Distributed liquid temperature sensor based on fiber bragg grating

A fiber grating, liquid temperature technology, applied to thermometers, thermometers, instruments and other directions with physical/chemical changes, can solve the problems of complex operation, difficult implementation, can not completely isolate the grating force, etc., to achieve simple measurement structure, long-term good stability

CN110954242AInactive Publication Date: 2020-04-03WUHAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-04-03
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a distributed liquid temperature sensor based on a fiber bragg grating. The sensor comprises a temperature measurement fiber grating, a stainless steel capillary tube, a substrate and a heat shrink tube, optical fiber jumper, the fiber bragg grating passes through the bent capillary tube after the coating layer is removed; the axis of the capillary steel pipe is not parallel; two ends of the stainless steel capillary tube respectively fix the optical fiber in the central area of the substrate through adhesives, the optical fiber area covered by the adhesives is not provided with a coating layer, and through the above packaging, the fiber bragg grating is ensured to resist external tension and optical fiber elongation caused by thermal expansion and cold contractionof the capillary tube, and the influence of thermal stress is isolated. The distributed liquid temperature sensor based on the fiber bragg grating has the advantages of being simple in structure, firmin installation and convenient to assemble and disassemble. The device has the characteristics of wide measurement range, high measurement precision and distributed measurement in function; and electromagnetic interference resistance and chemical corrosion resistance can be realized.
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Description

technical field

[0001] The invention belongs to the technical field of temperature detection, and in particular relates to a distributed liquid temperature sensor based on an optical fiber grating. Background technique

[0002] Temperature is a physical quantity that characterizes the degree of coldness or heat of an object. It is one of the seven basic physical quantities in the International System of Units. It is closely related to human life, industrial and agricultural production, and scientific research. At present, the main temperature instruments, such as thermocouples, thermal resistance and radiation thermometers, have matured in technology, but they can only be used in traditional occasions and cannot meet the requirements of many fields. Fiber Bragg Grating (FBG) sensing technology developed in recent years is an advanced sensing technology, which realizes large-capacity and distributed dynamic detection of various physical quantities through the wavelength modul...

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Embodiment Construction

[0021] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0022] In the embodiment of the present invention, such as figure 1 , 2 As shown in , 3, a distributed liquid temperature sensor based on optical fiber gratings is provided, including outer protective shells 10, 11, external hooks 9, temperature measuring optical fiber gratings 1, stainless steel capillary tubes 8, substrate 4, and corrosion-resistant heat shrinkable tubes 5 , Fiber jumper 6. The temperature-measuring fiber grating 1 passes through the curved stainless steel capillary 8 and is not parallel to the axis of the capillary tube. The temperature-measuring fiber grating 1 is respectivel...