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Optical fiber temperature measuring instrument

An optical fiber temperature and measuring instrument technology, applied in the field of sensing, to achieve the effect of compact structure and high measurement accuracy

Inactive Publication Date: 2006-08-02
NANKAI UNIV
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  • Abstract
  • Description
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Problems solved by technology

Applicable to various contact temperature signal measurement

Method used

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  • Optical fiber temperature measuring instrument
  • Optical fiber temperature measuring instrument
  • Optical fiber temperature measuring instrument

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Embodiment

[0038] The working wavelength band of the light source 1 is 1500-1540nm. The center wavelength of the tilted fiber grating 4 is 1520nm, and the bandwidth is 30nm. The reflectance at the center wavelength is 90%. The light guide device 5 adopts a refractive index matching liquid, and the optical lens 6 adopts a cylindrical lens with a focal length of 15 cm. The photodetection array 7 adopts a CCD linear array, its response center wavelength is 1510, and its response bandwidth is 50nm. The single-mode optical fiber 9 is a single-mode optical fiber with a wavelength of 1550nm.

[0039] In actual application, the light source 1 is connected with the optical splitter 2 , the optical fiber temperature sensor 3 and the tilted optical fiber grating 4 correspondingly by a single-mode optical fiber 9 . The tilted fiber grating 4 is immersed in the refractive index matching liquid 5, and the position of the optical lens 6 is adjusted so that it can converge the light within the workin...

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Abstract

The present invention relates to an optical fibre temperature- measuring instrument, in particular, it relates to a measuring instrument that is used for measuring temperature signal and uses optical fibre and oblique optical fibre grating as sensing matrix. Said optical fibre temperature measuring instrument includes light source, monomode fibre and microprocessor, etc. It is characterized by that it uses optical fibre Fabry-Perot interference cavity as temperature sensing element.

Description

technical field [0001] The invention relates to an optical fiber temperature measuring instrument, in particular to an optical fiber and an inclined optical fiber grating as a sensing matrix used for measuring temperature signals, and belongs to the field of sensing technology. Background technique [0002] Fiber Bragg Grating is a new type of photonic device, which is a spatially periodic refractive index distribution established in the optical fiber, which can change and control the propagation behavior of light in the optical fiber. Slanted fiber gratings use a special writing method to write gratings that form a certain angle with the fiber axis in the core of the fiber. Thereby, light of a specific wavelength range can be coupled from the fiber core into the fiber cladding. [0003] The principle of the fiber optic Fabry-Perot (F-P) temperature sensor is a fiber optic Fabry-Perot (F-P) interference cavity. It uses a certain device to convert the change of the measured...

Claims

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Application Information

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IPC IPC(8): G01K11/32G01K11/3206
Inventor 刘波开桂云董孝义刘艳格袁树忠
Owner NANKAI UNIV
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