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

A botdr signal demodulation method

A signal demodulation and signal technology, applied in the field of photoelectric detection, can solve the problems of low sensitivity and resolution, low BOTDR signal demodulation sensitivity, etc., and achieve the effects of improving demodulation sensitivity, novel design and improving resolution

Inactive Publication Date: 2016-07-27
NORTHEASTERN UNIV LIAONING
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the effect of Fresnel reflection and Rayleigh scattering is suppressed by the method of controlling the arm length difference, and the sensitivity of the interferometer is related to the difference of the interference arm length in the ordinary Mach-Zhender interferometer, this method has no effect on the BOTDR signal The demodulation sensitivity is not high, which leads to low sensitivity and resolution of the measurement system to the measured

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
  • A botdr signal demodulation method
  • A botdr signal demodulation method
  • A botdr signal demodulation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] The specific structure, principle and demodulation method of the present invention will be further described below in conjunction with the accompanying drawings.

[0016] figure 1 It is a schematic diagram of the overall principle structure of the BOTDR signal demodulation method provided by the present invention. The output signal of the BOTDR sensing unit 1 enters the signal demodulation unit 2, and the Stokes light wavelength (frequency) in the output signal light of the BOTDR sensing unit 1 is demodulated by the signal demodulation unit 2, and the output signal of the signal demodulation unit 2 passes through The signal processing unit 3 is shown.

[0017] In the BOTDR signal demodulation system proposed by the present invention, the phase sensitivity expression of the Mach-Zhender interferometer used to demodulate the Stokes optical frequency is:

[0018] S I = dΔθ dω = ...

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

A novel BOTDR (Brillouin Optical Time Domain Reflectometer) signal demodulating method belongs to the field of photoelectric detection techniques. The method comprises a BOTDR sensing unit 1, a signal demodulating unit 2 and a signal processing unit 3, wherein the BOTDR sensing unit 1 comprises a light source 10, a modulator 12, a signal generator 13, an erbium-doped fiber amplifier 16, an optical fiber circulator 17 and a distributed measuring optical fiber 18; the signal demodulating unit 2 comprises an Mach-Zhender interferometer for demodulating the BOTDR signals; and the signal processing unit 3 comprises a detector 30 and an oscilloscope 32. The method is characterized in that a Gaussian type inhomogeneous fiber Bragg grating 21 is introduced in an interference arm of the Mach-Zhender interferometer, the filtering characteristic of the fiber Bragg grating 21 is utilized to weaken the noise light intensity; and meanwhile, the characteristic that the fiber Bragg grating 21 can generate slow light is utilized to improve the sensitivity of the Mach-Zhender interferometer.

Description

technical field [0001] The invention relates to a BOTDR signal demodulation method, which belongs to the technical field of photoelectric detection. Background technique [0002] The distributed optical fiber sensor based on Brillouin Optical Time Domain Reflectometry (BOTDR) technology is a widely used distributed sensor. The key technology is to perform real-time dynamic demodulation of the frequency of Stokes light in the output signal light generated by the BOTDR sensing unit. The traditional BOTDR signal demodulation method adopts the coherent self-heterodyne method. By coherently coherent the BOTDR signal returned by the distributed measurement fiber with the reference optical signal, and then demodulates the frequency of the BOTDR signal at different times. However, in the traditional BOTDR signal demodulation method, due to the need to build an optical path to move the frequency of the optical signal emitted by the light source, this method not only has a complex op...

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 Patents(China)
IPC IPC(8): G01D5/353
Inventor 赵勇张亚男韩博
Owner NORTHEASTERN UNIV LIAONING
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