Pulse coding fiber Brillouin optical time domain analyzer

A technology of optical time domain analysis and pulse coding, which is applied to instruments, scientific instruments, optical devices, etc., can solve problems such as technical difficulties, and achieve the effects of improving spatial resolution, increasing gain, and improving signal-to-noise ratio.

Inactive Publication Date: 2012-01-18
CHINA JILIANG UNIV
View PDF5 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fiber Brillouin optical time-domain analyzer requires strictly locking the frequencies of the narrow-band probe laser and the narrow-band pump laser, which is technically difficult

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
  • Pulse coding fiber Brillouin optical time domain analyzer
  • Pulse coding fiber Brillouin optical time domain analyzer
  • Pulse coding fiber Brillouin optical time domain analyzer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0039] refer to figure 1, the pulse-coded optical fiber Brillouin optical time-domain analyzer of the present invention includes a pulse-coded waveform generator 10, a narrowband single-frequency fiber laser 11, an optical fiber splitter 12, an optical pulse code modulator 13, and two optical fiber circulators 14 , 15, heterodyne receiver 16, digital signal processor 17, fiber grating filter 18, sensing fiber 19, optical fiber Raman pump laser 20 and industrial computer 21, the input end of pulse code waveform generator 10 and industrial computer 21 connected, the output end of the pulse code waveform generator 10 is connected with an input end of the optical pulse code modulator 13, the input end of the fiber splitter 12 is connected with the narrowband single-frequency fiber laser 11, and an output of the fiber splitter 12 end is connected with the other input end of the optical pulse code modulator 13, the other output end of the optical fiber splitter 12 is connected with...

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
isolationaaaaaaaaaa
wavelengthaaaaaaaaaa
poweraaaaaaaaaa
Login to view more

Abstract

The invention discloses a pulse coding fiber Brillouin optical time domain analyzer which comprises a pulse coding waveform generator, a narrow-band single-frequency fiber laser, a fiber shunt, an optical pulse coding modulator, two fiber circulators, an heterodyne receiver, a digital signal processor, a fiber bragg grating filter, a sensing fiber, a fiber Raman pump sensor and an industrial personal computer. The sensor adopts a time sequence to code laser pulse to improve the spatial resolution by reducing laser width while the transmission photon number is improved; a continuously operated fiber Raman pump laser serves as a pump light source to overcome the difficulty that the Brillouin optical time domain analyzer needs to strictly lock the frequency of a detection laser and a pump laser; and strong laser generated by the continuously operated fiber Raman pump laser is amplified by stimulated Raman scattering light in a sensing fiber instead of being amplified by the narrow-band Brillouin, the gain of the back coherent amplification stimulated Brillouin scattering can be increased, the signal to noise ratio is improved, the measurement precision is improved, and the measurement length is increased.

Description

Technical field [0001] The present invention involves pulse encoding optical fiber Boriyuan time domain analyzer, which is a distributed fiber sensor technology field. Background technique [0002] In the field of optical fiber Boriyuan time domain analysis, optical fiber Boriyuan time domain reflector 釆 uses the optical fiber's spontaneous Buryyuan scattering, so it is weak to the back of the Boriyuan scattering signal.The accuracy of frequency and intensity is very low to measure the accuracy of the shouldbids and temperature, the process is short, and the space resolution is low.T.Horiguchi and others invented the Bourry Optical Domain analyzer, adding a related pump laser to the other end of the fiber to achieve Bouri amplification.System signal -to -noise ratio.However, the frequency of the optical fiber Boriyuan time domain analysis requires the frequency of the narrowband detection laser and the narrowband pump laser, which is technically difficult.In recent years, the saf...

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): G01D5/353G01B11/16G01K11/32G01K11/322
Inventor 张在宣余向东龚华平王剑锋
Owner CHINA JILIANG UNIV
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