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Compound interference type distributed optical fiber vibration sensing system and sensing method thereof

A vibration sensing system and distributed optical fiber technology, applied in the field of sensing, can solve problems such as limited sensitivity and poor system linearity, and achieve the effects of low light source requirements, sensitive vibration signals, and convenient signal processing.

Inactive Publication Date: 2009-10-07
BEIJING HUAJUN JUNAN INFORMATION 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

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  • Compound interference type distributed optical fiber vibration sensing system and sensing method thereof
  • Compound interference type distributed optical fiber vibration sensing system and sensing method thereof
  • Compound interference type distributed optical fiber vibration sensing system and sensing method thereof

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Embodiment Construction

[0027] like Figure 1-4 As shown, the present invention is a composite interference type distributed optical fiber vibration sensing system, which is mainly composed of a sensing system 1 for sensing external vibration events and a detection and control system 2 for detecting and controlling vibration signals. System 1 is a double Sagnac fiber interferometer, which is mainly composed of a light source, a first coupler that divides one light from the light source into two paths of light B and C propagating through the B-path fiber and the C-path fiber, and divides B and C. The two paths of light are respectively divided into a second coupler for D and E two paths of light propagating through D path fibers and E path fibers, and a first phase modulator and a second phase modulator for receiving B, C, D, and E four paths of light. It consists of a detector, a first mirror connected with the first phase modulator, and a second mirror connected with the second phase modulator; the ...

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Abstract

The invention discloses a compound interference type distributed optical fiber vibration sensing system and the sensing method thereof. The sensing system is a loop mainly connected by a sensing system for sensing the extraneous vibration event and a detection-control system for detecting and controlling vibration signal; the sensing system is double Sagnac optical fiber interferometers; and the detection-control system is composed of a detection system and a control system by connection; The invention is sensitive for vibration signal, has high detection precision and very high space resolving power; Compared with the current technologies, the system achieves the advantages of simple structure, low requirement to light source and convenient signal processing.

Description

technical field [0001] The invention relates to the field of sensing technology, and relates to a composite interference type distributed optical fiber vibration sensing system and a sensing method thereof. Background technique [0002] Sensing alarm systems such as perimeter security, border defense, earthquake detection and tsunami warning play a huge role in ensuring people's life stability 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, optical fiber sensing technology is increasingly used in the sensing field, gradually replacing some traditional electrical sensors. Because the essential characteristics of optical fiber are sensitive to signals such as vibration, stress and sound waves, optical fiber-based vibration sensing technology, especially distributed sensing, has attracted the attention of scientific and technolog...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00G01D5/353
Inventor 齐龙舟刘亮皋魏席刚尚利军周正仙仝芳轩王青
Owner BEIJING HUAJUN JUNAN INFORMATION TECH
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