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Optical raster temp senser and its mfg. method

A technology of temperature sensor and optical fiber grating, which is applied in the direction of radiation pyrometry, instruments, scientific instruments, etc., can solve problems such as the influence of temperature measurement, and achieve the effect of solving interactive sensitive problems

Inactive Publication Date: 2005-01-12
TIANJIN UNIV
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Problems solved by technology

However, because the grating is bonded to the metal, when the sensor is fixed with the object to be measured or embedded in a structure such as concrete, the strain generated by the object to be measured will be transmitted to the sensor through the metal and the cured adhesive. Fiber Bragg gratings, making them interactively sensitive to external strains, which affect temperature measurements

Method used

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  • Optical raster temp senser and its mfg. method
  • Optical raster temp senser and its mfg. method

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Embodiment Construction

[0016] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings. as attached figure 1 As shown, the optical fiber coating layer is removed at a section of the optical fiber 1 having photosensitivity and a fiber grating 4 is written using a mask or an interference method. In order to make the fiber grating 4 have good temperature stability and long service life, the fiber grating 4 can be annealed or otherwise aged. Process a metal with good thermal conductivity and mechanical properties, such as stainless steel, into a shape with a cavity inside, and firmly bond the optical fiber lead-out end of the fiber grating 4 to both ends of the metal cavity 3 with an adhesive. The part inside the cavity that includes the fiber grating 4 is not subjected to axial tension, or slightly compressed in the axial direction, so that the optical fiber inside the cavity but not including the fiber grating 4 is sl...

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Abstract

The sensor is composed of metal cavity, fiber grating or fiber grating pasted on metal bar or metal tube inside the cavity, leading out ends of optical fiber, and heat conducting powder or paste filled to space between fiber and cavity. The preparing method includes following steps: putting fiber grating into metal cavity; fixing two ends of fiber on two ends of the cavity; filling heat conducting powder or paste to space between fiber and cavity. The invention solves issue of interactive sensitivity to external strain, providing high precision for measuring temp.

Description

technical field [0001] The invention relates to an optical fiber grating temperature sensor and a manufacturing method thereof, in particular to an optical fiber grating temperature sensor insensitive to external stress or strain and a manufacturing method thereof, belonging to the field of optical fiber sensing. Background technique [0002] As an all-fiber device, Bragg grating (FBG for short) has been more and more widely used in the fields of optical fiber communication and optical fiber sensing. FBG sensor has significant advantages such as anti-electromagnetic interference, corrosion resistance, long service life, small size, and can realize multi-point distribution measurement by optical wavelength multiplexing, so it plays a huge role in occasions where traditional sensors cannot be used. In recent years, with the continuous development of FBG sensing technology, its application range is also expanding, and it has begun to replace traditio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J5/08
Inventor 李恩邦习江涛奇卡罗姚建铨
Owner TIANJIN UNIV
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