CN202869692U

CN202869692U - Minitype quartz FBG temperature-sensitive sensor

Info

Publication number: CN202869692U
Application number: CN201220439778.9U
Authority: CN
Inventors: 张橙; 印新达; 董雷; 甘太国; 常晓东
Original assignee: Wuhan Ligong Guangke Co Ltd
Current assignee: Wuhan Ligong Guangke Co Ltd
Priority date: 2012-08-31
Filing date: 2012-08-31
Publication date: 2013-04-10
Anticipated expiration: 2022-08-31

Abstract

The utility model discloses a minitype quartz FBG temperature-sensitive sensor, comprising a heat conduction pipe, an optical-fiber grating, a quartz groove, two rubber gaskets and two tail sleeves, wherein the optical-fiber grating is an optical-fiber Bragg grating. A middle part of the optical-fiber grating is packaged in the quartz groove and is in a bending state. Thermal expansion coefficient of the quartz groove is the same to that of the optical-fiber grating. The quartz groove is mounted in the heat conduction pipe and is directly contacted with the heat conduction pipe. The two rubber gaskets are disposed in the heat conduction pipe and are respectively arranged on two ends of the quartz groove. The tail sleeves are mounted outside of the rubber gaskets. Two ends of the optical-fiber grating pass through the rubber gaskets and the tail sleeves. Sealant is filled on two ends of the heat conduction pipe. The quartz groove is packaged in the heat conduction pipe and one end of the tail sleeve is fixed in the heat conduction pipe. The FBG temperature-sensitive sensor provided by the utility model can avoid interference of thermal expansion stress and has a good heat conduction performance. The sensor has huge raise about reliability of cold resistance and waterproof and moistureproof performances, and is minimized. A use field scope of the sensor is greatly enlarged.

Description

Miniature quartz FBG temperature sensing sensor

Technical field

The utility model relates to fiber grating sensing technology, relates in particular to a kind of miniature quartz FBG temperature sensing sensor.

Background technology

Since the people such as Morey of the U.S. in 1989 carry out the strain and temperature sensor research of fiber grating first, countries in the world are all extremely paid close attention to it and have been carried out widely applied research, in more than the 10 year short time fiber grating oneself become sensory field technology with fastest developing speed, and obtained successful application in a lot of fields, such as Aero-Space, civil engineering work, compound substance, field of petrochemical industry.

Fiber grating is to utilize the photosensitivity in the optical fiber to make.When the photosensitivity in the so-called optical fiber referred to that laser passes through doped fiber, the refractive index of optical fiber will be with the characteristic of the space distribution generation respective change of light intensity.And the space phase grating that in fibre core, forms, the essence of its effect is exactly (transmission or reflection) wave filter or the catoptron that forms an arrowband in fibre core.Utilize this characteristic can produce the optical fibre device of many unique properties.

Temperature is directly to affect the factor that optic fiber grating wavelength changes; people usually directly directly use bare optical fibers and bare optical gratings as temperature sensor; but people wish that again fiber grating can have stronger physical strength and long life-span; meanwhile; also wish to improve the response sensitivity of fiber grating pair temperature; therefore fiber-optical grating temperature sensor also needs to encapsulate, and the Main Function of encapsulation technology is protection and enhanced sensitivity.

Present Package technique for fiber gratings mainly contains two kinds of natural torsion and stress, the former main monitor temperature, and the latter is used for the fields such as stress, displacement.If but the natural torsion bending amplitude is excessive, then encapsulation is difficult to reach the microminiaturization of sensor, if the independent monitor temperature of the encapsulation of stress is subject to again the interference of other package material and structure easily.

The utility model content

The technical problems to be solved in the utility model be in the prior art to the encapsulation of fiber grating, the defective that is difficult to reach miniaturization or is subject to easily the interference of package material and structure, provide a kind of and can realize microencapsulated and not disturbed by other factors, do not affect the miniature quartz FBG temperature sensing sensor of linearity and the repeated feature of fiber grating itself.

The technical scheme that its technical matters that solves the utility model adopts is:

A kind of miniature quartz FBG temperature sensing sensor is provided, comprise heat pipe, fiber grating, quartz cell, rubber blanket and tail sleeve pipe, fiber grating is Fiber Bragg Grating FBG, the center section of fiber grating is encapsulated in the quartz cell, and be case of bending, the thermal expansivity of quartz cell is identical with fiber grating, quartz cell is encapsulated in the heat pipe, quartz cell places in the heat pipe and directly is in contact with it, and is provided with two rubber blankets in the heat pipe, places respectively the two ends of quartz cell, be equipped with the tail sleeve pipe in the rubber blanket outside, rubber blanket and tail sleeve pipe are all passed in the two ends of fiber grating, and fill with at the heat pipe two ends fluid sealant, and an end of tail sleeve pipe is fixed in the heat pipe.

In the miniature quartz FBG temperature sensing sensor described in the utility model, the center section of fiber grating crooked maximum sagitta in quartz cell is no more than 1mm.

In the miniature quartz FBG temperature sensing sensor described in the utility model, the center section of fiber grating is encapsulated in the quartz cell by adhesive.

In the described miniature quartz FBG of the utility model temperature sensing sensor, heat pipe is metal tube.

Use the utility model, have following beneficial effect: the thermal expansivity of quartz cell is identical with fiber grating in the utility model, can get rid of because the thermal expansion stress that the package material difference causes disturbs; Directly contact between heat pipe and the quartz cell, improved greatly heat conductivility; The rubber blanket that the quartz cell two ends arrange can prevent that fluid sealant from entering in the encapsulation cavity of fiber grating.Miniature quartz FBG temperature sensing sensor of the present utility model is greatly improved in the reliability such as cold-resistant and waterproof and dampproof, and has carried out downsizing, greatly expanded it and used territory, and on the linearity of FBG sensor itself and repeatability without affecting.

Description of drawings

The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:

Fig. 1 is the structural representation of the utility model embodiment miniature quartz FBG temperature sensing sensor.

Among the figure:

1 quartz cell, 2 fiber gratings

3 adhesives, 4 heat pipes

5 fluid sealants, 6 tail sleeve pipes

7 rubber blankets

Embodiment

In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.

In preferred embodiment of the present utility model, miniature quartz FBG temperature sensing sensor comprises heat pipe 4, fiber grating 2, quartz cell 1, rubber blanket 7 and tail sleeve pipe 6, fiber grating 2 is Fiber Bragg Grating FBG (FBG:Fiber Bragg Grating), the center section of fiber grating 2 is encapsulated in the quartz cell 1, and be case of bending (microbend), the thermal expansivity of quartz cell 1 is identical with fiber grating 2, can get rid of because the thermal expansion stress that the package material difference causes disturbs; Quartz cell 1 places in the heat pipe 4 and directly is in contact with it, and directly contacts between heat pipe 4 and the quartz cell 1, has improved greatly heat conductivility; Heat pipe 4 is metal tube among the embodiment of the present utility model, can be stainless-steel tube.

Be provided with two rubber blankets 7 in the heat pipe 4, place respectively the two ends of quartz cell 1.Be equipped with tail sleeve pipe 6 in rubber blanket 7 outsides, rubber blanket 7 and tail sleeve pipe 6 are all passed in the two ends of fiber grating 2, and fill with at heat pipe 4 two ends fluid sealant 5, quartz cell 1 is encapsulated in the heat pipe 4, and an end of tail sleeve pipe 6 is fixed in the heat pipe 4.Arranging of rubber blanket 7 can prevent that fluid sealant from entering in the encapsulation cavity of fiber grating 2.

Among the utility model embodiment, fiber grating 2 is the microbend state and is encapsulated in the quartz cell 1, and the center section of fiber grating 2 crooked maximum sagitta in quartz cell is no more than 1mm.

When encapsulation, the center section of fiber grating 2 can be encapsulated in the quartz cell by adhesive 3, this adhesive 3 can be the UV adhesive.

The package dimension of miniature quartz FBG temperature sensing sensor of the present utility model is less, only is Φ 3mm*30mm.

The encapsulation process of the utility model miniature quartz FBG temperature sensing sensor is:

With fiber grating 2 little curved being encapsulated in the quartz cell 1,3 pairs of fiber gratings 2 of available UV adhesive are adhesively fixed, then carry out outer package with heat pipe 4, penetrate at last the two ends tail optical fiber of fiber grating 2 with rubber blanket 7 and tail sleeve pipe 6, carry out encapsulating with 5 pairs of heat pipe 4 two ends of fluid sealant at last, thereby finish the sealing of whole sensor.

The encapsulating structure of miniature quartz FBG temperature sensing sensor of the present utility model, be greatly improved in the reliability such as cold-resistant and waterproof and dampproof, and carried out downsizing, and linearity and the repeatability nothing of FBG sensor itself affected, greatly expanded the territory of its use.

Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection domain of the utility model claims.

Claims

1. miniature quartz FBG temperature sensing sensor, it is characterized in that, comprise heat pipe, fiber grating, quartz cell, rubber blanket and tail sleeve pipe, fiber grating is Fiber Bragg Grating FBG, the center section of fiber grating is encapsulated in the quartz cell, and be case of bending, the thermal expansivity of quartz cell is identical with fiber grating, quartz cell places in the heat pipe and directly is in contact with it, be provided with two rubber blankets in the heat pipe, place respectively the two ends of quartz cell, be equipped with the tail sleeve pipe in the rubber blanket outside, rubber blanket and tail sleeve pipe are all passed in the two ends of fiber grating, and fill with at the heat pipe two ends fluid sealant, quartz cell is encapsulated in the heat pipe, and an end of tail sleeve pipe is fixed in the heat pipe.

2. miniature quartz FBG temperature sensing sensor according to claim 1 is characterized in that, the center section of fiber grating crooked maximum sagitta in quartz cell is no more than 1mm.

3. miniature quartz FBG temperature sensing sensor according to claim 1 is characterized in that the center section of fiber grating is encapsulated in the quartz cell by adhesive.

4. miniature quartz FBG temperature sensing sensor according to claim 1 is characterized in that, heat pipe is metal tube.