Bimetal sheet type optical fiber microbending temperature sensor

A temperature sensor, bimetal technology, applied in thermometers, using optical devices to transmit sensing components, thermometers based on material expansion/contraction, etc., can solve the problems of low sensitivity, poor stability, large volume, etc., and achieve reliability. Good, change the bending loss, the effect of high precision

Inactive Publication Date: 2008-07-09
深圳市雨新电线电缆有限公司
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Problems solved by technology

Because two sets of lenses are used to focus the output light of the optical fiber on the grating disk to form two light spots, the disadvantages are large volume, difficult debugging and poor stability.
[0008] Chinese patent application 200310111511.2 discloses a "microbent optical fiber temperature sensor". When the temperatu

Method used

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  • Bimetal sheet type optical fiber microbending temperature sensor

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Embodiment Construction

[0019] Please refer to Fig. 1, the present invention provides a kind of bimetallic microbending optical fiber temperature sensor 1, and it comprises the optical fiber microbending deformer 12 that is made of two deformation teeth that are arranged oppositely by two pieces, one is clamped in this optical fiber microbending deformation The signal optical fiber 13 in the middle of the device 12, and a bimetallic sheet 11 composed of two layers of metals (or alloys) with different thermal expansion coefficients, the bimetallic sheet 11 is in contact with the optical fiber microbending deformer 12.

[0020] The bimetal strip 11 is used as a temperature measuring element, which includes two layers of metals or alloys with different thermal expansion coefficients.

[0021] When the temperature changes, the bimetal 11 senses the temperature change, and pushes the optical fiber micro-bend deformer 12 to generate displacement, changing the bending degree of the signal optical fiber 13 , ...

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Abstract

The invention provides a bimetallic strip type microbend optical fiber temperature sensor, which comprises a microbend optical fiber deforming device, a signal optical fiber imbedded in the microbend optical fiber deforming device and a bimetallic strip, wherein the bimetallic strip contacts with the microbend optical fiber deforming device. The bimetallic strip in the inventive bimetallic strip type microbend optical fiber temperature sensor can generate displacement according to the temperature variation, so as to generate deflection variation which acts on the microbend optical fiber deforming device to make the deforming device generate displacement, so as to change the bending loss of optical fiber. In this way, the temperature signal is converted to optical signal, which can be transmitted by the optical fiber to realize long-distance measurement with high precision and good reliability.

Description

technical field [0001] The invention relates to a temperature sensor, in particular to a bimetal type optical fiber microbending sensor utilizing the temperature characteristics of a bimetallic strip and the microbending loss of an optical fiber. Background technique [0002] Traditional temperature measuring sensors, such as thermistors and thermocouples, will be greatly affected by strong electric and magnetic fields, and it is not suitable for long-distance measurement, which will cause large deviations, which is not conducive to use in explosion-proof occasions . The fiber optic temperature sensor has many advantages and has attracted people's attention. For example, the fiber grating temperature sensor has been studied more, but the cost of fiber grating demodulation is relatively high, and its application is limited. [0003] The fiber optic microbending sensor was first proposed by J.N.Fields and J.H.Cole in 1980, and belongs to the light intensity modulation fiber ...

Claims

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Application Information

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IPC IPC(8): G01K5/62G01L1/24G01D5/26
Inventor 李学金
Owner 深圳市雨新电线电缆有限公司
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