Distributed optical fiber vibration detection system

A distributed optical fiber and detection system technology, which is applied in the direction of measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problems of single-mode optical fiber polarization fading, distributed optical fiber vibration detection instruments, etc. The probability of false positives and the effect of eliminating missed detection of intrusion signals

Inactive Publication Date: 2020-11-10
WUXI KEY SENSOR PHOTONICS TECH
View PDF4 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the existing single-mode optical fiber has birefringence and polarization fading phenomenon, which leads to the technical problem that the distributed optical fiber vibration detection instrument has a high probability of false positives

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Distributed optical fiber vibration detection system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0008] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0009] As shown in the figure, the distributed optical fiber vibration detection system of the present invention includes a detection optical cable, a laser light source, a first coupler, an acousto-optic modulator, an erbium-doped fiber amplifier, a circulator, a second coupler, a balance detector, an information acquisition Card, pulse generator, 1×N and data processing unit; the first coupler divides the incident light generated by the laser light source into two paths, and the first path passes through the acousto-optic modulator, erbium-doped fiber amplifier, circulator and 1 ×N enters the detection optical cable; the other path is coherent with the Rayleigh scattered light in the second coupler and then input to the balance detector, the acquisition card collects the data and sends it to the data processing unit, where the pulse generator...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a distributed optical fiber vibration detection system. N optical fibers in a detection optical cable are connected in parallel by using a 1 * N optical switch to form N repeatedly arranged detection optical fibers; when a certain point on the optical cable vibrates, through the switching of the optical switch, N points at the same position on the N optical fibers connectedin parallel can be scanned, the vibration can be detected (at the moment, the polarization states of the vibration points of the detection optical fibers are different), and the system gives an alarmas long as a vibration invasion signal is detected at the point on one optical fiber. The probability of polarization fading of one detection point is assumed to be 1%, and when N points detect the point at the same time, the probability of polarization fading is only 0.01 N, so that the probability of missing report is greatly reduced, and the phenomenon of intrusion signal missing detection caused by polarization fading can be basically eliminated.

Description

technical field [0001] The invention relates to the technical field of distributed optical fiber vibration detection, in particular to a detection method for reducing missed signal detection caused by polarization fading. Background technique [0002] With the advancement of technology, distributed optical fiber vibration detection technology is more and more widely used in pipeline leak detection, pipeline anti-excavation and various perimeter security. Due to the birefringence phenomenon in the single-mode fiber, it will cause the polarization state of the output light in the fiber link to fluctuate and cause polarization fading, which is specifically manifested as random fluctuations in the amplitude of the beat-frequency coherent signal of the Rayleigh scattering signal light and the reference light. Sometimes it will be impossible to detect the beat frequency coherent signal, that is, the amplitude of the coherent signal strength at some positions will be close to 0, re...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 徐方辰张亮
Owner WUXI KEY SENSOR PHOTONICS TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap