Optical fiber disturbance detection method and device

A detection method, optical fiber technology, applied in the direction of using optical devices to transmit sensing components, etc., can solve the problems of inappropriate measurement of high-frequency disturbances, long time consumption, and failure to measure at the same time

Active Publication Date: 2014-07-30
东莞先进光纤应用技术研究院有限公司 +2
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Problems solved by technology

However, due to the need for frequency sweeping and other reasons, it takes a long time, this solution is not suitable for measuring high-frequency disturbances
[0005] In real life, there may be high-frequency dynamic disturbances or quasi-static disturbances for optical fiber disturbances. Quasi-static disturbances a

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  • Optical fiber disturbance detection method and device

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Embodiment Construction

[0032] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0033] Optical fiber disturbance detection method, comprising the following steps:

[0034] Step 1, injecting probe light into the sensing fiber under test;

[0035] Step 2: The probe light generates back Rayleigh scattered light in the measured sensing fiber, and the back Rayleigh scattered light is mixed with the local oscillator light and then detected by a balanced detector; the details are as follows:

[0036] (201) Adjust the frequency of the detection light M times, so that the frequency of the detection light is f 1 , f 2 ,..., f M, detect N times of Rayleigh backscattering light signals at each frequency, obtain M×N Rayleigh backscattering curves, and extract all points on the M×N Rayleigh backscattering curves as a set of measurement data;

[0037] (202) Repeat the step of (201) K times to obtain K sets of measurement data, and finall...

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Abstract

The invention discloses an optical fiber disturbance detection method. According to the method, in the measuring process, segmentation frequency scanning is performed, a scattering curve of he same frequency light is used for measuring dynamic disturbance, correlation detection is performed on the distribution curve, obtained through K-set measurement, of the light power of backward Rayleigh scattering light of any point on a sensor fiber along with the frequency and the distribution curve, obtained through first-set measurement, of the light power of backward Rayleigh scattering light of the corresponding point along with the frequency so as to measure quasi-static disturbance, and therefore simultaneous measurement of dynamic disturbance signals and quasi-static disturbance signals is achieved, and the measuring function and application range of a full-distributed type optical fiber sensor are greatly expanded. The invention further discloses an optical fiber disturbance detection device. The device in a measuring system is simple in structure and low in cost, the measuring time is much shorter than the dynamic and quasi-static disturbance measuring time performed by utilizing two sets of systems, and the continuous measurement of dynamic and quasi-static disturbance can be achieved.

Description

technical field [0001] The invention relates to the field of optical fiber sensing, in particular to an optical fiber disturbance detection method and device. Background technique [0002] With the development of optical fiber communication, especially the rapid development of backbone transmission network, passive optical network and optical fiber access technology, the role of optical fiber cable in the field of communication is becoming more and more important. In today's information age, the unexpected interruption of communication caused by damage to optical fiber cables will cause immeasurable losses. In order to reduce the loss as much as possible, it is urgent to establish a safety protection system for the optical cable line, which can detect the abnormal situation and its location in the optical cable as soon as possible, so as to report to the police, prevent and repair in time, and minimize the loss. [0003] The phase-sensitive optical time-domain reflectometry...

Claims

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Application Information

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IPC IPC(8): G01D5/28
Inventor 王峰张旭苹周玲
Owner 东莞先进光纤应用技术研究院有限公司
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