CN217980220U

CN217980220U - Plastic optical fiber grating strain gauge

Info

Publication number: CN217980220U
Application number: CN202222200822.7U
Authority: CN
Inventors: 朱佳佳; 谢国坚; 陈建辉
Original assignee: Shenzhen Zhongke Sensing Technology Co ltd
Current assignee: Shenzhen Zhongke Sensing Technology Co ltd
Priority date: 2022-08-19
Filing date: 2022-08-19
Publication date: 2022-12-06
Anticipated expiration: 2032-08-19

Abstract

The utility model discloses a plastics fiber grating strainometer, include: optical fiber, plastic mount pad and two plastic strain pieces. The middle part of the optical fiber is arranged on the plastic mounting seat, and the two ends of the plastic mounting seat are fixed with the optical fiber. The two plastic strain pieces are respectively arranged between the two ends of the optical fiber and the plastic mounting seat, and the two ends of the plastic strain pieces are fixed with the optical fiber. The optical fibers arranged on the plastic mounting seat and the plastic strain piece are respectively carved with Bragg gratings. And signal connectors connected with an external demodulator are arranged at two ends of the optical fiber. The utility model has the advantages that: the plastic mounting seat and the two plastic strain pieces are linearly bonded on the surface of the measured object along the line, the elastic modulus of the plastic material is small, the follow-up property with the measured structure is good, the interference to the original stress field in the measurement is small, and the measurement precision is higher. The optical fiber is not easy to damage, the volume is small, the structure is simple, the service life is longer, the optical fiber can be bonded with various types of substrates and used in different environments, and the optical fiber can be recycled and reused.

Description

Plastic optical fiber grating strain gauge

Technical Field

The utility model relates to a technical field of strainometer, in particular to plastics fiber grating strainometer.

Background

The fiber grating strain gauge is fixed on the surface of an object to be measured, and when the object is stressed to deform, the strain area of the fiber grating strain gauge is driven to deform together, so that the central wavelength of the optical fiber is changed, and an external demodulation instrument measures the deformation quantity according to the measured central wavelength. The existing fiber grating strain gauge is packaged by a metal mounting seat, the elastic modulus of metal is large, the interference to an original stress field is large in measurement, only one strain area is provided, and the measurement precision is low. In addition, the optical fiber is easy to be damaged by collision when the metal material is packaged.

SUMMERY OF THE UTILITY MODEL

To the problem that prior art exists, the utility model provides a plastics fiber grating strainometer.

In order to achieve the above object, the utility model provides a plastic fiber grating strainometer, include: optical fiber, plastic mount pad and two plastic strain pieces. The middle part of the optical fiber is arranged on the plastic mounting seat, and the two ends of the plastic mounting seat are fixed with the optical fiber. The two plastic strain pieces are respectively arranged between the two ends of the optical fiber and the plastic mounting seat, and the two ends of the plastic strain pieces are fixed with the optical fiber. The optical fibers arranged on the plastic mounting seat and the plastic strain piece are respectively carved with Bragg gratings. And signal connectors are arranged at two ends of the optical fiber and connected with an external demodulator.

Preferably, the upper end face of the plastic mount is provided with a groove along its own length, the optical fiber being disposed in the groove.

Preferably, both ends of the plastic mounting seat are provided with fixing parts, and the fixing parts are fixedly connected with the optical fibers.

Preferably, the optical fiber passes through the plastic strain member along a length direction of the plastic strain member.

Preferably, the bottom end face of the plastic strain gauge is planar.

Preferably, the signal connector is an LC/APC jumper connector.

Compared with the prior art, the beneficial effects of the utility model reside in that: by adopting the plastic mounting seat and the plastic strain piece to fix the optical fiber and the plastic mounting seat and the two plastic strain pieces are linearly bonded on the surface of the measured object along the line, the elastic modulus of the plastic material is small, the follow-up property with the measured structure is good, the interference to the original stress field in the measurement is small, three strain areas are provided, and the measurement precision is higher. In addition, the optical fiber is packaged by adopting a plastic material, so that the optical fiber is not easy to damage, the size is small, the structure is simple, the service life is longer, the optical fiber can be bonded with various types of substrates and used in different environments, and the optical fiber is suitable for being arranged on the surface of a hydraulic structure or other structures for health monitoring for a long time and can be recycled.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is an overall structure diagram of an embodiment of the present invention;

fig. 2 is a side view of the plastic strain gauge assembled with the optical fiber according to an embodiment of the present invention;

the purpose of the present invention is to provide a novel and improved method and apparatus for operating a computer.

Detailed Description

The utility model provides a plastics fiber grating strainometer.

Referring to fig. 1-2, fig. 1 is an overall structure diagram of an embodiment of the present invention, and fig. 2 is a side structure diagram of an embodiment of the present invention after assembling a plastic strain gauge and an optical fiber.

As shown in fig. 1-2, in an embodiment of the present invention, the plastic fiber grating strain gauge includes: optical fiber 1, plastic mount 2 and two plastic strain pieces 3. The upper end face of the plastic mounting seat 2 is provided with a groove 4 along the length of the upper end face, the middle part of the optical fiber 1 is arranged in the groove 4 on the plastic mounting seat 2, the optical fiber 1 is prevented from being exposed and easily damaged, and Bragg gratings are carved on the optical fiber in the groove 4 on the plastic mounting seat 2. Both ends of plastic mounting seat 2 all are equipped with fixed part 5, and fixed part 5 bonds or glass welded fastening with optic fibre 1, conveniently fixes optic fibre 1. When the device is used, the plastic mounting base 2 is bonded on the surface of a measured object, when the plastic mounting base 2 deforms along with the measured object, the Bragg grating on the optical fiber 1 in the groove 4 deforms in a displacement mode, and the central wavelength reflected by the Bragg grating is changed. Two plastic strain parts 3 are respectively arranged between two ends of the optical fiber 1 and the plastic mounting seat 2, and the optical fiber 1 penetrates through the plastic strain parts 3 along the length direction of the plastic strain parts 3, so that the optical fiber 1 is internally arranged in the plastic strain parts 3, and the optical fiber 1 is prevented from being exposed and easily damaged. The fiber inside the plastic strain part 3 is also engraved with Bragg grating, the two ends of the plastic strain part 3 are bonded with the fiber 1 or fixed by glass welding, when in use, the two plastic strain parts 3 and the plastic mounting seat 2 are linearly arranged and bonded on the surface of a measured object, when the plastic strain part 3 deforms along with the measured object, the Bragg grating on the fiber 1 inside the plastic strain part 3 also displaces and deforms accordingly, and the central wavelength reflected by the Bragg grating is changed. The bottom end face of the plastic strain element 3 is a plane 7 so as to ensure the bonding area of the plastic strain element 3 and the surface of the object to be measured and ensure the bonding strength. The two ends of the optical fiber 1 are provided with signal connectors 6, the signal connectors 6 are LC/APC jumper connectors, the signal connectors 6 are connected with an external demodulator, and the wavelength change signals of the optical fiber 1 are transmitted to the demodulator through the signal connectors 6 for demodulation, so that the deformation quantity of the optical fiber 1, namely the deformation quantity of a measured object, is measured.

Compared with the prior art, the beneficial effects of the utility model reside in that: through adopting plastics mount pad 2 and plastics foil gage 3 fixed optical fiber 1 to plastics mount pad 2 and two along plastics foil gage 3 linear bonding on the surface of measured object, the plastics material elastic modulus is little, and is good with the follow-up nature of measured structure thing, and is little to the interference of original stress field in the measurement, has three strain area, and measurement accuracy is higher. In addition, the optical fiber 1 is packaged by adopting a plastic material, the size is small, the structure is simple, the service life is longer, the optical fiber can be bonded with various types of substrates and used in different environments, and the optical fiber is suitable for being arranged on the surface of a hydraulic structure or other structures for health monitoring for a long time and can be recycled.

The above only be the preferred embodiment of the utility model discloses a not consequently restriction the patent scope of the utility model, all be in the utility model discloses a under the design, utilize the equivalent structure transform of what the content of the description and the attached drawing was done, or direct/indirect application all includes in other relevant technical field the utility model discloses a patent protection is within range.

Claims

1. A plastic fiber grating strain gauge, comprising: the optical fiber, the plastic mounting seat and the two plastic strain pieces; the middle part of the optical fiber is arranged on the plastic mounting seat, and two ends of the plastic mounting seat are fixed with the optical fiber; the two plastic strain pieces are respectively arranged between the two ends of the optical fiber and the plastic mounting seat, and the two ends of the plastic strain pieces are fixed with the optical fiber; the optical fibers arranged on the plastic mounting seat and the plastic strain piece are respectively engraved with Bragg gratings; and signal connectors are arranged at two ends of the optical fiber and connected with an external demodulator.

2. A plastic fiber grating strain gauge according to claim 1 wherein the upper end face of the plastic mount has a groove along its length in which the optical fiber is disposed.

3. The plastic fiber grating strain gauge according to claim 2, wherein the plastic mount has fixing portions at both ends thereof, and the fixing portions are fixedly connected to the optical fiber.

4. The plastic fiber grating strain gauge of claim 1 wherein the optical fiber passes through the plastic strain member along a length of the plastic strain member.

5. The plastic fiber grating strain gauge of claim 4 wherein the bottom end face of the plastic strain element is planar.

6. The plastic fiber grating strain gauge of claim 1, wherein the signal connector is an LC/APC jumper connector.