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Fiber glass raster stress temp sensor

A technology of temperature sensor and optical fiber grating, which is applied in the field of optoelectronic testing, can solve the problems of low sensitivity and measurement accuracy, difficult to distinguish compressive stress and tensile stress, etc., and achieve the effect of high sensitivity, good market prospect and simple structure

Inactive Publication Date: 2006-10-04
SHANGHAI JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the sensitivity and measurement accuracy of this structure are not high, and it is not easy to distinguish between compressive stress and tensile stress.

Method used

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  • Fiber glass raster stress temp sensor
  • Fiber glass raster stress temp sensor
  • Fiber glass raster stress temp sensor

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Embodiment Construction

[0040] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0041] The structure of the fiber grating stress temperature sensor of the present invention is as follows figure 1 As shown, it includes sensing probe optical fiber, insulating fixed frame and two insulating moving frames, and an F-shaped moving frame 5 and an L-shaped moving frame 6 are respectively fixed on the upper and lower frames of the fixed frame 4, and the two moving frames are mutually Arranged in a staggered manner, the sensing probe fiber is fixed on the fixed frame 4, and passes through the upper end of the fixed frame 4 and the interlaced parts of the two moving frames. Opened fiber grating, the first fiber grating 1 is mainly used to measure the stress type, whether it is compressive stress or tensile stress, the reflection spectrum peak wavelength of the second fiber grating 2 and the third fiber grating 3 are the same, mainly...

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Abstract

The disclosed sensor includes fiber of sensing probe, an insulative fixed frame and two insulative moving frames. An F shaped moving frame and an L shaped moving frame arranged in interlacing are installed on the fixed frame. Optical fiber of sensing probe passing through the interlaced part of the two moving frames is installed on the fixed frame. Three segments of fiber gratings positioned in interlaced and separated part of the two moving frames are made on fiber of sensing probe. First segment of fiber is in use for measuring stress. Two other segments of fiber gratings having same peak wavelength in reflectance spectrum are in use for measuring stress and temperature. Using principle of differential amplification, the invention raises measuring sensitivity, solves crossed sensitivity so as to be able to apply in high voltage and high electromagnetism harsh environment.

Description

technical field [0001] The invention relates to a fiber grating stress temperature sensor, in particular to a fiber grating sensor for simultaneously measuring stress and temperature, and belongs to the field of optoelectronic testing. Background technique [0002] Fiber Bragg grating sensor is a new type of sensor that measures the wavelength of the reflected spectrum. It can be used to measure parameters such as stress and temperature. It has high sensitivity and precision, anti-electromagnetic, radiation interference and many other excellent characteristics. It has been widely used in industry and construction. industry, aerospace and scientific research and other fields. [0003] Since the fiber grating is sensitive to temperature and strain at the same time, that is, the temperature and strain cause the change of the peak wavelength of the fiber grating at the same time, so the detection of the change of the peak wavelength of a single fiber grating cannot distinguish t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/353G01D21/02G01D5/26
Inventor 黄云刚殷宗敏
Owner SHANGHAI JIAOTONG UNIV
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