber to be detected, and obtain the coherent Rayleigh scattering signal of the chirped pulse signal;

[0069] S102. Based on the coherent Rayleigh scattering signal, a sub-chirped pulse extraction algorithm is used to obtain the coherent Rayleigh scattering response of a series of sub-chirped pulse signals;

[0070] S103, based on the coherent Rayleigh scattering response of the chirped pulse signal, obtain the coherent Rayleigh scattering response pattern when the fiber is not disturbed and the coherent Rayleigh scattering response pattern when the fiber is disturbed; based on the coherence when the fiber is not disturbed and disturbed The Rayleigh scattering response pattern captures fiber perturbation information.

[0071] It can be unders...

Embodiment 2

[0100] It can be understood that the spectral range of the coherent Rayleigh scattering of the chirped pulse is consistent with the frequency range of the chirped pulse, and since the coherent Rayleigh scattering signal needs to be converted into the digital domain, the detection in the coherent detection module in the measurement system The bandwidth of the device needs to be greater than or equal to the bandwidth of the chirped pulse, and its sampling rate often needs to be more than twice the bandwidth of the chirped pulse. Due to the limitations of electrical detection and sampling equipment, the frequency sweep range of chirped pulses will also be limited to a certain extent. In order to solve this problem, further expand the frequency domain interval of the chirped pulse, refer to Figure 4 As shown, it shows another COTDR measurement system based on sub-chirped pulse extraction provided by Embodiment 2 of the present invention. The difference between its scheme and the ...

Embodiment 3

[0111] refer to Figure 6 As shown, the specific hardware structure of a COTDR measurement system based on sub-chirped pulse extraction provided by Embodiment 3 of the present invention, the measurement system 3 may include: a memory 32 and a processor 33; each component is coupled together through a communication bus 31 . It can be understood that the communication bus 31 is used to realize connection and communication between these components. In addition to the data bus, the communication bus 31 also includes a power bus, a control bus and a status signal bus. But for clarity, in Figure 6 The various buses are denoted as communication bus 31 in FIG.

[0112] Memory 32, used for storing the measurement method program that can run on the processor 33;

[0113] The processor 33 is configured to perform the following steps when running the measurement method program:

[0114] Step 1. Inject the chirped pulse signal p(t) into the optical fiber to be detected, and obtain th...

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Abstract

The invention discloses a COTDR measurement method based on sub-chirped pulse extraction, which relates to the technical field of optical fiber sensing and measurement. The method steps include: injecting a chirped pulse signal into an optical fiber to be detected, and obtaining coherent Rayleigh scattering of the chirped pulse signal signal; based on the coherent Rayleigh scattering signal, the sub-chirped pulse extraction algorithm is used to obtain the coherent Rayleigh scattering response of the sub-chirped pulse signal; based on the coherent Rayleigh scattering response of the sub-chirped pulse signal, the The coherent Rayleigh scattering response pattern when the fiber is disturbed; based on the coherent Rayleigh scattering response pattern when the fiber is not disturbed and when it is disturbed, the fiber disturbance information is obtained through a suitable delay estimation algorithm. The invention also discloses a COTDR measurement system based on sub-chirped pulse extraction. The invention obtains the Rayleigh scattering signal through the sub-chirped pulse extraction process instead of the frequency sweep process, and can improve the measurement speed and the measurement dynamic range of the optical fiber sensing system.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing and measurement, in particular to a COTDR measurement method based on sub-chirped pulse extraction and a system thereof. Background technique [0002] Optical time domain reflectometer based on Rayleigh scattering is a very important branch in the field of distributed sensing, which has the advantages of high measurement accuracy, large number of measurement points, and long measurement distance. [0003] According to the sensing signal demodulation method, Rayleigh scattering-based optical time domain reflectometry can be divided into two categories: phase demodulation type and frequency demodulation type. The main application of phase demodulation type is phase sensitive optical time domain reflectometer (Φ-OTDR); the main application of frequency demodulation type is coherent optical time domain reflectometer (COTDR). Among them, for the existing coherent optical time domain refl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/353
CPCG01D5/35361
Inventor 王子南熊吉吴悦饶云江
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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