Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Distribution type optical fiber vibration detection method and system based on wavelength division multiplexing

A distributed optical fiber and wavelength division multiplexing technology, which is applied to measurement devices, uses wave/particle radiation, and measures ultrasonic/sonic/infrasonic waves, etc., which can solve the problem that the frequency and position information of vibration signals cannot be detected at the same time.

Active Publication Date: 2014-12-24
PIPECHINA SOUTH CHINA CO
View PDF5 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the technical problem that the simultaneous detection of vibration signal frequency and position information cannot be realized, the present invention provides a distributed vibration detection method and system based on wavelength division multiplexing technology

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
  • Distribution type optical fiber vibration detection method and system based on wavelength division multiplexing
  • Distribution type optical fiber vibration detection method and system based on wavelength division multiplexing
  • Distribution type optical fiber vibration detection method and system based on wavelength division multiplexing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Please see figure 1 , is the architecture diagram of the distributed optical fiber vibration detection system based on wavelength division multiplexing.

[0023] Wherein, the system specifically includes: an isolator, a first coupler 1, a delay fiber 2, a second coupler 3, a first wavelength division multiplexer 4, a sensing fiber 5, a second wavelength division multiplexer 6, Faraday rotator 7, first detector 8, first acquisition card 9, first data processor 10, modulator 11, first amplifier 12, circulator 13, second amplifier 14, filter 15, second detector 16, a second acquisition card 17, and a second data processor 18.

[0024] The following describes the connection relationship and function of each component.

[0025] Among them, the isolator is used to center wavelength λ 1 Broad-spectrum light source for processing.

[0026] The first coupler 1 is connected to the second coupler 3 through a delay fiber 2 , and the first coupler 1 is also directly connected to...

Embodiment 2

[0045] Please continue to read figure 1 , Sagnac sensor and Φ-OTDR sensor share a sensing fiber.

[0046] The center wavelength is λ 1 The wide-spectrum light source is used as the light source of the Sagnac sensor, and after being split by the first coupler 1, it becomes two beams of light (ie, the first beam and the second beam). Wherein, the first coupler 1 includes but is not limited to a 2×2 coupler with a splitting ratio of 1:1.

[0047] The first light beam enters the second coupler 3 after passing through the delay fiber, and the second light beam directly enters the second coupler 3 without passing through the delay fiber. Wherein, the second coupler 3 includes, but is not limited to, a 2×2 coupler with a splitting ratio of 1:1.

[0048] The main role of the delay fiber is to enhance the non-reciprocal effect in Sagnac.

[0049] The first light beam is transmitted from the second coupler 3, and after passing through the first wavelength division multiplexer 4, the...

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 distribution type optical fiber vibration detection method and system based on wavelength division multiplexing. A Sagnac sensing system is formed by a wide spectrum light source, a first coupler, a delay optical fiber, a second coupler, a first wavelength division multiplexer, a sensor fiber, a second wavelength division multiplexer, a Faraday rotator, a first detector and a first collection card to detect the frequency of a vibration signal; a phi-OTDR sensing system is formed by a narrow linewidth light source, a modulator, a first amplifier, a circulator, a second amplifier, a filter, a second detector, a second collection card, a second data processor, the first wavelength division multiplexer and the second wavelength division multiplexer to detect the generating position of the vibration signal. Therefore, simultaneous detection of the position and frequency of the vibration signal can be achieved.

Description

technical field [0001] The invention relates to the field of vibration signal detection, in particular to a distributed optical fiber vibration detection method and system based on wavelength division multiplexing. Background technique [0002] Large-scale engineering structure health monitoring, oil pipeline maintenance, and geological disaster prevention all need to collect vibration signals. Distributed optical fiber vibration sensors have become a research hotspot due to their incomparable advantages over traditional sensors. Distributed optical fiber vibration sensors use the vibration-sensitive characteristics such as output phase and polarization of light waves during optical fiber transmission to realize real-time detection of vibration signals around optical fibers. [0003] According to different sensing principles, distributed optical fiber vibration sensors can be divided into two categories: interference type and backscatter type. The optical fiber vibration se...

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
IPC IPC(8): G01H9/00
Inventor 周琰田孝忠谭东杰孙巍马云宾刘路孟佳邱红辉王海明蔡永军
Owner PIPECHINA SOUTH CHINA CO
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com