Temperature sensor of long period optical fiber grating

A long-period grating and optical fiber grating technology, which is applied in the field of temperature sensing devices and long-period optical fiber grating temperature sensing devices, can solve the problems of low modulation degree and low temperature sensitivity, and achieve good stability, high temperature sensitivity, The effect of simple structure

Inactive Publication Date: 2007-10-03
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI +1
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Problems solved by technology

But it has a lower degree of modulation, i.e. less temperature sensitivity

Method used

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  • Temperature sensor of long period optical fiber grating
  • Temperature sensor of long period optical fiber grating
  • Temperature sensor of long period optical fiber grating

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Embodiment Construction

[0019] An embodiment of the present invention is shown in FIG. 1 . As can be seen from the figure, the temperature sensing device of the long-period fiber grating of the present invention is composed of: on the single-mode fiber cladding 2 written with the long-period grating, one side of the fiber grating is plated from the inside to the outside along the axial direction. There are low thermal expansion coefficient coating layer 8 and high thermal expansion coefficient coating layer 3 . The period 4 of the long-period grating is 500-900 μm, the cladding diameter after etching is 65-85 μm, and the total length 6 of the grating is 40-60 mm. The central angle corresponding to the low thermal expansion coefficient coating layer 8 and the high thermal expansion coefficient coating layer 3 is 60-120°, and the thickness of the low thermal expansion coefficient coating layer is 20-30 μm. The long-period fiber grating can be realized by photolithography and etching, and the coating l...

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Abstract

A temperature sensing device of long period optical fiber raster belongs to fiber optic communications and fiber optic transduction field, formed by writing long period raster on cladding through corrosion then plate low heat-sensitive material and high heat-sensitive material on one side of optical fiber. When environmental temperature changes, expanding with heat and contracting with cold of film layer plated makes raster bend so that synchronous resonant wave length of long period optical fiber raster changes. The invention has properties of high temperature sensibility,, simple structure, good stability, resistance of high temperature, can be used in high temperature measurement and multi-point type temperature measurement.

Description

technical field [0001] The invention relates to a temperature sensing device, in particular to a temperature sensing device of a long-period optical fiber grating, which belongs to the field of optical fiber communication and optical fiber sensing. Background technique [0002] The grating period of the long-period fiber grating (LPFG) is much larger than that of ordinary fiber gratings, usually tens of microns to hundreds of microns. From the theory of mode coupling, the long-period grating realizes the coupling between the same-direction modes of the fiber, that is, the coupling between the guided mode and the cladding mode. The transmission characteristics of LPFG will change due to the influence of external temperature, stress, bending, etc. When the external factors change, the changes of the transmission constants of the guided mode and the cladding mode corresponding to a certain frequency are different. However, when the external temperature is high, the grating wr...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/32G01D5/353G01K11/3206
Inventor 何慧灵瞿荣辉阮昊
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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