CN202158841U

CN202158841U - Fiber bragg grating strain transducer

Info

Publication number: CN202158841U
Application number: CN2011202443078U
Authority: CN
Inventors: 白生宝; 肖迎春; 黄博; 李野; 贾淑红; 刘国强; 陈霞; 李明
Original assignee: AVIC Aircraft Strength Research Institute
Current assignee: AVIC Aircraft Strength Research Institute
Priority date: 2011-07-08
Filing date: 2011-07-08
Publication date: 2012-03-07
Anticipated expiration: 2021-07-08

Abstract

The utility model relates to a fiber bragg grating strain transducer. The fiber bragg grating strain transducer in the utility model includes a pedestal and a fiber bragg grating disposed on the pedestal. The pedestal is in a shell shape. A rectangular groove used for receiving the fiber bragg grating is arranged in the middle of the shell. Rectangular grooves used for snapping and fixing the fiber bragg grating are arranged in two ends of the shell. And the shell is provided with through holes communicating with the rectangular grooves. The rectangular groove in the middle of the shell is filled with binder. At the same time, a bonding area used for bonding with an object to be detected is arranged in an outer side of the shell. The fiber bragg grating strain transducer in the utility model can guarantee the accordance of the area and the thickness of the binder used in bonding. Since the change of the wavelength of the grating is influenced by the area and the thickness of the binder, the installation of the transducer becomes more convenient, the bonding procedures are simplified and the consistency of the sensitivity of the transducer is guaranteed.

Description

A kind of fiber Bragg grating strain sensor

Technical field

The utility model relates to fiber grating sensing technology, particularly relates to a kind of fiber-optic grating sensor that can be used for strain measurement.

Background technology

The principle of work of fiber Bragg grating strain sensor is to utilize the wavelength affected by force of grating and change; And wavelength variable quantity and linear this characteristic Design of strain; Can draw the strain variation amount of testee according to the variable quantity of sensor wavelength, strain can be normal strain and also can be negative strain.

Aspect the measurement strain, traditional sensor has: SMD resistance strain sensor, string type sensor etc., they in use are easy to receive such environmental effects such as electromagnetic interference (EMI), can't satisfy the following condition of using at complex environment.

Tradition is used fiber Bragg grating strain sensor; Be that bare optical fibers and bare optical gratings is directly sticked on the object under test surface; This fiber Bragg grating strain sensor can be realized the measurement of strain; But this sensor receives bonding agent bonding area and thickness easily and influences ga(u)ge factor, thereby influences the strain measurement data.

The fiber Bragg grating strain sensor of tradition use is CN201104221Y like Chinese utility model patent notification number in addition, and name is called a kind of fiber Bragg grating strain sensor; For realizing the measurement of normal strain and negative strain; And guarantee that wavelength does not drift about zero point after installation, regulate through threaded line pipe and nut apparatus, and this processing is in the measurement that has realized normal strain and negative strain; And when guaranteeing that after installation wavelength does not drift about zero point; Also object under test has been increased extra load, so this kind fiber Bragg grating strain sensor in the selection of testee, has certain limitation.

The utility model content

The purpose of the utility model: a kind of sensitivity coefficient high conformity, fiber Bragg grating strain sensor simple in structure, easy for installation are provided.

The utility model technical scheme: a kind of fiber Bragg grating strain sensor; It comprises substrate and places this suprabasil fiber grating that housing is processed in said substrate, the rectangular recess for being used to place fiber grating in the middle of the housing; Two ends are to be used to be fixed the rectangular recess of fiber grating; And housing is provided with the through hole that communicates with rectangular recess, and fills up cementing agent in the rectangular recess in the middle of the housing, and hull outside is provided with the adhesion zone that is used for the object under test bonding simultaneously.

Middle rectangular recess is narrower than two ends rectangular recess, and rectangular recess is darker than two ends rectangular recess in the middle of the housing.

Said housing rectangular recess top is shaped on 3 through holes, and wherein, interstitial hole is bigger than two side holes diameter.

The beneficial effect of the utility model is: both applicable to the strain of Measuring Object; And can carry out standard control to area and the thickness that alite paste is pasted, obtain conforming sensitivity coefficient, in light weight; Use simply, can use for a long time under the complex environment in electromagnetic interference (EMI).The utility model fiber Bragg grating strain sensor has stronger practical value in addition; Can be under the situation of last big a plurality of tested points of object Fast Installation; And can guarantee the consistance of installing, and if be used widely in the test field of fiber grating sensing technology, strain measurement and intensity research, effective accelerated test process; Improve the reliability and the validity of test figure, for the field based on strain measurement provides strong support.

Description of drawings

The structural representation of Fig. 1 the utility model figure fiber Bragg grating strain sensor;

Fig. 2 is the sectional view of Fig. 1;

Among the figure: 1-substrate, 2-fiber grating, 3-rectangular recess, 5-glued joint district, 6-inner chamber, the preceding hole of 7-, 8-interstitial hole, 9-metapore.

Embodiment

Through embodiment the utility model is done further to specify below:

Please consult Fig. 1 and Fig. 2 simultaneously, wherein, Fig. 1 is the structural representation of the utility model fiber Bragg grating strain sensor one preferred embodiments, and Fig. 2 is the sectional view of Fig. 1.In this embodiment; Said fiber Bragg grating strain sensor comprises substrate 1 and places this suprabasil fiber grating 2; Wherein substrate 1 is a housing, in the middle of the housing front rectangle inner chamber 6 is arranged, and there is rectangular recess 3 at two ends; Rectangular recess and two ends rectangular recess 3 are with wide in the middle of the housing, and rectangle inner chamber 6 is darker than two ends rectangular recess 3 in the middle of the housing.And be shaped on 3 through holes on the said housing, and being respectively preceding hole 7, interstitial hole 8, metapore 9, interstitial hole 8 is bigger with metapore 9 than preceding hole 7, both sides.Wherein, said fiber grating 2 two ends are fixed on the rectangular recess 3, and the adhesive securement in the pitamen intracoelomic cavity 6 is being treated on the geodesic structure.Overall optical fiber grating strain transducer shell is fixed on the object under test through the cementing agent that glueds joint district 5 simultaneously.

Can confirm the fiber Bragg grating strain sensor sensitivity coefficient according to the size of fiber grating type, adhesive type, rectangle inner chamber 6 and the two ends rectangular recess 3 used before the test.

Earlier fiber grating 2 is installed in the substrate 1 during test, through substrate 1 two ends rectangular recess 3 fiber grating 2 is clamped in the substrate 1, the available bonding agent in chucking back is reinforced once more, also can be without bonding agent.Glued joint district's 5 coated with adhesive or sticking double faced adhesive tape; Through this novel fiber grating strain transducer part fiber Bragg grating strain sensor is installed on the object under test; Then bonding agent is injected from interstitial hole 8; When bonding agent before the hole 7 with metapore 9 when overflowing, explain that bonding agent fills inner chamber in the substrate 1 completely for 6 sections.Because fiber grating 2 is right cylinders; Its with treat that geodesic structure is that line contacts; So when being full of bonding agent in the inner chamber 6, fiber grating 2 and treat that the space between the geodesic structure filled by bonding agent, fiber grating 2 with treat that geodesic structure becomes face through bonding agent and contacts; Fiber grating and object under test are well combined, so just can well reflect the logarithmic strain of object tested point.

After the fiber Bragg grating strain sensor installation, bonding agent is the length of inner chamber 6 to the stickup length of grating, and bonding agent thickness is the degree of depth of inner chamber 6, so the utility model can guarantee to paste with batch sensor the consistance of length and bonding agent thickness.The ga(u)ge factor of fiber-optic grating sensor receives the influence of bonding agent thickness and stickup length bigger; The utility model can carry out standard control to thickness and length that alite paste is pasted; Obtain conforming sensitivity coefficient; In light weight, use simply, thereby can use for a long time under the complex environment in electromagnetic interference (EMI).The utility model fiber Bragg grating strain sensor has stronger practical value in addition; Can be under the situation of the bigger a plurality of tested points of object Fast Installation; And can guarantee the consistance of installing, and if be used widely in the test field of fiber grating sensing technology, strain measurement and intensity research, effective accelerated test process; Improve the reliability and the validity of test figure, for the field based on strain measurement provides strong support.

Claims

1. fiber Bragg grating strain sensor; It comprises substrate and places this suprabasil fiber grating that it is characterized in that: housing is processed in said substrate, the rectangular recess for being used to place fiber grating in the middle of the housing; Two ends are to be used to be fixed the rectangular recess of fiber grating; And housing is provided with the through hole that communicates with rectangular recess, and fills up cementing agent in the rectangular recess in the middle of the housing, and hull outside is provided with the adhesion zone that is used for the object under test bonding simultaneously.

2. fiber Bragg grating strain sensor according to claim 1 is characterized in that: middle rectangular recess is narrower than two ends rectangular recess, and rectangular recess is darker than two ends rectangular recess in the middle of the housing.

3. fiber Bragg grating strain sensor according to claim 2 is characterized in that: said housing rectangular recess top is shaped on 3 through holes, and wherein, interstitial hole is bigger than two side holes diameter.