CN2627479Y

CN2627479Y - Distributed optical fibre grating packaging temperature sensor

Info

Publication number: CN2627479Y
Application number: CN 03260021
Authority: CN
Inventors: 周智; 欧进萍
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-05-30
Filing date: 2003-05-30
Publication date: 2004-07-21
Anticipated expiration: 2013-05-30

Abstract

The utility model relates to a distributed-type optical-fiber grating packaged temperature sensor which comprises a bare optical fiber grating, a package tube arranged outside the optical fiber grating, and adhesive stoppers arranged at two ends of the package tube. Two ends of the optical fiber grating extend out of the adhesive stoppers. Based on the properties of heat conduction and high strength of metal materials and distributed sensing property of optical fiber grating, the utility model has advantages of compact structure, small size, easy installation, distributed sensation, good endurance, adhesive or embedded configuration, low cost, and convenient fabrication.

Description

The distributed fiber grating encapsulation temperature sensor

(1), affiliated field

The utility model relates to a kind of intellectual monitoring sensor.Specifically a kind of distributed fiber grating encapsulated sensor that is used for temperature monitoring.

(2), background technology

Traditional temperature sensor can not satisfy good stability, good endurance simultaneously, both can the surface paste also can imbed, requirement such as distributed on-line data acquisition.Fiber grating is a kind of temperature-sensing element of function admirable, no matter at technology maturity, or has all obtained the breakthrough of essence on the cost.The major advantage that fiber grating is used for temperature sensing is embodied in: be not subjected to the interference of electromagnetic field, electrical insulating property is good; Good endurance; Light weight, volume be little, little to structure influence, be easy to arrange; Both point measurement can be realized, also distributed measurement can be realized; Absolute measurement; Save circuit, only just can the transfer structure status signal with single line; But signal, data multipath transmission are convenient to be connected with computing machine; Signal attenuation is little on the unit length; Highly sensitive, the precision height; Bandwidth, signal to noise ratio (S/N ratio) is high.Temperature monitoring must guarantee that temperature sensor fully contacts measurand, will guarantee also that simultaneously the sensing characteristics of temperature sensor is not restricted by the thermal expansion or the stress field of measurand, otherwise temperature sensor can't correctly react the temperature information of measurand.The fiber-optic grating sensor of report is surface or the test environment that directly fiber grating is placed measurand at present, and mostly be single-spot testing, the distributed sensing advantage that makes full use of fiber grating useless, often be the temperature expansion and the influence of stress place of structure objects, test result is difficult to guarantee, have rapid wear, test shortcomings such as unreliable, do not see report at present at the fiber grating temperature sensor encapsulation.Consider that bare optical fibers and bare optical gratings is very thin especially, directly it can't be competent at sensor as temperature sensor and lay and abominable Service Environment.Therefore, bare optical fibers and bare optical gratings being carried out encapsulation process, is the inevitable link that fiber grating is applied as temperature sensor.

(3), summary of the invention

The purpose of this utility model be to provide a kind of simple in structure, lay convenient, precision is high, good endurance, both can lay the measurand surface, but also laying structure inside, adapt to the distributed fiber grating encapsulation temperature sensor that extensive style is laid.

The purpose of this utility model is achieved in that it comprises bare optical fibers and bare optical gratings, is surrounded by package tube outside fiber grating, and the two ends of package tube are provided with the tackifier end socket, and the tackifier end socket is stretched out at the two ends of fiber grating.The utility model can also comprise some architectural features like this: 1, the outer setting at the package tube two ends has the thin-wall metal ring, is filled with structure glue in the thin-wall metal ring; 2, in package tube, be filled with heat-conduction liquid; 3, at least one end of fiber grating has one section unsettled optical fiber; 4, the two ends external belt matcoveredn of fiber grating; 5, the two ends of fiber grating are connected with transmission cable.

The utility model is a kind of distributed fiber grating encapsulation temperature sensor that keeps original fiber grating temperature sensor characteristic.Fiber grating is encapsulated in the package tube that heat-conduction liquid mercury is housed by tackifier is unsettled, reaches the purpose that keeps fiber grating intrinsic temperature sensing characteristics.Package tube plays the function of protection grating and transmission heat, and it has more consistent thermal expansivity with tested structure objects, in case sensor thermal expansion fatigure failure.Heat-conduction liquid mercury plays the purpose of quick balanced structure and optical fiber grating temperature.Two ends are connected with transmission cable, are convenient to the distributed polyphone of a plurality of sensors, realize distributed measurement, reduce transmission line.Consider the needs that the laying of sensor extensive style, protection against the tide and monitoring of structures internal temperature change simultaneously, two of sensor can adopt thin-wall metal ring and structure glue to fix.The utility model has made full use of the distributed sensing characteristic of thermal conduction characteristic and the high-strength characteristic and the fiber grating of metal material, have compact conformation, volume is little, laying is convenient, distributed sensing, good endurance, be that Pasting also can be imbedded structure, advantage such as with low cost, easy to make.

(4), description of drawings

Accompanying drawing is a structural representation of the present utility model.

(5), specific embodiments

For example the utility model is done description in more detail below in conjunction with accompanying drawing:

The composition of distributed fiber grating encapsulation temperature sensor comprises bare optical fibers and bare optical gratings 5, is surrounded by package tube 4 outside fiber grating, and the two ends of package tube are provided with tackifier end socket 2, and the tackifier end socket is stretched out at the two ends of fiber grating.In package tube, be filled with heat-conduction liquid 8.Package tube wherein can be metal tube or glass tube; Heat-conduction liquid can be selected mercury for use.

Second kind of embodiment of the present utility model is on the basis of embodiment one, and the outer setting at the package tube two ends has thin-wall metal ring 7, is filled with structure glue 1 in the thin-wall metal ring.Can play better reinforcing and waterproof action like this.

The third embodiment of the present utility model is on embodiment one or two basis, at an end of fiber grating one section unsettled optical fiber 9 is set.The two ends external belt matcoveredn 6 of fiber grating.Can guarantee that like this capillary metal tube can freely stretch.

The 4th kind of embodiment of utility model is that the two ends of fiber grating are connected with transmission cable 3 on embodiment one, two or three basis.Be convenient to the distributed polyphone of a plurality of sensors, realize distributed measurement, reduce transmission line.

Claims

1, a kind of distributed fiber grating encapsulation temperature sensor, it comprises bare optical fibers and bare optical gratings, it is characterized in that: be surrounded by package tube outside fiber grating, the two ends of package tube are provided with the tackifier end socket, and the tackifier end socket is stretched out at the two ends of fiber grating.

2, distributed fiber grating encapsulation temperature sensor according to claim 1, it is characterized in that: the outer setting at the package tube two ends has the thin-wall metal ring, is filled with structure glue in the thin-wall metal ring.

3, distributed fiber grating encapsulation temperature sensor according to claim 1 and 2 is characterized in that: be filled with heat-conduction liquid in package tube.

4, distributed fiber grating encapsulation temperature sensor according to claim 1 and 2 is characterized in that: at least one end of fiber grating has one section unsettled optical fiber.

5, distributed fiber grating encapsulation temperature sensor according to claim 3 is characterized in that: at least one end of fiber grating has one section unsettled optical fiber.

6, distributed fiber grating encapsulation temperature sensor according to claim 1 and 2, it is characterized in that: the two ends of fiber grating are connected with transmission cable.

7, distributed fiber grating encapsulation temperature sensor according to claim 3, it is characterized in that: the two ends of fiber grating are connected with transmission cable.

8, distributed fiber grating encapsulation temperature sensor according to claim 4, it is characterized in that: the two ends of fiber grating are connected with transmission cable.

9, distributed fiber grating encapsulation temperature sensor according to claim 5, it is characterized in that: the two ends of fiber grating are connected with transmission cable.