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Defense area optical fiber distribution type vibration sensor and perimeter alarm system adopting same

An optical fiber distributed, vibration sensor technology, applied in the field of photoelectric sensing, can solve problems such as unreliable optical fiber vibration sensing, and achieve the effects of avoiding polarization fading phenomenon, high practicability, and stable visibility.

Inactive Publication Date: 2010-10-27
北京奥普科达科技有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0016] The embodiment of the present invention provides an anti-zone optical fiber distributed vibration sensor to solve the problem that the optical fiber cannot be reliably used for vibration sensing in the prior art

Method used

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  • Defense area optical fiber distribution type vibration sensor and perimeter alarm system adopting same
  • Defense area optical fiber distribution type vibration sensor and perimeter alarm system adopting same
  • Defense area optical fiber distribution type vibration sensor and perimeter alarm system adopting same

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Embodiment Construction

[0033] Since relatively low-cost single-mode optical fibers are usually used in existing interferometer-type optical fiber distributed vibration sensors, there is a problem of signal fading caused by polarization-induced birefringence. The embodiment of the present invention improves the existing Sagnac interferometer to provide a stable anti-area optical fiber distributed vibration sensor. In this sensor, the polarization-induced birefringence introduced in the single-mode optical fiber is solved by depolarization technology. The problem of signal fading, and it provides a new feasible solution for the fiber optic perimeter alarm system.

[0034] The main realization principles, specific implementation modes and corresponding beneficial effects that can be achieved of the technical solutions of the embodiments of the present invention will be described in detail below in conjunction with each accompanying drawing.

[0035] image 3 Shown is a schematic diagram of an existing...

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Abstract

The invention discloses a defense area optical fiber distribution type vibration sensor comprising a light source, a first transmission optical fiber, a second transmission optical fiber, a coupler provided with at least four coupling arms, a first depolarizer, a second depolarizer, a delay loop, a U-shaped sensing optical fiber loop and a signal receiving and processing module, wherein two ends of the first transmitting optical fiber are respectively connected with the light source and the first coupling arm of the coupler; two ends of the second transmitting optical fiber are respectively connected with the signal processing module and the second coupling arm of the coupler; the third coupling arm of the coupler is connected with one end of the first depolarizer; the fourth coupling arm of the coupler is connected with one end of the second depolarizer; and the delay loop and the U-shaped sensing optical fiber loop are connected in series between the other end of the first depolarizer and the other end of the second depolarizer. The sensor avoids the phenomena of polarization and fading caused by stress double refraction in the single mode fiber and provides a new feasible scheme for an optical fiber perimeter alarm system.

Description

technical field [0001] The invention relates to the technical field of photoelectric sensing, in particular to an area-defense optical fiber distributed vibration sensor and a perimeter alarm system using the sensor. Background technique [0002] As a new generation of perimeter alarm system, the fiber optic perimeter alarm system has strong military and civilian value. It can be used for perimeter security monitoring of prisons, important military targets, weapon depots, etc., and can also be used for perimeter security monitoring of important facilities such as communities, government agencies, nuclear power plants, and airports. [0003] The optical fiber perimeter alarm system mainly adopts optical fiber distributed vibration sensor, which analyzes the intrusion vibration information by monitoring the impact of environmental stress changes in a small boundary area on the optical fiber, and judges and alarms it. The fiber optic perimeter alarm system has the advantages t...

Claims

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Application Information

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IPC IPC(8): G01H9/00G08B13/00
Inventor 林明霞
Owner 北京奥普科达科技有限公司
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