Disturbing signal detecting system based on bidirectional Mach Zehnder heterodyne interferometer

A technology for disturbing signals and detection systems, applied in instruments, measuring devices, measuring ultrasonic/sonic waves/infrasonic waves, etc., can solve the problems of inability to complete real-time detection and positioning, slow response speed, etc., achieve high reliability, reduce impact, Effect of suppressing interference from low-frequency noise

Inactive Publication Date: 2007-08-01
BEIHANG UNIV
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Problems solved by technology

Distributed optical fiber sensors based on the principle of optical time domain reflectometer (OTDR), such as sensors for measuring temperature and pressure, have slow response speeds and cannot complete real-time detection and positioning

Method used

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  • Disturbing signal detecting system based on bidirectional Mach Zehnder heterodyne interferometer
  • Disturbing signal detecting system based on bidirectional Mach Zehnder heterodyne interferometer
  • Disturbing signal detecting system based on bidirectional Mach Zehnder heterodyne interferometer

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Embodiment Construction

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0026] Please refer to Fig. 1, the present invention is a disturbance signal detection system based on a two-way Mach-Zehnder interferometer, which consists of a distributed optical fiber sensor and a signal detection circuit, and the distributed optical fiber sensor includes a first detector 1 , the second detector 2, the light source 3 and three couplers (coupler A4, coupler B5, coupler C6), the pigtail of the light source 3 is fused with the transmission A end of the coupler A4; the transmission B end of the coupler A4 The transmission end D of the coupler B5 is fused through a single-mode fiber, the transmission C end of the coupler A4 is fused with the transmission C end of the coupler C6 through a single-mode fiber; the transmission A end of the coupler B5 is connected to the first detection end through a single-mode fiber Connector 1 is fused, the tran...

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Abstract

This invention discloses one interference signal test system based on double direction Mach interometer, which comprises distribution fiber sensor and signal test circuit, wherein, the sensor comprises first detector, second detector, light source and three couplers; the said interference signalphi(t) to first detector time t1 difference from second detector time t2+t3 to get vibration point O real position according to the time lag.

Description

technical field [0001] The invention relates to a device for detecting disturbance (vibration) signals, more particularly, a disturbance signal detection system based on a two-way Mach-Zehnder interferometer. Background technique [0002] The distributed optical fiber micro-disturbance sensor can measure the disturbance information that changes with time along the entire length of the optical fiber. It has the advantages of high sensitivity, long detection distance, strong anti-electromagnetic interference ability, and easy maintenance after installation. It has become one of the most promising technologies in the field of long-distance pipeline monitoring and security defense. Distributed optical fiber sensors based on the principle of optical time domain reflectometer (OTDR), such as sensors for measuring temperature and pressure, have slow response speeds and cannot complete real-time detection and positioning. Especially in the field of long-distance pipeline monitoring...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00G01D5/353
Inventor 李立京罗光明李琛徐宏杰林文台蓝天韩晓娟彭良玉
Owner BEIHANG UNIV
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