Distributed optical fiber Raman temperature measurement system

A distributed optical fiber and Raman temperature measurement technology, which is applied to thermometers, measuring devices, and heat measurement, can solve the problem of degrading the real-time performance of the system, achieve fast processing speed, improve signal-to-noise ratio, and improve temperature measurement accuracy.

Active Publication Date: 2013-05-22
YANGTZE OPTICAL FIBRE & CABLE CO LTD
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a distributed optical fiber Raman temperature measurement system for the defects in the prior art that improving the signal-to-noise ratio of the distributed optical fiber Raman temperature measurement system seriously deteriorates the real-time performance of the system

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  • Distributed optical fiber Raman temperature measurement system
  • Distributed optical fiber Raman temperature measurement system
  • Distributed optical fiber Raman temperature measurement system

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Embodiment Construction

[0033] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0034] Such as figure 1 as shown, figure 1 It is a structural diagram of a distributed Raman temperature measurement system, including an all-fiber pulse laser, a wavelength division multiplexer, a sensing fiber, a dual-channel avalanche photodiode, and a DSP digital signal processor. The all-fiber pulsed laser used in this embodiment is a pulsed laser with a wavelength of 1550 nm and a pulse width of 10 ns. The all-fiber pulsed laser 10 sends out a pulsed laser with a wavelength of 1550 nm, which enters the sensing fiber to be tested after passing through the wavelength division multiplexer 11. ...

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Abstract

The invention relates to the field of distributed optical fiber temperature measurement systems, and discloses a distributed optical fiber Raman temperature measurement system. The system comprises a pulse laser device, a wavelength division multiplexer, a sensor optical fiber, a double-channel avalanche photodiode, and a digital signal processor (DSP). The whole optical fiber laser device emits pulse lasers, the pulse lasers enter into a to-be-tested sensor optical fiber after passing through the wavelength division multiplexer, the pulse lasers continuously generate backscattering inside the optical fiber in the spreading process, and then backscattering light returns back to the wavelength division multiplexer, after the backscattering light passes through the wavelength division multiplexer, Stokes scattering light and anti-Stokes Raman scattering light are respectively filtered out and enter the double-channel avalanche photodiode to be conducted photovoltaic conversion, and after an electrical signal of the double-channel avalanche photodiode is processes by the DSP, a temperature signal is obtained. The high-speed DSP is used for achieving wavelet denoising, and therefore processing speed is quick, and real time performance of temperature measurement is not influenced on the premise that precision is guaranteed.

Description

technical field [0001] The invention relates to the field of distributed optical fiber temperature measurement systems, in particular to a distributed optical fiber Raman temperature measurement system. Background technique [0002] The distributed optical fiber Raman temperature sensor uses the back Raman scattered light in the optical fiber as the sensing signal, which can cover the temperature field monitoring of the entire optical fiber and realize distributed temperature measurement. In road tunnels, high-voltage cables, underground coal mines and other places, it is necessary to monitor the temperature of tunnels, cables and underground in real time, otherwise, once a fire occurs, it will pose a threat to public property and even life. Distributed optical fiber Raman temperature sensors provide an effective solution for long-distance temperature field monitoring, and have been widely used in safety engineering. However, since the distributed optical fiber Raman temper...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/32G01K11/324
Inventor 李小兵郭江涛夏涛张睿彭定敏
Owner YANGTZE OPTICAL FIBRE & CABLE CO LTD
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