Multiple Raman scattering effect fused ultra remote fiber temperature measurement sensor
A technology of optical fiber temperature measurement and Raman scattering, which is applied in the field of ultra-long-distance optical fiber temperature measurement sensors, can solve problems such as not fully meeting urgent needs, and achieve the effects of simple structure, improved signal-to-noise ratio, and reduced difficulty
Inactive Publication Date: 2013-04-03
CHINA JILIANG UNIV
View PDF5 Cites 1 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
In 2009, Zhang Zaixuan proposed the invention patent of "Fully Distributed Optical Fiber Rayleigh and Raman Scattering Photon Strain and Temperature Sensor", using temperature-sensitive anti-Stokes scattering light intensity and Rayleigh scattering light intensity or Stokes scattering The ratio of light intensity is used to obtain temperature information. This method can overcome the measurement error caused by light source fluctuations, but it is only suitable for medium and short-range 100m-15km online temperature monitoring, which cannot fully meet the long-distance monitoring requirements of oil pipelines and transmission power cables in recent years. , Urgent demand for ultra-remote distributed fiber optic Raman temperature sensors
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0011] The present invention will be further described below in conjunction with the accompanying drawings.
[0012] see figure 1 As shown, the ultra-long-distance optical fiber temperature measurement sensor fused with multiple Raman scattering effects includes an optical fiber pulse laser 10, an optical fiber splitter 11, an optical fiber Raman frequency shifter composed of a single-mode optical fiber 12 and an optical fiber filter 13, and the extension Optical fiber 14, optical fiber multiplexer 15, optical fiber wavelength division multiplexer 16, optical fiber coupler 17, Raman laser 18, sensing optical fiber 19, optical fiber reflection filter A20, optical fiber reflection filter B21, photoelectric receiving module 22, digital signal processor 23 and industrial computer 24.
[0013] The input port of fiber splitter 11 is connected with fiber pulse laser 10, and two output ports are connected with single-mode fiber 12, delay fiber 14 respectively; Two input ports of fibe...
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
| Property | Measurement | Unit |
|---|---|---|
| wavelength | aaaaa | aaaaa |
| wavelength | aaaaa | aaaaa |
| isolation | aaaaa | aaaaa |
Login to View More
Abstract
The invention discloses a multiple Raman scattering effect fused ultra remote fiber temperature measurement sensor. By utilizing 1660 nm wave band wide spectrum laser generated by a Raman frequency shifter as a light source for system measurement, combined with a Raman amplification effect, and the system light source is amplified to increase a length of a sensing fiber capable of measuring temperature. Anti-Stokes light with temperature information generated in the sensing fiber is amplified by a Raman amplifier of a C wave band, through a coupled narrowband optical filter, Rayleigh scattering light is removed, and the temperature information on the sensing fiber is obtained after demodulation. The invention has the following advantages: after a 1660 nm system light source is subjected to Raman amplification, a temperature measurement length of the sensing fiber is raised, and after anti-Stokes Raman light with the temperature information is moved to a 1550 nm fiber low loss area, combined with the Raman amplifier of a C wave band, a signal to noise ratio of a system is raised. The system is applied to calamity forecasting and monitoring of a petrochemical pipeline, a tunnel and the like of an ultra remote distance of 100 kilometers or more.
Description
technical field [0001] The invention belongs to the field of distributed optical fiber sensing temperature measurement, and relates to an ultra-long-distance optical fiber temperature measurement sensor integrated with multiple Raman scattering effects. The system is suitable for remote 100km and above occasions that require real-time disaster monitoring. technical background [0002] In recent years, the use of optical fiber distributed sensors to realize online real-time forecasting of on-site temperature and its changing trend has attracted extensive attention and research based on the advantages of simple operation and applicability to harsh environments. This type of sensor uses the effect of optical fiber Raman scattered light intensity modulated by temperature and the principle of optical time domain reflection to realize temperature monitoring, which can be used for safety and health monitoring and disaster forecasting and monitoring for petrochemical industry, traff...
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
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/32G01K11/324
Inventor 康娟张在宣李晨霞张文平王剑峰沈常宇董新永金尚忠
Owner CHINA JILIANG UNIV