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Temperature sensor based on cascaded π-phase-shifted fiber Bragg gratings

A fiber optic Bragg and temperature sensor technology, applied in the field of temperature sensors, can solve problems such as difficult to change, achieve the effect of reducing loss and enhancing interference effect

Active Publication Date: 2018-12-07
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a typical fiber Bragg grating, the Bragg wavelength drifts with temperature about 10pm / °C. This coefficient mainly depends on the material of the fiber (silica), and it is usually difficult to change

Method used

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  • Temperature sensor based on cascaded π-phase-shifted fiber Bragg gratings
  • Temperature sensor based on cascaded π-phase-shifted fiber Bragg gratings
  • Temperature sensor based on cascaded π-phase-shifted fiber Bragg gratings

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Embodiment Construction

[0028] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0029] A high-sensitivity temperature sensor based on cascaded π-phase-shifted fiber Bragg gratings, such as figure 1 As shown, it includes a tunable laser (TLD) 1, an optical isolator 2, an optical circulator 3, a fiber Bragg grating temperature probe 4, a photodetector 5 and an oscilloscope 6.

[0030] Wherein said optical circulator 3 has three ports port1, port2, port3, and its function is that the light input from port port1 can only be output from port port2, the light input from port port2 can only be output from port port3, thus separates forward propagation The light field and the backpropagating light field. The fiber Bragg grating temperature probe 4 includes three parts, two identical π-phase-shifted fiber Bragg gratings 41, 43 and a fixed-length optical fiber 42 as a resonator, the polarization-maintaining fiber as an optical res...

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Abstract

The invention relates to a high-sensitivity temperature sensor with an all-fiber structure. The sensor uses two π-phase-shifted fiber Bragg gratings as optical reflection devices, and a fixed-length optical fiber as a resonant cavity to form a Fabry-Perot interferometer structure, which produces a narrow spectral line shape on the original π-phase-shifted fiber Bragg grating. The resonant peak of the line width improves the wavelength resolution, so that a higher temperature measurement sensitivity is obtained under the condition that the temperature response coefficient of the fiber Bragg grating is constant. The sensor can be cascaded to realize distributed temperature sensing.

Description

technical field [0001] The invention relates to a temperature sensor, in particular to a high-sensitivity temperature detector with an all-fiber structure. The temperature detector is based on a fiber Bragg grating-Fabry-Perot interferometer structure formed by cascaded π phase shift fiber bragg grating (π phase shift fiber bragg grating, PSFBG), which has an all-fiber structure, high sensitivity, and high reliability characteristics as well as enabling distributed temperature sensing. Background technique [0002] Fiber Bragg gratings reflect or transmit specific wavelengths (Bragg wavelengths) by producing periodic refractive index modulations in the fiber core. Fiber Bragg grating has the characteristics of all-fiber structure, easy integration, low insertion loss, high return loss, and flexible customization of spectral line shape, and is used in the fields of optical communication, fiber laser and optical sensor. In the field of optical sensors, fiber Bragg grating se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/32G01K11/3206
CPCG01K11/3206
Inventor 景明勇于波胡建勇张国峰肖连团贾锁堂
Owner SHANXI UNIV