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Mach-Zehnder Interferometer and Phi-OTDR based voice acquisition distributed fiber sensing system

A-OTDR, distributed optical fiber technology, applied in the field of distributed optical fiber sensing, can solve the problems of low fiber utilization rate and high cost, and achieve the effect of improving fiber resource utilization rate

Inactive Publication Date: 2020-01-07
SHANDONG UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] However, in practical applications, in addition to detecting vibration signals, distributed optical fiber sensing systems often need to monitor or transmit sound to a certain location, which requires multiple sets of optical fiber sensing systems, which are costly and low in fiber utilization.

Method used

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  • Mach-Zehnder Interferometer and Phi-OTDR based voice acquisition distributed fiber sensing system

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Embodiment 1

[0030] Such as figure 1 As shown, a distributed optical fiber sensing system with sound collection function based on Mach-Zehnder interferometer and φ-OTDR includes laser 1, isolator 2, first coupler 3, optical modulator 4, first Optical fiber amplifier 5, pulse driver 15, optical fiber circulator 6, second optical fiber amplifier 7, first photodetector 8, second coupler 9, third coupler 12, optical fiber pickup box 11, second photodetector 13 , a data acquisition and processing module 14 and a four-core detection optical fiber 10.

[0031] The laser 1 emits narrow-band laser, and enters the first coupler 3 through the isolator 2. The first coupler 3 divides the optical signal into two signals, one is 90% narrow-band laser, and the other is 10% narrow-band laser.

[0032] Further, 90% of the optical signals are modulated into pulsed optical signals by the optical modulator 4 . The pulsed optical signal is amplified by the first optical fiber amplifier 5 and enters the A end ...

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Abstract

The invention relates to a Mach-Zehnder Interferometer and Phi-OTDR based voice acquisition distributed fiber sensing system. The Mach-Zehnder Interferometer and Phi-OTDR based voice acquisition distributed fiber sensing system comprises a laser, a first coupling, a light modulator, a first fiber amplifier, a fiber circulator, a second fiber amplifier, a first photoelectric detector, a second coupling, a third coupling, a fiber pickup box, a second photoelectric detector, a data acquisition processing module and a four-core detection fiber, wherein the second coupling and the third coupling form a Mach-Zehnder Interferometer system. The voice acquisition function is achieved by the pickup box, the fiber circulator and the four-core detection fiber form a Phi-OTDR, and the disturbed fiber sensing function is achieved; by the sensing system, the functions of voice acquisition and distributed fiber sensing are achieved; and meanwhile, the same four-core detection fiber is shared, and thefiber resource utilization ratio is improved.

Description

technical field [0001] The invention relates to the technical field of distributed optical fiber sensing, in particular to a sound collecting distributed optical fiber sensing system based on Mach-Zehnder interferometer and φ-OTDR. Background technique [0002] Distributed optical fiber sensing systems are currently widely used in peripheral security, electric power, coal mines, transportation and other fields. They can monitor system changes in real time and play an important role in maintaining the normal operation of the system and protecting people's lives and property. [0003] The principle of the current distributed optical fiber sensing system is: the optical signal emitted by the laser is modulated into a pulse signal and injected into the detection fiber, and the optical signal will generate backscattered light in the detection fiber; when a disturbance occurs somewhere in the detection fiber, it will The backscattered light is converted, and the vibration informat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00G01D5/353
CPCG01D5/35329G01D5/35354G01H9/004
Inventor 秦增光王恒刘兆军丛振华李钊渠帅
Owner SHANDONG UNIV
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