CN2705777Y

CN2705777Y - Slotted structure elastomer optical fiber rastor strain sensor head

Info

Publication number: CN2705777Y
Application number: CN 200420021044
Authority: CN
Inventors: 杨亦飞; 韦春龙; 曹春耕; 徐奎; 韦占雄
Original assignee: SHANGHAI SYNETOPTICS TECHNOLOGY CORP
Current assignee: SHANGHAI SYNETOPTICS TECHNOLOGY CORP
Priority date: 2004-03-18
Filing date: 2004-03-18
Publication date: 2005-06-22
Anticipated expiration: 2014-03-18

Abstract

Notching construction elastic body fiber grating strain sensor head belongs to ess-strain detection technique field, relates to a kind of fiber grating strain sensor header structure.This sensing head structure comprises: an elastic body, a through hole is arranged vertically, and from then on optical fiber pass in the hole, and at the two ends in hole optical fiber is fixed; Two dumbbell heads lay respectively at the elastic body two ends, and fastening with elastic body, are used to lead power; A protection tube is used for sealing and protection elastic body and fiber grating, and certain interval is arranged between protection tube and the dumbbell head in the axial direction, to allow elastic body certain reduction length is arranged.This structure, not only encapsulation is simple, and sensitivity is very high, and one-piece construction is simple, and cost is lower, is a kind of reliable and stable sensing head.

Description

Notching construction elastic body fiber grating strain sensor head

Technical field: the utility model belongs to ess-strain detection technique field, is a kind of ess-strain sensing head that is used for building, hydraulic engineering.

Background technology: fiber grating is very responsive to strain, temperature, pressure, is the performance of having used its strain sensitive here.When fiber grating generation strain, fiber grating pitch changes thereupon, by more this change, promptly can obtain dependent variable.

The fiber grating strain sensor head that uses has two kinds of versions now: the one, a fiber grating is bonded on the elastic substrates that approaches with glue or other material, again this substrate is fixed on the measured object with glue or alternate manner, makes the strain of measured object pass to fiber grating thus by two-layer glue and one deck base material.This version is simple, but owing to adopted glue packaged fiber grating in a large number, not only makes the sensitivity of grating be subjected to considerable influence, and the long-time stability of sensing head also are difficult to guarantee.The 2nd, fiber grating is passed the hollow tubular of a steel pipe or other material, and both are fixed together at two ends, make the grid region unsettled, the distortion by steel pipe or other hollow tubular drives the fiber grating distortion.This packaged type advantage is to make the grid region unsettled, giving full play to the sensitive performance of fiber grating, but because the rigidity of used steel pipe or other hollow tubular is too big, is difficult to realize the Compression and Expansion distortion, so in fact its sensitivity is still very low.

Summary of the invention: the utility model is to provide a kind of fiber grating use highly sensitive, and a kind of notching construction elastic body fiber grating strain sensor head of energy stable for extended periods of time.

The technical solution of the utility model is:

The rectangular parallelepiped manganese steel that two is threaded socket cap, along the central shaft both sides, the groove N that passes a center that has paired symmetry to the axle center is right, constitute elastic body, elastomeric central shaft is to a through hole is arranged, wire fiber grating from then on hole passes, and is fixed on the end points of two dumbbell heads again after passing from the dumbbell head of band center pit; The threaded circular column cap at manganese steel two is screwed in the internal thread groove of two dumbbell heads; The outer wall of dumbbell head is by in the inwall that is inserted in protection tube, between the two by the O-ring seal liner.

N is to getting 1～6 pair, and fiber grating and dumbbell head are fixing can to stick with glue knot, or welding, but also beading.Being split into groove can be the paired groove of density interphase, perhaps the equally distributed paired groove of density.Certain interval is arranged between protection tube and the dumbbell head in the axial direction.

After implementing the utility model, for society provides a kind of simple and reliable fiber package structure, not only encapsulation is simple, and sensitivity is very high; One-piece construction is simple, and cost is lower; In optical fiber grating sensing is used, a breakthrough technology has been proposed.

Description of drawings:

Fig. 1 is the utility model structural representation;

Fig. 2 is the equally distributed a kind of form of fluting elastic body;

Fig. 3 is a kind of form of fluting elastic body density interphase;

Fig. 4 is the equally distributed another kind of form of fluting elastic body;

Fig. 5 is the another kind of form of fluting elastic body density interphase.

Embodiment: existing the utility model is described in further detail in conjunction with the accompanying drawings:

As shown in Figure 1, the rectangular parallelepiped manganese steel that two is threaded socket cap, along the central shaft both sides, the groove N that passes a center that has paired symmetry to the axle center is right, constitutes elastic body 1; Elastomeric central shaft is to there being a through hole, and wire fiber grating 5 from then on hole passes, and is fixed on the end points of two dumbbell heads 3 again after passing from the dumbbell head of band center pit; The threaded circular column cap at manganese steel two is screwed in the internal thread groove of two dumbbell heads, and the outer wall of dumbbell head is by in the inwall that is inserted in protection tube 2, between the two by O-ring seal 4 liners.

N is to getting 1～6 pair, and fiber grating and dumbbell head are fixed, and can stick with glue knot, or welding, but also beading.Being split into groove can be the paired groove of density interphase, and as Fig. 3, shown in Figure 5, the perhaps equally distributed paired groove of density is as Fig. 2, shown in Figure 4.Certain interval is arranged between protection tube and the dumbbell head in the axial direction.

Claims

1, a kind of notching construction elastic body fiber grating strain sensor head, by the wire fiber grating, elastic body, dumbbell head, protection tube is formed, and it is characterized in that:

The rectangular parallelepiped manganese steel that two is threaded socket cap, along the central shaft both sides, the groove N that passes a center that has paired symmetry to the axle center is right, constitutes elastic body (1); Elastomeric central shaft is to there being a through hole, and wire fiber grating (5) from then on passes in the hole, is fixed on the end points of two dumbbell heads (3) again after passing from the dumbbell head of band center pit; The threaded circular column cap at manganese steel two is screwed in the internal thread groove of two dumbbell heads (3), and the outer wall of dumbbell head is by in the inwall that is inserted in protection tube (2), between the two by O-ring seal (4) liner.

2, sensing head according to claim 1 is characterized in that: described N is to being N=1,2,3,4,5,6.

3, sensing head according to claim 1 is characterized in that: described fiber grating is fixed on the end points of two dumbbell heads, can be to stick with glue knot, welding, beading.

4, sensing head according to claim 1 is characterized in that: describedly having a paired groove, can be the paired groove of density interphase, perhaps the equally distributed paired groove of density.

5, sensing head according to claim 1 is characterized in that: the outer wall of described dumbbell head is that certain interval is arranged between protection tube and the dumbbell head in the axial direction by in the inwall that is inserted in protection tube.