Distributed optical fiber vibration sensing system based on polarization beam splitting detection and sensing method

A technology of vibration sensing system and distributed optical fiber, which is applied in the direction of measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problems of limited sensitivity and poor linearity of the system, and achieve convenient signal processing and simple structure Effect

Active Publication Date: 2010-01-06
SHANGHAI BOOM FIBER SENSING TECH
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Problems solved by technology

The response range of this distributed sensor based on Sagnac interferometer to the vibration signal acting on the fiber depends on its position in the fiber ring, the closer to the center of the fiber ring, the smaller the response range, so the linearity of the system is poor, and the sensitivity is limited. limit

Method used

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  • Distributed optical fiber vibration sensing system based on polarization beam splitting detection and sensing method
  • Distributed optical fiber vibration sensing system based on polarization beam splitting detection and sensing method
  • Distributed optical fiber vibration sensing system based on polarization beam splitting detection and sensing method

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Embodiment 1

[0035] see figure 1 , the invention discloses a distributed optical fiber vibration sensing system based on polarization beam splitting detection, which includes a sensing system and a detection and control system.

[0036] 【Induction system】

[0037] The sensing system is used to sense external vibration events; it includes a light source, a pulse modulator, a circulator, a polarization beam splitter, a first amplifier, a second amplifier, a first filter, and a second filter.

[0038] The light source is used to emit continuous light. In this embodiment, the light source includes a connected laser driver and a laser; the laser driver is connected to a controller of the inspection and control system, receives a control signal from the controller, and thus drives the laser to emit laser light. . The pulse modulator is used to modulate the continuous light emitted by the light source into pulsed light; the circulator is used to inject the pulsed light into the sensing optical ...

Embodiment 2

[0059] In this embodiment, the sensing method of the above-mentioned distributed optical fiber vibration sensing system based on polarization beam splitting detection, the method includes the following steps:

[0060] The sensing step is to sense external vibration events; including:

[0061] (11) The light source emits continuous light;

[0062] (12) The pulse modulator modulates the continuous light emitted by the light source into pulsed light;

[0063] (13) The circulator injects pulsed light into the sensing optical cable;

[0064] (14) The polarizing beam splitter splits the backscattered light of the sensing cable output by the circulator into two beams with orthogonal polarization states of linearly polarized light;

[0065] (15) The first amplifier and the second amplifier amplify the two beams of linearly polarized light signals; the first filter and the second filter respectively filter the above-mentioned amplified signals;

[0066] The prosecution step is to de...

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Abstract

The invention discloses a distributed optical fiber vibration sensing system based on polarization beam splitting detection and a sensing method. The distributed optical fiber vibration sensing system comprises an induction system and a detection control system, wherein the induction system is used for inducing external vibration events and comprises a light source, a pulse modulator, a circulator, a polarization beam splitter, a first amplifier, a second amplifier, a first filter and a second filter; and the detection control system is used for detecting and controlling vibration signals and comprises a first detector, a second detector, a collector and a data processor, wherein the data processor is used for processing an output signal of the collector and analyzing the processed signal to select if giving an alarm. The distributed optical fiber vibration sensing system based on polarization beam splitting detection and the sending method is sensitive to the vibration signals, high detection precision and great high space resolution ratio; and in addition, compared with the prior art, the distributed optical fiber vibration sensing system has simple structure and convenient signal processing.

Description

technical field [0001] The invention relates to a distributed optical fiber vibration sensing system and sensing method, in particular to a distributed optical fiber vibration sensing system and sensing method based on polarization splitting detection. Background technique [0002] Sensing and alarm systems such as perimeter security, border prevention, earthquake detection, and tsunami early warning play a huge role in ensuring the stability of people's lives and protecting people's lives and property. The essence of such systems lies in the detection and analysis of vibration signals . With the development of optical devices and optical communications, fiber optic sensing technology is increasingly used in the field of sensing, gradually replacing some traditional electrical sensors. [0003] Due to the essential characteristics of optical fiber are sensitive to signals such as vibration, stress and sound waves, vibration sensing technology based on optical fiber, especia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08B21/00G01H9/00
Inventor 齐龙舟刘亮皋魏席刚周正仙仝芳轩
Owner SHANGHAI BOOM FIBER SENSING TECH
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