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Distributed optical fiber sensing system

A technology of distributed optical fiber and sensing system, which is applied in the direction of using optical devices to transmit sensing components, converting sensor outputs, and using optical devices, etc., can solve the problems of affecting response time and high cost, and achieve dynamic measurement and eliminate line losses. , Eliminate the effect of unstable laser light source

Inactive Publication Date: 2016-11-23
YANSHAN UNIV
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Problems solved by technology

In traditional systems, optical methods are usually used or software methods are used to decouple temperature and strain, which is costly and affects response time

Method used

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  • Distributed optical fiber sensing system

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Embodiment Construction

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0016] see figure 1 , in an embodiment of the present invention, a distributed optical fiber sensing system includes a narrow linewidth laser 1, a modulator 2, an optical isolator 3, an erbium-doped fiber amplifier 4, a circulator 5, a fiber grating 6, and a sensing fiber 7 , optical detector 8, microwave amplifier 9, high-pass filter 10, power divider 11, first filter module 12, first microwave detection module 13, first low frequency amplifier 14, second fil...

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Abstract

The invention discloses a distributed optical fiber sensing system, which comprises a narrow linewidth laser, a modulator, an optical isolator, an erbium-doped optical fiber amplifier, a circulator, an optical fiber grating, a sensing optical fiber, an optical detector, a microwave amplifier, a high pass filter, a power distributor, a first filter module, a first microwave detection module, a first low-frequency amplifier, a second filter module, a second microwave detection module, a second low-frequency amplifier, a data acquisition card and a computer. Distributed optical fiber vibration or sound signal measurement is realized, dynamic large-phase signal measurement is effectively realized, a phase cancellation and fading problem can be eliminated, a high-speed data acquisition device with a GS / s sampling rate is not needed, the cost is reduced, the response time is not influenced, the strength and the frequency shift changes of Brillouin scattering light can be measured respectively on the premise of eliminating instability of a laser source and line loss, and temperature changes and the strain are further obtained.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a distributed optical fiber sensing system. Background technique [0002] Distributed optical fiber sensing technology is an important branch of optical fiber sensing. It can continuously monitor the temperature, strain, vibration and Physical quantities such as sound have good application prospects and occupy a major position in the optical fiber sensing market. [0003] According to the sensing principle, distributed optical fiber sensing technology can be mainly divided into two types based on interference principle and backscattering detection technology. The former uses the M-Z type, Sagnac type and composite structure to obtain relevant location information and external physical information through positioning algorithms and demodulation algorithms. The latter uses changes in polarization, light intensity, frequency shift, and phase of backscattered light to...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353G01B11/16G01K11/32G01K11/322
CPCG01B11/18G01D5/35364G01K11/32G01K11/322
Inventor 陈月娥李国强邵秋峰王书涛王勇朱艳英贾丽笑
Owner YANSHAN UNIV
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