CN111044198A - Magneto-elastic cable force sensor of fiber grating - Google Patents
Magneto-elastic cable force sensor of fiber grating Download PDFInfo
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- CN111044198A CN111044198A CN202010002095.6A CN202010002095A CN111044198A CN 111044198 A CN111044198 A CN 111044198A CN 202010002095 A CN202010002095 A CN 202010002095A CN 111044198 A CN111044198 A CN 111044198A
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- fiber grating
- anchor cable
- bragg grating
- cable force
- force sensor
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- 239000000835 fiber Substances 0.000 title claims abstract description 55
- 239000000463 material Substances 0.000 claims description 13
- 238000009434 installation Methods 0.000 claims description 6
- 230000005291 magnetic effect Effects 0.000 abstract description 20
- 238000005259 measurement Methods 0.000 abstract description 7
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000005672 electromagnetic field Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 7
- 239000003302 ferromagnetic material Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
- G01L1/246—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre using integrated gratings, e.g. Bragg gratings
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention belongs to the technical field of geotechnical engineering monitoring, and provides a magneto-elastic cable force sensor of a fiber grating. The invention makes full use of the superiority of the fiber grating technology, the fiber grating is anti-electromagnetic interference, when the fiber grating magnetic dynamometer and the anchor cable form a magnetic loop, the fiber grating can not cause the measurement error due to the existence of the electromagnetic field, and the defect of larger measurement error caused by the mutual influence of the double-coil structure of the traditional magnetic dynamometer is overcome.
Description
Technical Field
The invention belongs to the technical field of geotechnical engineering monitoring, and relates to a magneto-elastic cable force sensor of a fiber grating.
Background
The slope prestress strengthening engineering is a method for reducing the landslide problem. The most common slope prestress reinforcement engineering is to add an anchor cable structure into a slope body, so that the method has very important significance in accurately measuring the prestress change of the anchor cable structure. At present, the commonly used anchor cable force monitoring means are a pressure sensor, a vibration wave method and a vibration frequency method. The pressure sensor mainly comprises a resistance strain type, a vibration wire type and a fiber bragg grating, a base plate and a bearing ring are additionally arranged between an anchor head of the anchor cable and concrete, so that the cable force of the anchor cable is completely acted on the bearing ring, and the magnitude of the cable force of the anchor cable is monitored by measuring the strain of the bearing ring. The vibration wave method and the vibration frequency method are both used for applying vibration on the cable to monitor the cable force of the anchor cable, and are not suitable for the cable force of the anchor cable in the side slope soil body.
The measurement of the cable force of the anchor cable based on the magnetoelastic effect is a novel monitoring method which is widely applied at present. The measurement principle is as follows: when the stress state of the ferromagnetic material is changed after the ferromagnetic material is magnetized by an external magnetic field, parameters such as internal magnetic conductivity and the like of the ferromagnetic material are changed, and the cable force of the anchor cable can be measured by deducing the relation between the changed magnetic characteristic parameters and the cable force of the anchor cable.
The traditional magnetoelastic cable force sensor is divided into two types, one type is a sleeve type magnetoelastic cable force sensor, the structure is relatively simple, the precision is high, the cost is low, and the like, the magnetoelastic cable force sensor is widely applied to anchor cable force monitoring, but the magnetoelastic cable force sensor needs to be processed together with an anchor cable, is produced uniformly, is relatively complex to transport and is easy to damage; the other type is a bypass type magnetic-elastic cable force sensor, although the defect of difficult installation is solved, the mutual influence problem still exists in the double-coil structure nested inside and outside the sensor.
The fiber grating is used as a novel measuring element, when the temperature and the strain change, the central wavelength of the fiber grating can change, and the influence of the temperature on the central wavelength can be eliminated through the difference of the layout forms, so that the accurate strain change is obtained. The fiber grating has the good characteristics of electromagnetic interference resistance, corrosion resistance and the like, and is suitable for being used as a measuring element of the magneto-elastic cable force sensor.
Therefore, the invention provides a magneto-elastic cable force sensor capable of accurately measuring cable force of an anchor cable by adopting fiber gratings and magnetostrictive technologies aiming at the problems.
Disclosure of Invention
Aiming at the problems that the existing magneto-elastic cable force sensor is not easy to install and the error is large due to mutual influence of double coils, the invention provides the fiber grating magneto-elastic cable force sensor by utilizing fiber gratings and magnetostrictive materials, which can accurately measure the cable force of an anchor cable and overcome the defects of low measurement precision, complex installation, weak data transmission capability and the like of the traditional cable force meter.
The technical scheme of the invention is as follows:
a magneto-elastic cable force sensor of fiber bragg grating comprises a fixing device, a measuring device 2, an exciting coil 1, a magnet 6 and a yoke 7;
the fixing device comprises bolts 3, anchor cables 4 and anchor cable clamps 5, and the anchor cable clamps 5 are connected with the anchor cables 4 by four groups of bolts 3;
the measuring device 2 comprises a fiber grating, a magnetostrictive material 10 and a fiber grating demodulator 11; the fiber bragg grating comprises a strain fiber bragg grating 8 and a temperature compensation fiber bragg grating 9, wherein the strain fiber bragg grating 8 and the temperature compensation fiber bragg grating 9 are fixedly arranged on a magnetostrictive material 10, both are connected with a fiber bragg grating demodulator 11, and are arranged vertically;
one end of each magnet 6 is fixed on the anchor cable clamp 5, and the other ends of the two magnets 6 are connected through a yoke 7; one magnet 6 is provided with an installation groove, and the measuring device 2 is installed in the installation groove;
the exciting coils 1 are symmetrically arranged on two sides of a magnet 6 provided with the measuring device 2.
The exciting coil 1 is electrified by a direct current variable frequency power supply, the magnetization intensity vector is changed according to the magnetoelastic effect, namely the magnetic conductivity of the magnet 6 is changed due to the fact that the magnetic elastic energy of the magnetized magnet 6 is changed when the magnet is stressed, the magnetostrictive material 11 is changed, the strain of the magnetostrictive material 11 is measured by the strain fiber grating 8, the temperature compensation is carried out on the strain through the temperature compensation fiber grating 9, and therefore the cable force of the anchor cable 4 is accurately deduced.
The invention can be prefabricated in a factory due to the arrangement of the fixing device, and can be directly transported to the site to be installed on the anchor cable 4 to be tested, and the strain of the magnetostrictive material 11 is measured by the fiber bragg grating while the anchor cable 4 is stressed, so that the internal cable force of the anchor cable 4 is deduced.
The invention has the beneficial effects that: the advantages of the fiber grating technology are fully utilized, the fiber grating is prevented from electromagnetic interference, when the fiber grating magnetic dynamometer and the anchor cable form a magnetic loop, the fiber grating cannot cause measurement errors due to the existence of an electromagnetic field, and the defect that the measurement errors are large due to the mutual influence of a double-coil structure of the traditional magnetic dynamometer is overcome.
Drawings
FIG. 1 is a diagram of the internal structure of a fiber grating magnetic spring dynamometer provided by the present invention;
fig. 2 is a schematic view of a measuring device of the fiber grating magnetic elastometer provided by the invention.
In the figure: 1 exciting a coil; 2, a measuring device; 3, bolts; 4, anchor cables; 5, anchor cable clamps; 6, a magnet; 7 a yoke iron; 8 strain fiber grating; 9 temperature compensation fiber grating; 10 a magnetostrictive material; 11 fiber grating demodulator.
Detailed Description
The following further describes a specific embodiment of the present invention with reference to the drawings and technical solutions.
Fig. 1 is an internal structural view of a fiber grating magnetoelastic force sensor provided by the present invention, which includes a fixing device and a measuring device 2, and further includes an excitation coil 1, a measuring device 2, a bolt 3, an anchor cable 4, an anchor cable clamp 5, a magnet 6, and a yoke 7. Fig. 2 is a schematic view of a measuring device of a magneto-elastic cable force sensor of a fiber grating provided by the invention, and the measuring device 2 includes a strain fiber grating 8, a temperature compensation fiber grating 9, a magnetostrictive material 10, and a fiber grating demodulator 11.
The magneto-elastic cable force sensor of the fiber bragg grating is connected with an anchor cable 4 through an anchor cable clamp 5 by utilizing four groups of bolts 3 to form a bypass structure. The fiber grating magnetic spring dynamometer is composed of an exciting coil 1, a measuring element 2, a yoke 6 and a magnet 7. The exciting coil is electrified by a direct current variable frequency power supply, the magnetization intensity vector is changed according to the magnetoelastic effect, namely the internal magnetoelastic energy of the magnetized ferromagnetic material is changed when the ferromagnetic material is stressed, so that the magnetic conductivity of the material is changed, the strain of the magnetostrictive material is measured by the strain fiber grating 8, the change of the peripheral temperature is measured by the temperature compensation fiber grating 9, and the internal cable force of the anchor cable can be deduced.
The invention is a bypass type structure, according to the equivalent principle of the magnetic circuit, replace the original two parallel branch magnetic circuit structures with a non-branch magnetic circuit structure, form the bypass type structure, regard anchor rope as a part of the magnetic circuit, but not the iron core, and design the outer end of magnetic pole into a special fixture, link closely with the anchor rope through the bolt, because the bypass type structure does not wear the set coil, can prefabricate in the factory, transport to the scene and install on the anchor rope to be measured directly, measure the strain of the magnetostrictive material by the fiber bragg grating while the anchor rope is stressed, thus deduce the mechanical force that the anchor rope receives.
Claims (1)
1. The magneto-elastic cable force sensor of the fiber bragg grating is characterized by comprising a fixing device, a measuring device (2), an exciting coil (1), a magnet (6) and a yoke (7);
the fixing device comprises bolts (3), an anchor cable (4) and anchor cable clamps (5), and the anchor cable clamps (5) are connected with the anchor cable (4) through four groups of bolts (3);
the measuring device (2) comprises a fiber grating, a magnetostrictive material (10) and a fiber grating demodulator (11); the fiber bragg grating comprises a strain fiber bragg grating (8) and a temperature compensation fiber bragg grating (9), the strain fiber bragg grating (8) and the temperature compensation fiber bragg grating (9) are fixedly arranged on a magnetostrictive material (10), and are both connected with a fiber bragg grating demodulator (11) and are arranged vertically to each other;
one end of each magnet (6) is fixed on the anchor cable clamp (5), and the other ends of the two magnets (6) are connected through a yoke (7); one magnet (6) is provided with an installation groove, and the measuring device (2) is installed in the installation groove;
the exciting coils (1) are symmetrically arranged on two sides of the magnet (6) provided with the measuring device (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010002095.6A CN111044198B (en) | 2020-01-02 | Fiber bragg grating's magnetic spring cable force transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010002095.6A CN111044198B (en) | 2020-01-02 | Fiber bragg grating's magnetic spring cable force transducer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111044198A true CN111044198A (en) | 2020-04-21 |
| CN111044198B CN111044198B (en) | 2024-06-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112067173A (en) * | 2020-09-29 | 2020-12-11 | 刘翡琼 | Spiral pressure detector |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2476805Y (en) * | 2001-05-23 | 2002-02-13 | 祝向永 | Piezomagnetic type cable force sensor used in back strentching cable system |
| US20090169380A1 (en) * | 2007-12-26 | 2009-07-02 | Jacob Johannes Nies | Magnetostrictive measurement of tensile stress in foundations |
| CN202216784U (en) * | 2011-06-03 | 2012-05-09 | 大连理工大学 | Fiber grating cable tension sensor with temperature self-compensation |
| CN110095092A (en) * | 2019-05-15 | 2019-08-06 | 大连理工大学 | A kind of inclinometer based on fiber grating and magnetostriction materials |
| CN210981613U (en) * | 2020-01-02 | 2020-07-10 | 大连理工大学 | Magneto-elastic cable force sensor of fiber grating |
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2476805Y (en) * | 2001-05-23 | 2002-02-13 | 祝向永 | Piezomagnetic type cable force sensor used in back strentching cable system |
| US20090169380A1 (en) * | 2007-12-26 | 2009-07-02 | Jacob Johannes Nies | Magnetostrictive measurement of tensile stress in foundations |
| CN202216784U (en) * | 2011-06-03 | 2012-05-09 | 大连理工大学 | Fiber grating cable tension sensor with temperature self-compensation |
| CN110095092A (en) * | 2019-05-15 | 2019-08-06 | 大连理工大学 | A kind of inclinometer based on fiber grating and magnetostriction materials |
| CN210981613U (en) * | 2020-01-02 | 2020-07-10 | 大连理工大学 | Magneto-elastic cable force sensor of fiber grating |
Non-Patent Citations (1)
| Title |
|---|
| 姜建山;唐德东;周建庭;: "桥梁索力测量方法与发展趋势", 重庆交通大学学报(自然科学版), no. 03, 15 June 2008 (2008-06-15) * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112067173A (en) * | 2020-09-29 | 2020-12-11 | 刘翡琼 | Spiral pressure detector |
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