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Method for enhancing performance of distributed sensing system by subcarrier wave technique

A sensing system, distributed technology, applied in the direction of electromagnetic wave transmission system, transmission system, testing optical performance, etc., can solve the problems of small signal duty cycle, limited sensing performance, narrow optical pulse width, etc., to improve the extinction ratio and signal-to-noise ratio, improved sensing performance, and important practical value

Inactive Publication Date: 2009-09-09
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
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Problems solved by technology

[0003] However, as the requirements for spatial resolution and measurement distance of these systems are further improved, the optical pulse width will become narrower and narrower, and the duty cycle of the signal will become smaller and smaller, resulting in a sharp drop in signal-to-noise ratio. , that is to say, in the cycle of sending a pulse, the total energy of the light in the time gap without pulse is relatively large compared to the energy of the pulse itself, which will seriously affect the signal-to-noise ratio of the system, thereby severely limiting the sensing performance

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  • Method for enhancing performance of distributed sensing system by subcarrier wave technique
  • Method for enhancing performance of distributed sensing system by subcarrier wave technique
  • Method for enhancing performance of distributed sensing system by subcarrier wave technique

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[0011] specific implementation plan

[0012] Such as figure 1 Shown, the φ-OTDR sensing system of application method of the present invention comprises narrow line width laser 1, 9: 1 coupler 2, electro-optic modulator 3, signal generating circuit 4,12, erbium-doped fiber amplifier 5, circulator 6, A sensing fiber 7, a 1:1 coupler 8, a detector 9, a band-pass filter with a center frequency of 1GHZ, a mixer 11 and a low-pass filter with a cutoff frequency of 50MHZ. The continuous laser light emitted by the laser 1 is divided into two parts by a 9:1 coupler. The signal generation circuit 4 generates an optical pulse with a carrier frequency of 1GHZ. 90% of the continuous laser light is output by the electro-optic modulator 3. The carrier frequency optical pulse, the carrier frequency optical pulse The pulse power enters the port 1 of the circulator 6 after being amplified by the erbium-doped fiber amplifier 5 , and enters the sensing fiber 7 after coming out from the port 2 . ...

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Abstract

This invention relates to a method of applying subcarrier wave technology to advance distributivity sensing system's behavior. The invention modulate impulse signal to one carrier frequency, at receiving end, signal mostly lay carrier frequency band, but noise produced by not ideal extinction ratio mostly lay baseband. Then adopt bandpass filtering technology to fliter off noise; at last down converse signal to baseband for disposing.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensors, and specifically relates to a method for improving the performance of a distributed sensing system by using subcarrier technology. The distributed sensing system refers to a distributed sensing system based on an optical time domain reflectometer, specifically It is a distributed sensing system of polarization state optical time domain method (POTDR) / Brillouin optical time domain reflectometry (BOTDR) / coherent phase optical time domain reflectometry (φ-OTDR). Background technique [0002] Optical Time Domain Reflectometer (OTDR) is currently the most important technology for optical fiber and optical cable production and line maintenance. It has the ability to remotely detect and locate optical fiber transmission loss, connection loss, breakpoints and fractures. POTDR / BOTDR / φ—OTDR is a distributed optical fiber sensing system based on OTDR technology. POTDR is extremely sensitive t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M11/02H04B10/12H04B10/08H04B10/071
Inventor 饶云江冉曾令谢孔利
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA