CN211504028U - Fiber grating displacement sensor - Google Patents
Fiber grating displacement sensor Download PDFInfo
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- CN211504028U CN211504028U CN202020654960.0U CN202020654960U CN211504028U CN 211504028 U CN211504028 U CN 211504028U CN 202020654960 U CN202020654960 U CN 202020654960U CN 211504028 U CN211504028 U CN 211504028U
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Abstract
The utility model provides a fiber grating displacement sensor, including the casing, set up the coaxial reel in the casing, coaxial reel is at least including two rim plates of coaxial different wheel footpaths that set up, and two rim plates link through same pivot, are used for the winding to connect the first stay cord that detects the object in two rim plates on the big rim plate, are used for the winding to connect stress fiber grating's second stay cord on the little rim plate in two rim plates. The utility model discloses a set up the coaxial reel including coaxial two rim plates of setting up different wheel footpaths, can convert the displacement volume of awaiting measuring great into the micro variable volume of stress fiber grating detection end, big rim plate and small rim plate are fixed to be set up in same pivot, and the number of turns of rotation of big rim plate and small rim plate equals, and the radius is different, and the girth is different for the length of big rim plate and the winding stay cord of small rim plate is different, and this embodiment has just realized the micromation of a wide range displacement through simple device structure. A large range of displacement measurements is achieved.
Description
Technical Field
The utility model relates to a photoelectron measuring device correlation technique field, specific theory relates to a fiber grating displacement sensor.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The grating fiber has the advantages of small volume, low fusion loss, full compatibility with the fiber, embedding of intelligent materials and the like, and the resonance wavelength of the grating fiber is sensitive to the changes of external environments such as temperature, strain, refractive index, concentration and the like, so the grating fiber is widely applied to the fields of manufacturing fiber lasers, fiber communication and sensing, and the grating fiber is widely applied at present. The inventor finds that, in the displacement measurement field, the current detection method based on the fiber grating displacement sensor has a small measurement range, which is about several meters, and for large-range measurement, such as measurement of tens of meters or even hundreds of meters, because of the limitation of the internal structure and volume of the fiber grating displacement sensor, the technical problem is encountered during large-range expansion, such as patent application No. 201410209172.X, the patent name is a fiber grating displacement sensor and a measurement method, if the measurement range is increased, the manufacturing difficulty and the sensor volume are greatly increased, and the long-term stable measurement of the sensor is not facilitated.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve above-mentioned problem, provided a fiber grating displacement sensor, through adopting the coaxial reel in different reel footpaths, increase the displacement measurement distance to tens meters's the order of magnitude. The method can be applied to real-time online monitoring of large-range displacement such as landslide, soft soil foundation settlement, structural health and the like.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a fiber grating displacement sensor, includes the casing, sets up the coaxial reel in the casing, coaxial reel includes two rim plates of coaxial setting different wheel footpaths at least, and two rim plates link through same pivot, and first stay cord is connected to big rim plate in two rim plates, and the second stay cord is connected to the steamboat in two rim plates, and the second stay cord is connected with stress fiber grating.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses a set up the coaxial reel including coaxial two rim plates of setting up different wheel footpaths, can convert the displacement volume of awaiting measuring great into the micro variable volume of stress fiber grating detection end, big rim plate and small rim plate are fixed to be set up in same pivot, and the number of turns of rotation of big rim plate and small rim plate equals, and the radius is different, and the girth is different for the length of big rim plate and the winding stay cord of small rim plate is different, and this embodiment has just realized the micromation of a wide range displacement through simple device structure. A large range of displacement measurements is achieved.
Advantages of additional aspects of the invention will be set forth in the detailed description which follows, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which form a part of the specification, are provided to provide a further understanding of the invention, and are included to explain the illustrative embodiments and the description of the invention, and not to constitute a limitation of the invention.
Fig. 1 is a cross-sectional view in a front view of a sensor of embodiment 1 of the present disclosure;
FIG. 2 is a top view of a sensor of embodiment 1 of the present disclosure;
fig. 3 is an external view of a sensor of embodiment 1 of the present disclosure;
FIG. 4 is a schematic structural diagram of a small wheel disc according to embodiment 1 of the present disclosure;
wherein: 1. the cable fixing device comprises a coaxial reel, 1-1 parts of a groove, 2 parts of a second pull rope, 3 parts of a tension spring, 4 parts of a stress ring, 5 parts of a first fixing screw, 6 parts of a gasket, 7 parts of a stress fiber grating, 8 parts of a temperature compensation grating, 9 parts of an optical fiber, 10 parts of an optical cable joint, 11 parts of an optical cable, 12 parts of a limiting block, 13 parts of a fixing pull ring, 14 parts of the first pull rope, 15 parts of the second fixing screw, 16 parts of a fixing piece, 18 parts of a shell, 19 parts of a third fixing screw, 20 parts of a fixing terminal, 21 parts of a fourth fixing screw.
The specific implementation mode is as follows:
the present invention will be further explained with reference to the accompanying drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the technical solution disclosed in one or more embodiments, as shown in fig. 1 and 2, a fiber grating displacement sensor comprises a housing 18 and a coaxial reel 1 arranged in the housing 18, wherein the coaxial reel 1 at least comprises two discs coaxially arranged with different wheel diameters, the two discs are linked through the same rotating shaft, a first pull rope 14 used for winding and connecting a detection object is arranged on a large disc in the two discs, and a second pull rope 2 used for winding and connecting a stress fiber grating 7 is arranged on a small disc in the two discs.
This embodiment can convert the great displacement volume that awaits measuring into the micro variable of stress fiber grating 7 sense terminal through setting up coaxial reel 1 including coaxial two rim plates that set up different wheel footpaths, has realized the displacement measurement of wide range.
Optionally, the coaxial reel 1 includes a large reel, a small reel, and a rotating shaft fixedly connected to the large reel and the small reel, the large reel and the small reel are fixedly disposed on the same rotating shaft, and the rotating shaft is fixedly disposed in the housing 18 through the bearing connection fixing member 16. Big rim plate and the fixed setting of miniwheel dish are in same pivot, and the number of turns of rotation of big rim plate and miniwheel dish equals that the radius is different, and the girth is different for the length of big rim plate and the winding stay cord of miniwheel dish is different, and this embodiment has just realized the micromation of wide range displacement through simple device structure.
Alternatively, the fixing member 16 may be configured as a support rod, a support plate or a support shaft, and the fixing member 16 is fixedly connected to the rotating shaft and the housing 18, respectively, and may be fixed to the housing by a third fixing screw 19. The fixing member 16 of the sensor provided in this embodiment may be formed by pressing a stainless steel sheet having a length of 20cm, a width of 1.5cm and a thickness of 0.5mm, and has a diameter of 10mm for fixing the rotation axis and a hole diameter of 2mm for fixing the fixing member to the housing 18.
In some embodiments, the first cord 14 is wound in a direction opposite to the second cord 2 such that when the two pulleys rotate, the first cord 14 and the second cord 2 are wound in one side and wound out the other side.
Optionally, the second pull rope 2 and the first pull rope 14 are both steel wire ropes, the steel wire ropes have high tensile strength, fatigue resistance and impact toughness, the thin steel wire ropes can also achieve high tensile strength, and the thin steel wire ropes can be set to be thin steel wire ropes, so that measurement errors of displacement are reduced. The thickness of millimeter level can be adopted, the influence of piling up of winding number of turns stay cord to the displacement of measurement is avoided.
The reel 1 used in this embodiment may have a radius ratio of 150, for example, a small reel radius of 1mm, a large reel radius of 150mm, and a slot 1-1 in the middle of the small reel for holding the thin wire, as shown in fig. 4, which is an enlarged detail view. The second pull rope 2 can adopt a thin steel wire with the diameter of 0.2mm, the length can be 20cm, the first pull rope 14 can adopt a steel wire rope with the diameter of 0.5mm, the length can be 30 m, and the overall size of the sensor can be 44cm long, 33cm wide and 8cm high. Therefore, the sensor device of the embodiment has the advantages of small volume, portability and contribution to popularization and use.
In some embodiments, the second pulling rope 2 is connected with the stress fiber grating 7 through the stress ring 4, the stress fiber grating 7 is adhered on the stress ring 4, and the deformation direction of the stress fiber grating 7 is consistent with the stress direction of the stress ring 4. The use of the stress ring 4 can convert the tension to be measured into micro-strain suitable for fiber grating measurement.
The deformation direction of the stress fiber grating 7 is consistent with the stress direction of the stress ring, so that the fiber grating can better capture the strain amount generated by the stress ring 4.
Optionally, the stress ring 4 is connected to the second pull rope 2 through an extension spring 3. Extension spring 3 is used for turning into the displacement volume tensile, provides wire rope's resilience force through using extension spring, when realizing a wide range measurement, has realized retrenching of wire rope resilience structure, and extension spring converts the displacement volume of awaiting measuring after will scaling down into the pulling force to the stress ring simultaneously.
The tension spring 3 of this embodiment may be selected from a 304 stainless steel tension spring having a wire diameter of 1.2, an outer diameter of 22mm and a length of 450 mm.
The stress ring 4 is mainly used for converting the tensile force of the spring into the stress acting on the stress fiber grating 7, and when the tensile force of the extension spring 3 acting on the stress ring 4 changes, the stress applied to the stress fiber grating 7 adhered on the stress ring 4 also changes; the parameters of the stress ring 7 are selected to ensure that the tensile force of the tension spring 3 cannot cause the stress fiber grating on the stress ring to break, i.e. the strain amount of the stress ring 7 does not exceed the detection range of the stress fiber grating.
The two sides of the stress ring 4 can be provided with fixing holes which are respectively used for fixing the stress ring 4 on the shell 18 and connecting the extension spring 3, and the round mouth of the stress ring 4 is required to be vertically downward when the stress ring 4 is installed, so that the stress ring 4 is prevented from generating deformation due to self gravity. The material of the stress ring 4 of the embodiment can be spring steel, and the size can be selected from the inner diameter of 20mm, the outer diameter of 23mm and the height of 15 mm; a small hole of approximately 2mm in diameter may be provided on each side of the stress ring.
As a further improvement, a temperature compensation grating 8 can be further included, and the temperature compensation grating 8 and the stress fiber grating 7 are connected with the same optical fiber 9 and arranged in the shell 18 at a position close to the stress fiber grating 7. The temperature compensation grating 8 and the stress fiber grating 7 can adopt Corning single mode fiber, and the model can be G.652D.
The temperature compensation grating 8 is used for carrying out temperature compensation treatment on the stress fiber grating 7 to ensure that the wavelength drift amount of the stress fiber grating is only influenced by the stress action; the temperature compensation grating 8 is always in a state of not being stressed and only influenced by temperature change.
Optionally, a gasket 6 may be further disposed between the fixing points of the stress ring 4 and the housing 18, and the gasket 6 serves to increase the distance between the stress ring and the housing and to reserve a space for the stress fiber grating attached to the stress ring; this embodiment may use a shim with a thickness of 15 mm.
Optionally, the stress ring 4 and the housing 18 may be fixedly connected in a variety of connection manners, and may be in threaded connection, and the first fixing screw 5 is provided to fix the stress ring 4 on the housing, so that the stress ring does not move along with the extension of the extension spring; the first fixing screw 5 of the present embodiment may be a screw with a diameter of 2mm and a length of 20 mm.
As a connecting structure, an optical cable joint 10 is arranged on a shell 18, the optical cable joint 10 is connected with an optical cable 11, the optical cable is connected with an optical fiber 9, and the optical cable 11 is mainly used for protecting the optical fiber and realizing the long-distance transmission of optical signals; the optical cable joint is used for connecting the optical cable and the sensor housing, and a waterproof flange joint can be adopted in the embodiment. The sensor is connected to the data acquisition equipment and the light source through optical fibers, so that the transmission of the sensing data of the sensor is realized.
The wire outlet position of the first pull rope 14 is provided with a limiting block 12, and the size of the limiting block is at least larger than that of the wire outlet hole. For restricting the first pulling rope 14 from being completely retracted; the limiting block 12 is disposed at a wire outlet of the first pulling rope 14 on the housing 18, or the limiting block 12 may be fixed at a position on the first pulling rope 14 close to the end of the first pulling rope. When the measurement calibration is performed, the variation is measured with the position of the stopper 14 as the displacement starting point.
In order to conveniently fix a measured object or a point to be measured, a fixing device, which can be a fixing pull ring 13, can be arranged at the tail end of the first pull rope 14, and the fixing pull ring 13 is mainly used for connecting a steel wire rope with the point to be measured; the pull ring 13 of the present embodiment may be made of stainless steel.
Optionally, the structure of the casing 18 may be a totally enclosed structure, the totally enclosed structure may realize protection of the internal sensor, the totally enclosed structure may adopt a structure of an upper casing and a lower casing, and the upper casing and the lower casing are fixedly connected through a fourth fixing screw 21.
Alternatively, as shown in fig. 3, a fixed terminal 20 may be disposed outside the housing, and the sensor of the present embodiment is fixedly disposed at the position of the measurement point through the fixed terminal 20.
According to the device, a large displacement is converted into a micro-variable displacement through the coaxial reel 1 through the displacement to be measured, the micro-variable displacement is converted into stress through the tension spring 3, the stress is acted on the stress fiber grating 7 through the stress ring 4, the stress fiber grating 7 receives the change of the stress, the wavelength of the stress is shifted, the size of the stress can be obtained according to the wavelength shift and the wavelength shift generated by temperature, and the displacement to be measured can be calculated and obtained according to the size of the stress based on the structure of the device. The device structure based on this embodiment carries out displacement detection, and measuring device is simple, and it is convenient to set up, can set for the proportion of big small wheel dish to change the range, and it is accurate to measure, simultaneously greatly reduced the measuring degree of difficulty.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Although the present invention has been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without inventive work are still within the scope of the present invention.
Claims (10)
1. A fiber grating displacement sensor is characterized in that: including the casing, set up the coaxial reel in the casing, coaxial reel is at least including two rim plates of coaxial different wheel footpaths that set up, and two rim plates link through same pivot, and first stay cord is connected to big rim plate in two rim plates, and the second stay cord is connected to the steamboat in two rim plates, and the second stay cord is connected with stress fiber grating.
2. The fiber grating displacement sensor according to claim 1, wherein: the coaxial reel comprises a large wheel disc, a small wheel disc and a rotating shaft fixedly connected with the large wheel disc and the small wheel disc, and the rotating shaft is fixedly arranged in the shell through a bearing connecting fixing piece.
3. The fiber grating displacement sensor according to claim 2, wherein: the fixing piece is a support rod, a support plate or a support shaft, and the fixing piece is respectively and fixedly connected with the rotating shaft and the shell.
4. The fiber grating displacement sensor according to claim 1, wherein: the winding direction of the first pull rope is opposite to that of the second pull rope, so that the first pull rope and the second pull rope can be wound on one side and unwound on the other side when the two wheel discs rotate.
5. The fiber grating displacement sensor according to claim 1, wherein: the second pull rope and the first pull rope are both steel wire ropes.
6. The fiber grating displacement sensor according to claim 1, wherein: the second pull rope is connected with the stress fiber grating through the stress ring, the stress fiber grating is adhered to the stress ring, and the deformation direction of the stress fiber grating is consistent with the stress direction of the stress ring.
7. The fiber grating displacement sensor according to claim 6, wherein: the stress ring is connected with the second pull rope through a tension spring.
8. The fiber grating displacement sensor according to claim 6, wherein: fixing holes are formed in two sides of the stress ring and are respectively used for fixing the stress ring on the shell and connecting the stress ring with the extension spring, and the stress ring is arranged in the shell with a circular opening vertically downward;
or
And a gasket is arranged between the stress ring and the fixed point of the shell.
9. The fiber grating displacement sensor according to claim 1, wherein: a limiting block is arranged at the wire outlet of the first pull rope, and the size of the limiting block is at least larger than that of the wire outlet hole; or a limiting block is arranged at the wire outlet of the first pull rope on the shell; or the limiting block is fixed on the first pull rope at a position close to the tail end of the first pull rope.
10. The fiber grating displacement sensor according to claim 1, wherein: the temperature compensation grating is connected with the stress fiber grating through the same optical fiber, and the temperature compensation grating is arranged in the shell and close to the stress fiber grating.
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| CN202020654960.0U CN211504028U (en) | 2020-04-24 | 2020-04-24 | Fiber grating displacement sensor |
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| CN202020654960.0U CN211504028U (en) | 2020-04-24 | 2020-04-24 | Fiber grating displacement sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111473733A (en) * | 2020-04-24 | 2020-07-31 | 珠海任驰光电科技有限公司 | Ultra-large range fiber grating displacement sensor and measuring method |
| CN112286236A (en) * | 2020-11-02 | 2021-01-29 | 浙江中控太阳能技术有限公司 | Heliostat azimuth angle control device and method |
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2020
- 2020-04-24 CN CN202020654960.0U patent/CN211504028U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111473733A (en) * | 2020-04-24 | 2020-07-31 | 珠海任驰光电科技有限公司 | Ultra-large range fiber grating displacement sensor and measuring method |
| CN112286236A (en) * | 2020-11-02 | 2021-01-29 | 浙江中控太阳能技术有限公司 | Heliostat azimuth angle control device and method |
| CN112286236B (en) * | 2020-11-02 | 2023-03-31 | 浙江可胜技术股份有限公司 | Heliostat azimuth angle control device and method |
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