Optical fiber strain sensor calibration device

Abstract

The utility model discloses an optical fiber strain sensor calibration device, which comprises a support unit and a calibration unit, the support unit comprises a first fixed support and a second fixed support, four corners of the first fixed support and four corners of the second fixed support are jointly fixed with a guide rod, and the calibration unit comprises a stop block. The four guide rods all penetrate through a stop block, the stop block is arranged on the guide rods in a sliding fit mode, an installation support is fixed to one guide rod, a dial indicator is installed at one end of the installation support, a deformation beam is fixed to the first fixed support and the stop block together, and a probe is installed on the dial indicator. According to the optical fiber strain sensor calibration device, high-precision displacement loading can be accurately controlled to be converted into strain loading measurement through the dial indicator, accurate calibration of the optical fiber strain sensor is achieved, the device is simple in structure and convenient to operate, different deformation beams are replaced by different optical fiber strain sensors for adaptation, and the calibration device has high adaptability.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of optical fiber sensing technology especially relates to a kind of optical fiber strain sensor calibration device. BACKGROUND

[0002] Optical fiber strain sensor is widely used in civil engineering, aerospace, ship and other fields due to its high sensitivity, anti-electromagnetic interference and corrosion resistance. However, the accuracy and reliability of optical fiber strain sensor depend on its calibration process. Traditional calibration method has low efficiency, easy to damage sensor and low calibration accuracy. Therefore, it is particularly important to develop a high-efficiency and accurate optical fiber strain sensor calibration device. SUMMARY

[0003] Therefore, the utility model aims at providing an optical fiber strain sensor calibration device, which solves the problems of low efficiency, easy to damage sensor and low calibration accuracy of traditional optical fiber strain sensor calibration method.

[0004] To achieve the above technical purpose, the utility model provides an optical fiber strain sensor calibration device:

[0005] It includes support unit and calibration unit, the support unit includes first fixed support and second fixed support, the four corners of the first fixed support and second fixed support are commonly fixed with guide rod, the calibration unit includes stopper, four guide rods are all through stopper, stopper is slidingly fitted on guide rod, one of guide rods is fixed with mounting support, one end of mounting support is provided with micrometer, first fixed support and stopper are commonly fixed with deformation beam, probe is installed on micrometer, one end of probe away from micrometer is connected with one end of deformation beam, deformation beam is provided with optical fiber strain sensor.

[0006] Preferably, a screw rod is threadedly connected to the middle of the second fixed support, the screw rod extends to the end outside the second fixed support and is fixed with a rocker, and the end of the screw rod away from the rocker is rotationally connected with the stopper.

[0007] Preferably, a first deformation groove and a second deformation groove are formed in the deformation beam, and the first deformation groove and the second deformation groove are respectively formed from the opposite sides of the deformation beam.

[0008] Preferably, a plurality of third deformation grooves are formed in the deformation beam at equal intervals, and the plurality of third deformation grooves are located between the first deformation groove and the second deformation groove.

[0009] Preferably, the top of the deformation beam is provided with two mounting blocks, the side close to each other of the two mounting blocks is fixed with a limiting rod, the fiber optic strain sensor is provided with a slot hole, and the limiting rod is slidingly fitted in the slot hole.

[0010] Preferably, the mounting block is provided with a mounting hole, a bolt is penetrated through the mounting hole, two screw holes are formed on the deformation beam, and the bolt and the screw hole are threadedly connected.

[0011] Preferably, when the bolt is penetrated through the mounting hole and threadedly connected with the screw hole, the two limiting rods are still spaced apart from each other at the end close to each other.

[0012] From the above technical solution, the present application has the following beneficial effects:

[0013] 1. The device can accurately control the high-precision displacement loading conversion into strain loading measurement through the micrometer, realizes accurate calibration of the fiber optic strain sensor, and has simple structure and convenient operation, and different fiber optic strain sensors replace different deformation beams to adapt, so that the calibration device has greater adaptability.

[0014] 2. By embedding the limiting rod into the slot hole, then mounting the mounting block and the fiber optic strain sensor on the deformation beam, when the deformation beam is stretched and contracted, the limiting rod will slide in the slot hole, and since the bolt and the screw hole are threadedly connected, the two limiting rods are still spaced apart from each other at the end close to each other, preventing the two limiting rods from being in contact, and the limiting rod embedded in the slot hole also constrains the fiber optic strain sensor, so that the fiber optic strain sensor can be mounted on the deformation beam, thereby facilitating the calibration of the fiber optic strain sensor. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0016] Figure 1 The structure diagram of the fiber optic strain sensor calibration device provided by the present application is shown in the figure.

[0017] Figure 2 The top view structure diagram of the fiber optic strain sensor calibration device provided by the present application is shown in the figure.

[0018] Figure 3 The top view structure diagram of the deformation beam provided by the present application is shown in the figure.

[0019] Figure 4The utility model provides a Figure 1 The enlarged schematic view of the middle A;

[0020] Figure 5 The utility model provides a Figure 2 The enlarged schematic view of the middle B.

[0021] The figure mark explanation: 100, support unit, 101, first fixed support, 102, second fixed support, 103, guide rod, 104, screw rod, 105, rocker, 200, calibration unit, 201, stop block, 202, mounting support, 203, micrometer, 204, deformation beam, 205, probe, 206, optical fiber strain sensor, 207, first deformation groove, 208, second deformation groove, 209, third deformation groove, 210, screw hole, 211, mounting block, 212, mounting hole, 213, bolt, 214, slot hole, 215, limiting rod. DETAILED DESCRIPTION

[0022] The following description is merely exemplary in nature and is not intended to limit the present disclosure, application and uses. It should be understood that throughout the drawings, the same or similar reference numerals can be used to depict the same or similar components as found throughout the specification and drawings. Each of the various drawings can schematically represent one or more of the embodiments of the present disclosure. The embodiments of the present disclosure are not necessarily drawn to scale in the drawings. Particular portions of certain drawings can be shown exaggerated in relation to other portions to illustrate aspects of the embodiments of the present disclosure.

[0023] Referring to Figures 1-5

[0024] For an embodiment of the utility model, provide a kind of optical fiber strain sensor calibration device, including support unit 100 and calibration unit 200, support unit 100 includes first fixed support 101 and second fixed support 102, first fixed support 101 and second fixed support 102 four corners are fixed with guide rod 103 in common, calibration unit 200 includes stop block 201, four guide rods 103 all are through stop block 201, stop block 201 is slidably fitted on guide rod 103, one of guide rod 103 is fixed with mounting support 202, mounting support 202 one end is equipped with micrometer 203, first fixed support 101 and stop block 201 are fixed with deformation beam 204 in common, micrometer 203 is equipped with probe 205, the end of probe 205 away from micrometer 203 and the end of deformation beam 204 are connected, and deformation beam 204 is provided with optical fiber strain sensor 206.

[0025] ​The second fixed support 102 is provided with a screw rod 104 in the middle, the screw rod 104 extends to the outside of the second fixed support 102, and one end of the screw rod 104 is fixed with a rocker 105, and the other end of the screw rod 104 is rotationally connected with the stop block 201.

[0026] In use, the rocker 105 is rotated to drive the screw rod 104 to rotate, and the screw rod 104 drives the stop block 201 to move forward and backward when rotating, at this time, the movement of the stop block 201 pushes the strain of the deformation beam 204 to produce a small displacement, and since the probe 205 is connected with one end of the deformation beam 204, the deformation amount of the deformation beam 204 can be accurately measured.

[0027] The subsequent calibration steps are as follows:

[0028] 1) Connect the optical fiber strain sensor 206 to the full spectrum analyzer, and read the center wavelength of the optical fiber strain sensor 206;

[0029] 2) The optical fiber strain sensor 206 to be calibrated is fixed on the deformation beam 204, and the deformation of the deformation beam 204 is transmitted to the optical fiber strain sensor 206;

[0030] 3) Through the strain calculation formula ε=△L / L, the strain amount transmitted by the calibration tool to the optical fiber strain sensor 206 can be obtained;

[0031] 4) Record the center wavelength readings under different strains, and use linear fitting calculation to complete the calibration of the sensor;

[0032] Wherein the formula ε=△L / L is used to describe the relative deformation degree of the material under the action of force, which is called relative deformation or linear strain, and △L represents the absolute deformation, i.e. the elongation or shortening amount of the deformation beam 204; L represents the original length of the deformation beam 204.

[0033] In addition, the deformation beam 204 is provided with a first deformation groove 207 and a second deformation groove 208, and the first deformation groove 207 and the second deformation groove 208 are respectively arranged from opposite sides of the deformation beam 204, and a plurality of third deformation grooves 209 are arranged at equal intervals in the deformation beam 204, and the plurality of third deformation grooves 209 are located between the first deformation groove 207 and the second deformation groove 208.

[0034] In addition, the top of the deformation beam 204 is provided with two mounting blocks 211, the side close to each other of the two mounting blocks 211 is fixed with a limiting rod 215, a slot hole 214 is formed in the fiber optic strain sensor 206, the limiting rod 215 is slidingly fitted in the slot hole 214, a mounting hole 212 is formed in the mounting block 211, a bolt 213 penetrates through the mounting hole 212, two screw holes 210 are formed on the deformation beam 204, the bolt 213 is threadedly connected with the screw hole 210, and the two ends of the two limiting rods 215 close to each other still have a spacing when the bolt 213 penetrates through the mounting hole 212 and is threadedly connected with the screw hole 210.

[0035] In use, when the fiber optic strain sensor 206 needs to be installed on the deformation beam 204, first, the limiting rod 215 is embedded in the slot hole 214, then the mounting block 211 and the fiber optic strain sensor 206 are placed on the deformation beam 204, the bolt 213 penetrates through the mounting hole 212, and the bolt 213 is threadedly connected with the screw hole 210 by rotating the bolt 213, so that the mounting block 211 is fixed with the deformation beam 204, when the deformation beam 204 is compressed, the first deformation groove 207, the second deformation groove 208 and the third deformation groove 209 belong to the deformable area, so that the deformation beam 204 can stretch and contract, and during the stretching and contracting of the deformation beam 204, the limiting rod 215 slides in the slot hole 214, because the two ends of the two limiting rods 215 close to each other still have a spacing when the bolt 213 is threadedly connected with the screw hole 210, the spacing provides space for the movement of the two limiting rods 215, preventing the two limiting rods 215 from interfering with each other, and the embedding of the limiting rod 215 in the slot hole 214 also constrains the fiber optic strain sensor 206, so that the fiber optic strain sensor 206 can be installed on the deformation beam 204.

[0036] The above describes the exemplary embodiments of the scheme proposed by the present disclosure in detail with reference to the preferred embodiments, however, those skilled in the art can understand that various modifications and improvements can be made to the above specific embodiments without departing from the concept of the present disclosure, and various technical features and structures proposed by the present disclosure can be combined without exceeding the protection scope of the present disclosure, and the protection scope of the present disclosure is determined by the appended claims.

Claims

1. An optical fiber strain sensor calibration device, characterized by, The utility model provides a kind of calibration device for optical fiber strain sensor, including: Support unit (100), which includes a first fixed support (101) and a second fixed support (102), and a guide rod (103) is fixed at the four corners of the first fixed support (101) and the second fixed support (102); The calibration unit (200) includes a stopper (201), four guide rods (103) pass through the stopper (201), the stopper (201) is slidingly fitted on the guide rod (103), one of the guide rods (103) is fixed with a mounting bracket (202), one end of the mounting bracket (202) is mounted with a micrometer (203), the first fixed support (101) and the stopper (201) are fixed with a deformation beam (204), the micrometer (203) is mounted with a probe (205), one end of the probe (205) away from the micrometer (203) is connected with one end of the deformation beam (204), and the deformation beam (204) is provided with an optical fiber strain sensor (206).

2. The fiber optic strain sensor calibration device of claim 1, wherein, The second fixed support (102) is threadedly connected with a screw rod (104) in the middle, the screw rod (104) extends to the outside of the second fixed support (102), one end of the screw rod (104) fixed with a rocker (105) away from the rocker (105), and the other end of the screw rod (104) away from the rocker (105) is rotatably connected with the stopper (201).

3. The fiber optic strain sensor calibration device of claim 1, wherein, The deformation beam (204) is provided with a first deformation groove (207) and a second deformation groove (208), and the first deformation groove (207) and the second deformation groove (208) are respectively formed from opposite sides of the deformation beam (204).

4. A fibre optic strain sensor calibration device according to claim 3, characterised in that, The deformation beam (204) is provided with a plurality of third deformation grooves (209) at equal intervals, and the plurality of third deformation grooves (209) are located between the first deformation groove (207) and the second deformation groove (208).

5. The fiber optic strain sensor calibration device of claim 1, wherein, The deformation beam (204) is provided with two mounting blocks (211) on the top, and the two mounting blocks (211) are fixed with a limiting rod (215) on the side close to each other, the optical fiber strain sensor (206) is provided with a slot (214), and the limiting rod (215) is slidingly fitted in the slot (214).

6. A fibre optic strain sensor calibration device according to claim 5, characterised in that, The mounting block (211) is provided with a mounting hole (212), and the mounting hole (212) is penetrated by a bolt (213), and the deformation beam (204) is provided with two screw holes (210), and the bolt (213) is threadedly connected with the screw hole (210).

7. A fibre optic strain sensor calibration device according to claim 6, characterised in that, When the bolt (213) penetrates the mounting hole (212) and is threadedly connected with the screw hole (210), the two limiting rods (215) are further spaced apart at the end close to each other.

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