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Phase calculation method for phase sensitive optical time domain reflectance optical fiber distributed sensing system

A fiber-optic distributed, phase-sensitive light technology, applied in the direction of utilizing wave/particle radiation, instruments, measuring devices, etc.

Active Publication Date: 2019-06-04
武汉雷施尔光电信息工程有限公司
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Problems solved by technology

[0004] The purpose of the present invention is to provide a phase-sensitive optical time-domain reflection optical fiber distributed vibration sensing system phase calculation method to solve the problem of accurately obtaining the phase change value introduced by the actual external vibration

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  • Phase calculation method for phase sensitive optical time domain reflectance optical fiber distributed sensing system
  • Phase calculation method for phase sensitive optical time domain reflectance optical fiber distributed sensing system
  • Phase calculation method for phase sensitive optical time domain reflectance optical fiber distributed sensing system

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Embodiment 1

[0026] see figure 1 , a phase-sensitive optical time-domain reflection optical fiber distributed vibration sensing system, including a narrow linewidth laser 1, a 1´2 fiber coupler 2, an acousto-optic modulator 3, an erbium-doped fiber amplifier 4, a fiber circulator 5, and a sensing fiber 6. 2´2 fiber optic coupler 7, balanced light detector 8, data acquisition card 9, computer 10.

[0027] The components of each part of the system are described as follows:

[0028] Narrow linewidth laser 1, used to generate long coherence length laser;

[0029] 1´2 fiber optic coupler 2, used to divide the laser into two paths, one for the sensing light path, and the other for the reference light path, the optical power of the sensing light path is much greater than that of the reference light path, and the coupling splitting ratio can be selected as 90:10;

[0030] The acousto-optic modulator 3 is used to modulate the laser into a pulsed laser, and at the same time, allow the laser pulse ...

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Abstract

The invention discloses a phase-sensitive optical time domain reflectometry fiber distributed sensing system phase calculation method comprising the following steps that beat frequency digital signals corresponding to multiple times of optical pulses are acquired; a backscattering optical phase matrix phi is obtained; an external vibration disturbance position Y is determined; positions X and Z without phase disturbance are respectively selected before and after the external vibration disturbance position Y, phase unwrapping of the corresponding phases phiX and phiZ of the positions X and Z without phase disturbance in the backscattering optical phase matrix phi is performed, and phase change is extended to the range from negative infinite to positive infinite; and the phase curve of the position Z after vibration subtracts the phase curve of the position X before vibration and then is divided by 2 so that a phase change value introduced to Y by external vibration is obtained. According to the calculation method, the phase change value introduced to the optical pulses by the external vibration event in a phi-OTDR fiber distributed sensing system can be accurately obtained, and the method is based on a conventional phi-OTDR fiber distributed sensing system with no requirement for complex algorithm.

Description

technical field [0001] The invention relates to a phase calculation method of an optical fiber distributed vibration sensing system, in particular to a phase-sensitive optical time domain reflection optical fiber distributed vibration sensing system phase calculation method, and the invention belongs to the field of optical fiber sensing technology application. Background technique [0002] Phase-sensitive Optical Time Domain Reflectometry (Phase-sensitive Optical Time Domain Reflectometry, abbreviated as Ф-OTDR or Phase-sensitive OTDR) optical fiber distributed sensing system is used to monitor external vibration disturbance events, and can realize the location of external vibration disturbance events It has the advantages of linear distributed measurement, remote measurement, high sensitivity, strong anti-electromagnetic interference, good insulation, intrinsically safe, light weight and small size, and is widely used. In the field of petrochemical industry, Ф-OTDR can rea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 庞拂飞贺梦婷梅煊玮陈娜王廷云
Owner 武汉雷施尔光电信息工程有限公司
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