CN108759701B - Surface-mounted sensor with optical fiber vibrating wire combination and adjustable initial value - Google Patents
Surface-mounted sensor with optical fiber vibrating wire combination and adjustable initial value Download PDFInfo
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- CN108759701B CN108759701B CN201810411783.0A CN201810411783A CN108759701B CN 108759701 B CN108759701 B CN 108759701B CN 201810411783 A CN201810411783 A CN 201810411783A CN 108759701 B CN108759701 B CN 108759701B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/165—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by means of a grating deformed by the object
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
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Abstract
The invention discloses a surface-mounted sensor with an optical fiber vibrating wire combination and an adjustable initial value, which comprises: an outer sleeve; a pair of mounting brackets; the left sleeve and the right sleeve are fixed with the elastic element; the small sleeve is arranged in the elastic element, one end of the small sleeve penetrates through the first preformed hole and is welded with the first preformed hole, and the other end of the small sleeve penetrates through the opening and is not in contact with the small sleeve; the vibrating wire penetrates through the small sleeve, two ends of the vibrating wire are clamped by the clamping pieces, and the clamping pieces are respectively inserted into the left sensor end and the right sensor end; the magnetic induction ring is fixed on the small sleeve, a signal of the magnetic induction ring is output from the cable, and the cable penetrates through the elastic element and is positioned on the outer side of the outer sleeve; the strain grating is pasted on the inner side surface of the elastic element, and the temperature compensation grating is pasted on the outer surface of the small sleeve. The invention can accurately measure concrete structures with low elastic modulus, steel structures and other low elastic modulus structures.
Description
Technical Field
The invention relates to the field of measuring devices. More particularly, the present invention relates to a surface-mounted transducer with an adjustable initial value for a combination of fiber vibration and wire.
Background
At present, surface-mounted sensors for measuring structural strain are various in form, common surface-mounted sensors are resistance type sensors, vibrating wire type sensors and fiber grating type sensors, performances are based on respective principles and have advantages and disadvantages, wherein the vibrating wire type sensors are easy to measure, low in cost and difficult to damage in severe environments, the grating type sensors are good in dynamic performance, accurate in measurement, small in creep deformation and long in fatigue life, and therefore if advantages of various aspects can be integrated, the invention provides a combined type sensor which has practical significance for making good use of advantages and avoiding disadvantages.
The invention discloses a novel mounting mode, which aims to accurately measure a surface-mounted sensor with a long gauge length and realize high efficiency of strain transfer.
For a long-gauge-length surface-mounted grating sensor, an elastic body and a bonding mode are one of key factors determining the performance of the grating sensor, and at present, a common elastic body is in a zigzag shape, but the requirement on processing precision is high, and the processing is inconvenient.
Therefore, the research on the surface-mounted sensor with the adjustable optical fiber vibrating wire combination and the initial value has practical significance.
Disclosure of Invention
The invention aims to provide a surface-mounted sensor with an adjustable initial value for an optical fiber vibrating wire combination, which can accurately measure concrete structures with low elastic modulus, steel structures and other low elastic modulus structures.
To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a fiber optic vibrating wire combination and initial value tunable surface mount sensor comprising:
the outer sleeve is composed of a left sleeve and a right sleeve, and the left end of the left sleeve and the right end of the right sleeve are respectively plugged by a left sensor end and a right sensor end;
the pair of mounting supports are respectively positioned at two ends of the outer sleeve and are respectively fixed with the left sensor end and the right sensor end;
the elastic element is of a hollow cylindrical structure, a first preformed hole is formed in one side, facing the left sleeve, of the elastic element, an opening is formed in one side, facing the right sleeve, of the elastic element, and the left sleeve and the right sleeve are both fixed with the elastic element;
the small sleeve is arranged in the elastic element, one end of the small sleeve penetrates through the first preformed hole and is welded with the first preformed hole, the other end of the small sleeve penetrates through the opening, and the opening is not contacted with the small sleeve;
the vibrating wire penetrates through the small sleeve, two ends of the vibrating wire are clamped by the clamping pieces, and the clamping pieces are respectively inserted into the left sensor end and the right sensor end;
the magnetic induction ring is wrapped and fixed on the small sleeve through an epoxy resin layer and does not cover two ends of the small sleeve, a signal of the magnetic induction ring is output from a cable, and the cable penetrates out of the elastic element and is positioned on the outer side of the outer sleeve;
the strain grating is pasted on the inner side surface of the elastic element, the temperature compensation grating is pasted on the outer surface of the small sleeve, and the tail fibers of the strain grating and the temperature compensation grating penetrate out of the elastic element and are located on the outer side of the outer sleeve.
Preferably, the mounting bracket comprises a base and a pair of ear plates; the pair of ear plates are arranged on the base at intervals along the axial direction of the outer sleeve, U-shaped bayonets are formed in the ear plates, and screw holes are formed in the two sides of the bayonets;
the left sensor end and the right sensor end penetrate through the middle part of the mounting support and extend towards the outer periphery to form fixing pieces;
and fastening bolts penetrate into the screw holes to fix the left sensor end head and the right sensor end head from two sides.
Preferably, the strain grating and the temperature compensation grating have their pigtails threaded into the cable and threaded out of the resilient element together.
Preferably, the elastic element is made of alloy steel, and the wall thickness of the elastic element is 0.5 mm.
Preferably, the sealing device further comprises a cover which covers the outer part of the elastic element to seal the elastic element from the outer part.
Preferably, the diameter of the outer sleeve is 7-9mm, and the diameter of the small sleeve is 2-3 mm.
The invention at least comprises the following beneficial effects:
1. the optical fiber type and vibrating wire type sensors are combined, the advantages of the optical fiber type and vibrating wire type sensors can be integrated, data can be compared with each other during measurement, the vibrating wire type sensors are fully exerted, the measurement is easy, the cost is low, the vibrating wire type sensors are not prone to damage under severe environment, the dynamic performance of the grating type sensors is good, the measurement is accurate, the creep deformation is small, and the fatigue resistance and the service life are long.
2. The traditional idea of transferring strain through friction force is abandoned, and strain is horizontally transferred by using a thin screw rod, so that the strain transfer loss is small.
3. The initial frequency of the vibrating wire and the initial wavelength of the grating can be flexibly and freely adjusted, and the strain test range is enlarged.
4. The elastic body is a thin-wall circular ring, the elasticity is high, the whole surface of the grating is adhered to the inner surface of the circular ring, and batch fine machining is easy to realize.
5. The cascade grating temperature self-compensation technology is adopted, one end of the inner sleeve is completely free, is not influenced by stress change and is only influenced by temperature, the temperature compensation can be completely realized, and the structure and the process are simple, and the cost is low.
In addition, the sensor has the characteristics of convenience in installation, simplicity and rapidness in disassembly and repeated turnover use, and can meet the requirements of measurement of steel structures and concrete structures and other low-elastic-modulus structures.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a front view of a fiber optic vibrating wire combination and initial value tunable surface mount sensor according to one embodiment of the present invention;
FIG. 2 is a top view of a fiber optic vibrating wire combination and initial value tunable surface mount sensor according to one embodiment of the present invention;
FIG. 3 is a schematic view of a mounting bracket;
FIG. 4 is a schematic view of an ear plate;
FIG. 5 shows strain loss measurements using the fiber-optic vibrating wire combination of example 1 of the present application with tunable initial values for surface-mounted transducers and commercially available vibrating wire transducers;
fig. 6 is a schematic of the sensor of comparative example 1.
Description of reference numerals: 1-mounting a support, 2-fixing part, 3-clamping part, 4-vibrating wire, 5-outer sleeve, 6-small sleeve, 7-first bolt, 8-sealing cover, 9-elastic element, 10-strain grating, 11-temperature compensation grating, 12-magnetic induction ring, 13-cable, 14-fastening bolt, 111-tail fiber, 201-left sensor end and 202-right sensor end.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
In the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1 to 4, the surface-mounted sensor with an adjustable initial value for optical fiber vibrating wire combination includes:
the outer sleeve 5 is composed of a left sleeve and a right sleeve, and the left end of the left sleeve and the right end of the right sleeve are respectively plugged by a left sensor end 201 and a right sensor end 202; the left sensor head 201 and the right sensor head 202 are fixed to the outer sleeve 5 by laser welding.
A pair of mounting supports 1 respectively located at two ends of the outer sleeve 5 and respectively fixed with the left sensor end 201 and the right sensor end 202;
the elastic element 9 is of a hollow cylindrical structure, a first preformed hole is formed in one side, facing the left sleeve, of the elastic element 9, an opening is formed in one side, facing the right sleeve, of the elastic element, and the left sleeve and the right sleeve are fixed with the elastic element 9 in a laser welding mode;
the small sleeve 6 is arranged in the elastic element 9, one end of the small sleeve 6 penetrates through the first reserved hole and is welded with the first reserved hole, the other end of the small sleeve 6 penetrates through the opening, and the opening is not in contact with the small sleeve 6; one end of the small sleeve 6 is completely free and is not influenced by stress change, so that the small sleeve is only influenced by temperature, temperature compensation is realized through the temperature compensation grating 11, and the small sleeve is simple in structure and low in cost.
The vibrating wire 4 penetrates through the small sleeve 6, two ends of the vibrating wire 4 are clamped by the clamping pieces 3, the clamping pieces 3 are respectively inserted into the left sensor end 201 and the right sensor end 202, after the vibrating wire 4 penetrates through a through hole reserved in the middle of the clamping pieces, fastening nails penetrate through the outer sides of the clamping pieces to press two opposite sides of the clamping pieces, and therefore the vibrating wire is clamped.
The magnetic induction ring 12 is wrapped and fixed on the small sleeve 6 through an epoxy resin layer, the two ends of the small sleeve 6 are not covered, signals of the magnetic induction ring 12 are output from a cable 13, and the cable 13 penetrates through the elastic element 9 and is positioned on the outer side of the outer sleeve 5;
the grating structure comprises a strain grating 10 and a temperature compensation grating 11, wherein the strain grating 10 is pasted on the inner side surface of the elastic element 9, the temperature compensation grating 11 is pasted on the outer surface of the small sleeve 6, and tail fibers 111 of the strain grating 10 and the temperature compensation grating 11 penetrate out of the elastic element 9 and are located on the outer side of the outer sleeve 5.
In the technical scheme, the optical fiber type and vibrating wire 4 type sensors are combined, data can be compared with each other during measurement, the vibrating wire 4 type sensors are fully exerted, the measurement is easy, the cost is low, the sensors are not easy to damage in severe environment, the dynamic performance of the grating type sensors is good, the measurement is accurate, the creep deformation is small, and the anti-fatigue service life is long.
In another technical scheme, the mounting support 1 comprises a base and a pair of ear plates; the pair of ear plates are arranged on the base at intervals along the axial direction of the outer sleeve 5, a U-shaped bayonet is formed in each ear plate 101, and screw holes 102 are formed in two sides of each bayonet;
the left sensor end 201 and the right sensor end 202 penetrate through the middle part of the mounting support 1 and extend outwards to form a fixing part 2;
wherein the fastening bolt 14 penetrates the screw hole to fix the left sensor head 201 and the right sensor head 202 from both sides.
In above-mentioned technical scheme, abandon the traditional thinking that meets an emergency through frictional force transmission, utilize thin screw rod to come the horizontal transmission to meet an emergency, guarantee that the transmission loss that meets an emergency is little, improve the accuracy of measurement.
In another solution, the strain grating 10 and the pigtail 111 of the temperature compensation grating 11 are threaded into the cable 13 and are threaded out of the elastic element 9 together.
In another technical scheme, the elastic element 9 is made of alloy steel, the wall thickness of the elastic element is 0.5mm, the alloy steel is adopted, the elasticity of the elastic element is high, the strain grating 10 is pasted on the inner surface of the elastic element 9, the installation is convenient, the batch production is easy, and meanwhile, the measurement precision is also ensured.
In another technical scheme, the sealing device further comprises a sealing cover 8 which is covered on the outer part of the elastic element 9 and is fixed through the first bolt 7 so as to seal the elastic element 9 with the outer part.
In another technical scheme, the diameter of the outer sleeve 5 is 7-9mm, and the diameter of the small sleeve 6 is 2-3 mm.
Example 1
As shown in fig. 1 to 4, the surface-mounted sensor with an adjustable initial value for optical fiber vibrating wire combination includes:
the outer sleeve 5 is composed of a left sleeve and a right sleeve, and the left end of the left sleeve and the right end of the right sleeve are respectively plugged by a left sensor end 201 and a right sensor end 202; the left sensor head 201 and the right sensor head 202 are fixed to the outer sleeve 5 by laser welding.
A pair of mounting supports 1 respectively located at two ends of the outer sleeve 5 and respectively fixed with the left sensor end 201 and the right sensor end 202;
the elastic element 9 is of a hollow cylindrical structure, a first preformed hole is formed in one side, facing the left sleeve, of the elastic element 9, an opening is formed in one side, facing the right sleeve, of the elastic element, and the left sleeve and the right sleeve are fixed with the elastic element 9 in a laser welding mode;
and the small sleeve 6 is arranged in the elastic element 9, one end of the small sleeve 6 penetrates out of the first reserved hole and is welded with the first reserved hole, the other end of the small sleeve 6 penetrates out of the opening, and the opening is not in contact with the small sleeve 6.
The vibrating wire 4 penetrates through the small sleeve 6, two ends of the vibrating wire 4 are clamped by the clamping pieces 3, the clamping pieces 3 are respectively inserted into the left sensor end 201 and the right sensor end 202, after the vibrating wire 4 penetrates through a through hole reserved in the middle of the clamping pieces, fastening nails penetrate through the outer sides of the clamping pieces to press two opposite sides of the clamping pieces, and therefore the vibrating wire is clamped.
The magnetic induction ring 12 is wrapped and fixed on the small sleeve 6 through an epoxy resin layer, the two ends of the small sleeve 6 are not covered, signals of the magnetic induction ring 12 are output from a cable 13, and the cable 13 penetrates through the elastic element 9 and is positioned on the outer side of the outer sleeve 5;
the grating structure comprises a strain grating 10 and a temperature compensation grating 11, wherein the strain grating 10 is pasted on the inner side surface of the elastic element 9, the temperature compensation grating 11 is pasted on the outer surface of the small sleeve 6, and tail fibers 111 of the strain grating 10 and the temperature compensation grating 11 penetrate out of the elastic element 9 and are located on the outer side of the outer sleeve 5.
Wherein, the mounting support 1 comprises a base and a pair of ear plates 101; a pair of ear plates 101 are arranged on the base at intervals along the axial direction of the outer sleeve 5, U-shaped bayonets are arranged on the ear plates 101, and screw holes 102 are arranged on two sides of the bayonets;
the left sensor end 201 and the right sensor end 202 penetrate through the middle part of the mounting support 1 and extend outwards to form a fixing part 2;
wherein the fastening bolt 14 penetrates the screw hole to fix the left sensor head 201 and the right sensor head 202 from both sides.
Wherein the strain grating 10 and the tail fiber 111 of the temperature compensation grating 11 penetrate into the cable 13 and together pass out of the elastic element 9.
Wherein, the elastic element 9 is made of alloy steel, the wall thickness of the elastic element is 0.5mm, the elastic element is made of alloy steel, the elasticity of the elastic element is large, and the strain grating 10 is adhered to the inner surface of the elastic element 9.
The sealing device further comprises a sealing cover 8 which is covered on the outer portion of the elastic element 9 and is fixed through the first bolt 7 so as to seal the elastic element 9 with the outer portion.
Wherein, the diameter of the outer sleeve 5 is 9mm, and the diameter of the small sleeve 6 is 2 mm.
The sensor of example 1 and a commercially available vibrating wire sensor (comparative example 1) as shown in fig. 6 were subjected to strain loss measurement for half a year, and the results are shown in fig. 5.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (6)
1. Optical fiber vibrating wire combination and adjustable initial value surface-mounted sensor, its characterized in that includes:
the outer sleeve is composed of a left sleeve and a right sleeve, and the left end of the left sleeve and the right end of the right sleeve are respectively plugged by a left sensor end and a right sensor end;
the pair of mounting supports are respectively positioned at two ends of the outer sleeve and are respectively fixed with the left sensor end and the right sensor end;
the elastic element is of a hollow cylindrical structure, a first preformed hole is formed in one side, facing the left sleeve, of the elastic element, an opening is formed in one side, facing the right sleeve, of the elastic element, and the left sleeve and the right sleeve are both fixed with the elastic element;
the small sleeve is arranged in the elastic element, one end of the small sleeve penetrates through the first preformed hole and is welded with the first preformed hole, the other end of the small sleeve penetrates through the opening, and the opening is not contacted with the small sleeve;
the vibrating wire penetrates through the small sleeve, two ends of the vibrating wire are clamped by the clamping pieces, and the clamping pieces are respectively inserted into the left sensor end and the right sensor end;
the magnetic induction ring is wrapped and fixed on the small sleeve through an epoxy resin layer and does not cover two ends of the small sleeve, a signal of the magnetic induction ring is output from a cable, and the cable penetrates out of the elastic element and is positioned on the outer side of the outer sleeve;
the strain grating is pasted on the inner side surface of the elastic element, the temperature compensation grating is pasted on the outer surface of the small sleeve, and the tail fibers of the strain grating and the temperature compensation grating penetrate out of the elastic element and are located on the outer side of the outer sleeve.
2. The fiber optic vibrating wire combination and initial value tunable surface mount sensor of claim 1, wherein the mounting bracket includes a base and a pair of ear plates; the pair of ear plates are arranged on the base at intervals along the axial direction of the outer sleeve, U-shaped bayonets are formed in the ear plates, and screw holes are formed in the two sides of the bayonets;
the left sensor end and the right sensor end penetrate through the middle part of the mounting support and extend towards the outer periphery to form fixing pieces;
and fastening bolts penetrate into the screw holes to fix the left sensor end head and the right sensor end head from two sides.
3. The fiber optic vibrating wire combination and initial value tunable surface mount sensor of claim 1, wherein the pigtails of the strain grating and the temperature compensation grating pass into the cable and out of the resilient element together.
4. The fiber optic vibrating wire combination and initial value tunable surface mount sensor according to claim 1, wherein said resilient element is formed of an alloy steel having a wall thickness of 0.5 mm.
5. The fiber optic vibrating wire combination and initial value tunable surface mount sensor according to claim 1, further comprising a cover covering the exterior of the resilient member to enclose the resilient member from the exterior.
6. The fiber optic vibrating wire combination and initial value tunable surface mount sensor according to claim 1, wherein the outer sleeve has a diameter of 7-9mm and the small sleeve has a diameter of 2-3 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810411783.0A CN108759701B (en) | 2018-05-02 | 2018-05-02 | Surface-mounted sensor with optical fiber vibrating wire combination and adjustable initial value |
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| CN201810411783.0A CN108759701B (en) | 2018-05-02 | 2018-05-02 | Surface-mounted sensor with optical fiber vibrating wire combination and adjustable initial value |
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| CN108759701A CN108759701A (en) | 2018-11-06 |
| CN108759701B true CN108759701B (en) | 2020-03-03 |
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| CN110332914A (en) * | 2019-07-29 | 2019-10-15 | 基康仪器股份有限公司 | A kind of type vibration wire water pressure resistance strain gauge |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE29720741U1 (en) * | 1997-11-22 | 1998-05-28 | aerodyn Engineering GmbH, 24768 Rendsburg | Device for detecting vibrations of the rotor blades of a wind turbine |
| CN2751282Y (en) * | 2004-12-01 | 2006-01-11 | 周国玉 | Steel plate strain meter |
| US20070193362A1 (en) * | 2006-02-06 | 2007-08-23 | Ferguson Stephen K | Fiber optic strain gage |
| US7815376B2 (en) * | 2008-06-30 | 2010-10-19 | Intuitive Surgical Operations, Inc. | Fixture for shape-sensing optical fiber in a kinematic chain |
| CN102410817A (en) * | 2010-09-20 | 2012-04-11 | 孙斌 | Temperature self-compensating type fiber grating strain transducer |
| CN201819662U (en) * | 2010-10-13 | 2011-05-04 | 杭州云星雨测控技术有限公司 | Clamp block with circular slot at bottom of clamp gap used for vibrating wire strain gauge |
| KR20130103872A (en) * | 2012-03-12 | 2013-09-25 | (주)에프비지코리아 | Fbg strain sensors easy to install on curved surface |
| CN202709986U (en) * | 2012-04-18 | 2013-01-30 | 苏州筑邦测控科技有限公司 | Restorable vibrating wire type surface strainmeter |
| CN203629533U (en) * | 2013-11-15 | 2014-06-04 | 哈尔滨工业大学深圳研究生院 | Device for adjusting initial installation value of vibratory string type strain gauge |
| CN104697682A (en) * | 2014-04-04 | 2015-06-10 | 南京大学（苏州）高新技术研究院 | Fiber Bragg grating strain-measuring method and fiber Bragg grating strain sensor |
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