Optical frequency division multiplexing phase-sensitive optical time domain reflectometer

A phase-sensitive optical and time-domain reflectometer technology, which is applied in the direction of using wave/particle radiation, using optical devices to transmit sensing components, instruments, etc. The application range of sensor technology, the inability to reflect the advanced nature and superiority, etc., to achieve the effect of improving the dynamic range, increasing the sampling rate, and increasing the sensitivity

Inactive Publication Date: 2012-08-22
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

However, it is only limited to qualitative measurement of the amplitude and frequency information of the disturbance signal, and has not quantitatively obtained the phase information of the optical fiber link and the disturbance position.
On the other hand, due to the restriction of the sampling rate, the highest detectable disturbance frequency is less than 1

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  • Optical frequency division multiplexing phase-sensitive optical time domain reflectometer
  • Optical frequency division multiplexing phase-sensitive optical time domain reflectometer
  • Optical frequency division multiplexing phase-sensitive optical time domain reflectometer

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the embodiments and accompanying drawings.

[0019] see first figure 1 , figure 1 is a structural schematic diagram of an embodiment of an optical frequency division multiplexing phase-sensitive optical time-domain reflectometer of the present invention. 2, phase modulator 3, polarization scrambler 4, erbium-doped fiber amplifier 5, acousto-optic modulator 6, fiber optic circulator 7, signal generator module 8, trigger source 9, double-balanced detector 10, low-pass filter 11. Data acquisition card 12, computer 13 and long-distance sensing optical fiber 14.

[0020] The light emitted by the narrow linewidth laser 1 is firstly divided into two paths through the fiber coupler 2, one path is signal light, and the other path is local light. The signal light enters the phase modulator 3 along the optical fiber 201, and the electrical signal output by the signal generator module 8 is used to modulate...

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Abstract

The invention discloses an optical frequency division multiplexing phase-sensitive optical time domain reflectometer which comprises a narrow line width laser, an optical fiber coupler, a phase modulator, a scrambler, an erbium-doped optical fiber amplifier, an acoustic optical modulator, an optical fiber circulator, a signal generator module, a trigger source, a double balance detector, a low pass filter, a data acquisition card, a computer and a long-distance sensing optical fiber. According to the optical frequency division multiplexing phase-sensitive optical time domain reflectometer, the fundamental contradictions between the measuring distance and sampling rate in a distributed sensing system can be solved, and remoter or higher-frequency vibration is detected; and moreover, due to amplitude and phase information, the characteristics of a vibration source are judged at the first time, and the early warning can be provided immediately.

Description

technical field [0001] The invention relates to an optical time domain reflectometer, in particular to an optical frequency division multiplexing phase-sensitive optical time domain reflectometer. Background technique [0002] Phase sensitive optical time domain reflectometry (Phase-OTDR) is a new type of distributed optical fiber sensor based on Rayleigh scattering, which can remotely monitor the external dynamic physical quantities along the optical fiber line. real-time monitoring. Different from conventional optical time domain reflectometry (OTDR for short), Phase-OTDR uses a laser with a narrow linewidth (about KHz) and a very small frequency drift as a light source, by detecting Various characteristic physical quantities (amplitude, frequency, phase, etc.) at the disturbance position are obtained by the interference signal of the Rayleigh backscattered light, and the event is located by the echo time. Therefore, in addition to many characteristics of conventional di...

Claims

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Application Information

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IPC IPC(8): G01H9/00G01D5/36
Inventor 周俊潘政清梁可桢叶青蔡海文瞿荣辉
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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