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

Method used for measuring temperature and strain simultaneously and based on brillouin scattering

A technology of Brillouin scattering and measurement method, which is applied in the field of measurement, can solve the problems of not being able to measure temperature and strain at the same time, limiting the sensing distance of the system, and failing to effectively improve the signal-to-noise ratio of the system, so as to reduce the measurement time, The effect of improving the measurement spatial resolution and increasing the sensing distance

Active Publication Date: 2015-06-24
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the method overcomes the contradiction between the spatial resolution of the system and the measurement accuracy, it cannot realize the simultaneous measurement of temperature and strain, and cannot effectively improve the signal-to-noise ratio of the system, which limits the sensing distance of the entire system

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
  • Method used for measuring temperature and strain simultaneously and based on brillouin scattering
  • Method used for measuring temperature and strain simultaneously and based on brillouin scattering
  • Method used for measuring temperature and strain simultaneously and based on brillouin scattering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024]The technical solution of the present invention is: the light emitted by the narrow linewidth laser LD is output through the polarization maintaining coupler C1, one path of light is used as local oscillator light, and the other path of light is modulated into stepped light by an optical modulator (Electro-Optic Modulator, EOM) pulse. The pre-pump pulse light with a width greater than the phonon lifetime first enters the sensing fiber FUT to pre-excite the acoustic wave, and generates a self-published Liouin scattering signal, while the frequency of the sensing pulse light with a width smaller than the phonon lifetime remains unchanged, and the sensing pulse light The spontaneous Brillouin scattering generated by the pre-pump pulse light is amplified by stimulated Brillouin scattering (Stimulated Brillouin Scattering, SBS), and the Brillouin scattering spectrum (Brillouin Scattering Spectrum, BSS) returned to the incident end is obtained by the spectrum The BSS generated...

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

PropertyMeasurementUnit
wavelengthaaaaaaaaaa
Login to View More

Abstract

A method used for measuring temperature and strain simultaneously and based on brillouin scattering adopts one measuring system. The measuring system comprises a narrow linewidth laser, a polarization-maintaining coupler, an optical coupler, an optical modulator, an optical amplifier, a circulator, a photoelectric detector and a brillouin frequency shift and strength testing unit. A first optical port of the polarization-maintaining coupler is connected with the laser. A third optical port of the polarization-maintaining coupler is connected with a first optical port of the circulator through the optical modulator and the optical amplifier sequentially. A second optical port of the circulator is connected with sensor fiber, a third optical port of the circulator is connected with a first optical port of the optical coupler, a fourth optical port of the polarization-maintaining coupler is connected with a second optical port of the optical coupler, and a third optical port of the optical coupler is connected with the brillouin frequency shift and strength testing unit through the photoelectric detector. Under the premise that system measuring precision is not reduced, resolution ratio of a measuring space is improved, simultaneously signal to noise ratio of the system can be improved, sensing distance is increased, and measuring time is reduced.

Description

technical field [0001] The invention relates to a method for simultaneously measuring temperature and strain by using a Brillouin optical time domain reflection system, which belongs to the field of measurement technology. Background technique [0002] Brillouin distributed optical fiber temperature and strain simultaneous measurement technology has the unique advantages of obtaining distribution information along the entire optical fiber measured field with only one measurement, high measurement accuracy, accurate positioning, and a distance of tens of kilometers. It has broad application prospects in online monitoring of the health status of large-scale engineering structures in industries such as construction, water conservancy, and fault location. The Brillouin Optical Time Domain Reflectometer (BOTDR) is a fully distributed optical fiber sensing system based on Brillouin scattering, which uses the frequency of Brillouin backscattered light in the sensing fiber The line...

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): G01D5/36G01B11/16G01K11/32G01K11/3206G01K11/322
Inventor 李永倩李晓娟
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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