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Distributed optical fiber temperature sensor with high spatial resolution power

A distributed optical fiber, high spatial resolution technology, applied in the field of optoelectronics

Inactive Publication Date: 2005-12-07
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Abstract
  • Description
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Problems solved by technology

[0005] As far as the inventor knows, there is no report in the prior art that the white light interferometric scanning Michelson interferometer is used to realize the temperature distribution of the entire optical fiber through a specially designed sensor head

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  • Distributed optical fiber temperature sensor with high spatial resolution power
  • Distributed optical fiber temperature sensor with high spatial resolution power
  • Distributed optical fiber temperature sensor with high spatial resolution power

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Embodiment Construction

[0046] A Distributed Optical Fiber Temperature Sensor with High Spatial Resolution

[0047] Such as figure 2 shown. The light source and photodetector use SLD and Pin photodetectors with a wavelength of 1.29 μm and a spectral width of 36 nm produced by Electronic Technology Group Corporation 44. The sensing fiber is a polarization-maintaining fiber with a beat length of 2.6 mm and a mode field diameter of 6 μm produced by 41. The prism analyzer is a Thompson prism with an extinction ratio of 50dB produced by the Laser Research Institute of Qufu University. If an SLD with a spectral width of 36nm and a central wavelength of 1.29μm is used as the light source, the dispersion parameter D is 600ps / km, and the beat length is L B A 2.6mm polarization-maintaining fiber is used as the sensing fiber. According to the calculation, the spatial resolution is 10cm, and the corresponding optical path difference of the Michelson interferometer is 10μm.

[0048] A sensing head was made w...

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Abstract

This invention provides a high space resolution distributed fiber temperature sensor composed of a polarization maintaining fiber with a sensor head and a Michelson interferometer, among which, said fiber is formed by putting a cylindrical material of layer thermal expansion coefficient and a polarization maintaining fiber in a tube material of small thermal expansion coefficient. This invention utilizes white light interference polarization mode coupling theory to test the temperature signal of polarization maintaining fiber with a sensor head by scanning a Michelson interferometer to realize the high space resolution measurement. Temperature distribution along the polarization maintaining fiber can be accurately tested since a special sensor head is applied.

Description

technical field [0001] The invention belongs to the technical field of optoelectronics, and in particular relates to the distributed optical fiber sensor technology. technical background [0002] Most distributed fiber optic temperature sensors are based on the scattering principle of light, such as Rayleigh scattering, Raman scattering and Brillouin scattering, which measure the temperature distribution through backscattered light in the optical fiber. Among them, the distributed temperature sensing technology based on Raman scattering is the most mature technology in the distributed optical fiber sensing technology. Some products have appeared in the international and domestic markets. The most famous one is the DTS80 of York Company in the UK. Its spatial resolution and temperature resolution can reach 1m and ±1°C respectively, and the measurement range is 4-8km. Due to the extremely weak intensity of Raman scattered light, it is extremely difficult to achieve a spatial ...

Claims

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Application Information

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IPC IPC(8): G01K11/32
Inventor 周晓军龚俊杰
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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