CN204575225U - A kind of piezomagnetic strain gauge - Google Patents
A kind of piezomagnetic strain gauge Download PDFInfo
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- CN204575225U CN204575225U CN201520132555.1U CN201520132555U CN204575225U CN 204575225 U CN204575225 U CN 204575225U CN 201520132555 U CN201520132555 U CN 201520132555U CN 204575225 U CN204575225 U CN 204575225U
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Abstract
The utility model provides a kind of piezomagnetic strain gauge.This sensor comprises support housing, the stress bearing object be connected with support housing outside, and is positioned at the first magnet of support housing inside; First magnet is magnetostriction materials; First magnet two ends are fixedly connected with support housing inwall; During duty, extraneous effect of stress is on stress bearing object, and support housing generation deformation causes the first magnet generation deformation, and thus the magnetic of the first magnet changes, and its impedance changes thereupon.This sensor construction is simple, highly sensitive, cost is low, can be used for highway weight and charge system, the contour stress monitoring of industrial automation Weighing system, also can be used for microstress strain monitoring.
Description
Technical field
The utility model relates to stress mornitoring field, especially relates to a kind of piezomagnetic strain gauge.
Background technology
Strain gauge is one of sensor commonly used in industry, is widely used in field of industrial automatic control, relates to numerous industries such as water conservancy and hydropower, railway traffic, intelligent building, production automatic control, Aero-Space, military project, lathe.
Along with the development of flexible electronic and wearable device, strain gauge more and more receives the concern of people.Traditional strain gauge is based on physical construction type device, and utilize elastic deformation or the fluid column pressure difference feedback applied pressure of flexible member, its shortcoming is that size is large, volume heavy and electricity can not be provided to export, and is unfavorable for the system integration.
Along with the development of science and technology, new material and new physical influence are constantly applied in strain gauge, make strain gauge achieve tremendous development.Divide according to principle of work, strain gauge can be divided into pressure resistance type, condenser type, piezoelectric type, optical fiber type and piezomagnetic etc.
The principle that pressure resistance type strain gauge utilizes the change of the electrical resistance ambient pressure of metal or semiconductor and changes carries out work.The pressure resistance type strain gauge mainly silicon substrate pressure sensor of current application, has that measuring accuracy is high, reproducible, good stability, test pressure wider range, output signal is strong, volume is little, be beneficial to the advantages such as integrated.But the serviceability temperature of silicon substrate pressure sensor, generally lower than 125 DEG C, can not at high temperature use, and measured low pressure limit is generally 1000Pa, can not measure ultra-miniature pressure.The principle that capacitance-type strain gauge force snesor utilizes electric capacity to change with pressure change carries out work, has that structure is simple, measuring accuracy is high, good stability, low in energy consumption, the linearity good, volume is little and be beneficial to the advantages such as integrated.But capacitance-type strain gauge force snesor is vulnerable to connect the effect of parasitic capacitance in wire, therefore requires higher to metering circuit.Piezoelectric type strain gauge is the pressure transducer made according to piezoelectric effect, has that measuring accuracy is high, test pressure wide ranges, serviceability temperature wide ranges, volume are little, be beneficial to the advantages such as integrated.But piezoelectric type strain gauge is very sensitive to measuring tempeature, usually need to utilize inner temp measuring system to carry out calibrating or need to adopt constant temperature system; In addition, piezoelectric type strain gauge is mainly used in the measurement of acceleration and angular velocity, is generally not used in static pressure measurement.Optical fiber type strain gauge is when utilizing extraneous stress changes, the principle that the light intensity of the light of propagation in a fiber, phase place or polarization property change with the change of extraneous stress carries out work, but this sensor needs complicated light path treatment facility, expensive.
Main material in piezomagnetic strain gauge is magnetostriction materials.Magnetostriction materials have magnetostrictive effect, and namely under outside magnetic field effect, the shape of magnetostriction materials changes; On the other hand, when magnetostriction materials generation deformation, its magnetic changes, i.e. counter magnetostriction effect.Piezomagnetic strain gauge utilizes counter magnetostriction effect and works, and when magnetostriction materials, under effect of stress, deformation occur, its magnetic changes, and the impedance causing magnetostriction materials or the element impedance being arranged in its magnetic field change.
Piezomagnetic strain gauge has high sensitivity, the linearity is good, temperature stability is good, output power is large, the advantage of long service life, therefore day by day pay close attention to by people.At present, structure is simple, highly sensitive, the piezomagnetic strain gauge of stable performance is the study hotspot of scientific worker, has a good application prospect.
Utility model content
Technical purpose of the present utility model is to provide that a kind of structure is simple, highly sensitive, the piezomagnetic strain gauge of stable performance.
In order to realize above-mentioned technical purpose, the technical scheme that the utility model adopts is: a kind of piezomagnetic strain gauge, comprises support housing, the stress bearing object be connected with support housing outside, and is positioned at the first magnet of support housing inside;
The first described magnet is magnetostriction materials, that is, have magnetostriction;
In support housing, the part be connected with stress bearing object is pressure-bearing part, and pressure bearing body is positioned at the outer wall of pressure-bearing part;
First magnet two ends are fixedly connected with the inwall of pressure-bearing part, or magnet two ends are fixedly connected with by the inwall of connector with pressure-bearing part;
During duty, extraneous effect of stress is on stress bearing object, and pressure-bearing part is subject to compressive stress and deformation occurs, and the deformation of this pressure-bearing part weakens towards periphery centered by the position be connected with stress bearing object; The deformation of described pressure-bearing part causes the first magnet generation deformation, and the deformation of this first magnet causes the magnetic of the first magnet to change, and the impedance of this first magnet changes thereupon, exports this impedance by the conductor be connected with the first magnet two ends.
As preferably, described piezomagnetic strain gauge also comprises the second magnet, this second magnet is positioned at support housing inside, for the first magnet provides bias magnetic field, when the first magnet generation deformation, its distance from the second magnet changes, bias magnetic field suffered by first magnet is changed, this causes the change of the first magnet magnetic, is equivalent to the magnetic knots modification being exaggerated the first magnet, is conducive to improving sensing sensitivity.
As preferably, described connector is two fixed blocks being connected to support end inwall.Adopt securing member to be fixedly connected with one of them fixed block one end of the first magnet, adopt securing member to be fixedly connected with another fixed block by the other end of the first magnet.Or each fixed block arranges jack, one end of the first magnet is inserted in the jack of one of them fixed block, and the other end of the first magnet inserts in the jack of another fixed block.Or, two kinds of modes combined, namely each fixed block arranges jack, and one end of the first magnet is inserted in the jack of one of them fixed block, the other end of the first magnet inserts in the jack of another fixed block, and the first magnet ends in each fixed block fixed by employing securing member simultaneously.
Described securing member comprises contact screw or non-conductive screw, when selecting contact screw, can draw wire, for impedance values from this screw.
In order to improve the sensitivity of this piezomagnetic strain gauge further, can also arrange coil in the periphery of described first magnet, that is, described first magnet is through this coil inside; When the magnetic of described first magnet changes, coil impedance changes thereupon, and the resistance value of this coil is exported by coil two ends.In this case, as preferably, described coil count is greater than or equal to two, there is spacing between adjacent coil, and each coils connected in series together, to improve the variable quantity of coil impedance further, thus improves sensitivity.More preferably, this piezomagnetic strain gauge also comprises at least one power conductor, this power conductor one end is fixedly connected with support end inwall, the other end is fixedly connected on the position between the first magnet two ends, be directly conducted between the first magnet two ends for pressure-bearing part being subject to compressive stress, thus increase the deformation quantity of the position between the first magnet two ends, thus improve the overall deformation of the first magnet, be conducive to improving sensing sensitivity.
As preferably, described coil is positioned on support, to facilitate adjustment coil position.Described supporting structure is not limit, and can be the fixed mount and/or the fixed bar that are fixed on support housing inside.
The first described magnet is magnetostriction materials system, comprises magnetostrictive metals, magnetostriction alloy, amorphous magnetostriction materials etc.As preferably, select iron-based and cobalt base amorphous magnetostriction materials, comprise FeSiB, FeCuNbSiB, FeNiSiB, FeCoSiB, GdFeCo, CoSiB etc.
It can be stainless steel, Al, Cu, plastics etc. that described support housing adopts.In order to avoid external magnetic field produces the magnetic field of support housing inside, as preferably, described support housing material adopts soft magnetic material to make, or support housing periphery arranges layer of soft magnetic material, carries out magnetic shielding in order to magnetic field to external world.
Described impedance output (comprise the conductor end being connected to the first magnet two ends, and/or coil two ends) be connected with electric impedance analyzer; Or described impedance output and resistance form wheatstone bridge configuration, and impedance output is a brachium pontis of Wheatstone bridge, and the output of Wheatstone bridge and voltage table or reometer or electric impedance analyzer are connected.
In sum, the utility model provides a kind of piezomagnetic strain gauge, by the design of structure, extraneous effect of stress is produced compressive stress on stress bearing object, this compressive stress is passed to the pressure-bearing part of support housing by stress bearing object, pressure-bearing part generation deformation, this deformation quantity is that center is strong, weaken distribution gradually around, therefore the first magnet deformation be connected with this pressure-bearing part is caused, thus the magnetic of first magnet with Magnetostriction is changed, its impedance changes thereupon, the impedance being arranged on the coil of its periphery also changes thereupon, by detecting the impedance variation value of this first magnet, or the impedance transformation value of this coil can realize this stress mornitoring.
The advantages such as this sensor has simple, highly sensitive, the easy installation of structure, easy care, cost is low, wireless exploration is compatible, can be applicable to different technical fields, such as, for the axle weight scale in highway weight and charge system; Batch can scale in industrial automation detection system, storage scale, bunker scale; Vehicle carried article is weighed contour stress monitoring system, also can be used for microstress monitoring, the fields such as the measurement of such as micron order displacement, microstress and strain measurement.
Accompanying drawing explanation
Fig. 1 is the structural representation of piezomagnetic strain gauge in the utility model embodiment 1;
Fig. 2 is the structural representation of piezomagnetic strain gauge in the utility model embodiment 2;
Fig. 3 is the structural representation of piezomagnetic strain gauge in the utility model embodiment 3.
Embodiment
Below in conjunction with accompanying drawing embodiment, the utility model is described in further detail.
Reference numeral in Fig. 1 and Fig. 2 is: housing 1, base 2, perforation 3, stress bearing object 4, column 5, fixed bar 6, second magnet 7, fixed leg 8, fixed mount 9, first magnet 10, screw 11, coil tube 12, enameled wire 13, fixed jack 14, power conductor 15.
Embodiment 1:
In the present embodiment, piezomagnetic strain gauge structure as shown in Figure 1, comprises support housing, the stress bearing object 4 be connected with support housing outside, and is positioned at the first magnet 10 and the second magnet 7 of support housing inside.
Support housing is made up of base 2 and housing 1.
Stress bearing object 4 is connected to the tip position of support housing, and this tip position is the pressure-bearing part of support housing, and stress bearing object 4 is positioned at the outside wall surface of pressure-bearing part, and the internal face of pressure-bearing part is fixedly connected with two fixed mounts 9.
Each fixed mount 9 has fixed jack 14.One end of first magnet 10 is inserted in the jack of one of them fixed block, and the other end of the first magnet inserts in the jack of another fixed block.Meanwhile, screw 11 is adopted to contact first magnet ends of fixing in each fixed block.
Second magnet 7 is positioned on column 5, and column 5 is fixed on base 2, is fixed on the sidewall of housing 1 by fixed bar 6 simultaneously.
First magnet 10 selects FeCoSiB material, is band, bandwidth 0.5 millimeter, tape thickness 30 microns.
Housing 1 adopts stainless steel to make, and its periphery is coated with the permalloy of soft magnetism.
The sidewall of housing 1 arranges perforation 3.Conduction screw selected by screw 11, and this conduction screw is drawn wire and passed from perforation 3, is connected with electric impedance analyzer.
During duty, extraneous effect of stress is on stress bearing object 4, and case top is subject to compressive stress and deformation occurs, and the deformation of this case top weakens to surrounding centered by the position that case top is connected with stress bearing object.The deformation of this case top causes the first magnet 10 that deformation occurs.The deformation of this first magnet 10 causes the magnetic of the first magnet 10 to change.Simultaneously, due to the second magnet 7 for the first magnet 10 provides bias magnetic field, when there is deformation in the first magnetic 10, its distance from the second magnet 7 changes, this makes the bias magnetic field suffered by the first magnet 10 change, this can cause the change of the first magnet 10 magnetic, is equivalent to the magnetic knots modification being exaggerated the first magnet 10.In the present embodiment, conduction screw selected by screw, and this conduction screw is drawn wire and passed from perforation 3, is connected with electric impedance analyzer, by the stress of the change and detectable applying of measuring the first magnet 10 impedance.
In the present embodiment, the first magnet 10 is FeCoSiB material, and under unit strain effect, the change of its magnetic permeability reaches 10
5, therefore, it is possible to detection 10
-6the microstrain of rank.
Embodiment 2:
In the present embodiment, as shown in Figure 2, this structure is substantially identical with the piezomagnetic strain gauge structure in embodiment 1 for piezomagnetic strain gauge structure, and difference is that the periphery of the first magnet 10 arranges coil, that is, the first magnet 10 is through this coil inside.Coil forms by coil tube 12 and around the enameled wire 13 outside coil tube 12, and enameled wire 13 two ends pass from perforation 3, are connected with electric impedance analyzer.Second magnet 7 is positioned at immediately below coil.Coil is arranged on the second magnet 7 by fixed leg 8.
During duty, extraneous effect of stress is on stress bearing object 4, and case top is subject to compressive stress and deformation occurs, and the deformation of this case top weakens to surrounding centered by the position that case top is connected with stress bearing object.The deformation of this case top causes the first magnet 10 that deformation occurs.The deformation of this first magnet 10 causes the magnetic of the first magnet 10 to change.Simultaneously, due to the second magnet 7 for the first magnet 10 provides bias magnetic field, when there is deformation in the first magnetic 10, its distance from the second magnet 7 changes, this makes the bias magnetic field suffered by the first magnet 10 change, this can cause the change of the first magnet 10 magnetic, is equivalent to the magnetic knots modification being exaggerated the first magnet 10.When the magnetic of the first magnet 10 changes, the impedance of the first magnet 10 changes thereupon, is exported the impedance of the first magnet 10 by the wire be connected with screw 11; Meanwhile, coil impedance changes thereupon, and the resistance value of this coil is exported by coil two ends.
Embodiment 3:
In the present embodiment, piezomagnetic strain gauge structure as shown in Figure 3, this structure is substantially identical with the piezomagnetic strain gauge structure in embodiment 2, difference is that the periphery of the first magnet 10 in this structure arranges two coils, namely, through these two coil inside, and there is spacing between two coils in the first magnet 10, two coils connected in series together.Secondly, this piezomagnetic strain gauge also comprises a power conductor 15, this power conductor 15 one end is fixedly connected on case top inwall, the other end is fixedly connected on the position between the first magnet 10 two ends, be directly conducted between the first magnet 10 two ends for case top being subject to compressive stress, to increase the deformation quantity of position between the first magnet two ends, thus improve the overall deformation of the first magnet, be conducive to improving sensing sensitivity.In addition, the second magnet 7 is positioned at immediately below two coil centre positions, and the second magnet 7 is positioned on column 5, and column 5 is fixed on base 2.Each coil is arranged on base 2 by fixed leg 8, and fixed leg 8 is fixed on the sidewall of housing 1 by fixed bar 6 simultaneously.
Above-described embodiment has been described in detail the technical solution of the utility model and beneficial effect; be understood that and the foregoing is only specific embodiment of the utility model; be not limited to the utility model; all any amendments and improvement etc. made in spirit of the present utility model, all should be included within protection domain of the present utility model.
Claims (9)
1. a piezomagnetic strain gauge, is characterized in that: comprise support housing, the stress bearing object be connected with support housing outside, and is positioned at first magnet with magnetostriction of support housing inside;
In support housing, the part be connected with stress bearing object is pressure-bearing part, and pressure bearing body is positioned at the outer wall of pressure-bearing part;
First magnet two ends are fixedly connected with the inwall of pressure-bearing part, or the first magnet two ends are fixedly connected with by the inwall of connector with pressure-bearing part;
During duty, extraneous effect of stress is on stress bearing object, and pressure-bearing part is subject to compressive stress and deformation occurs, and the deformation of this pressure-bearing part weakens towards periphery centered by the position be connected with stress bearing object; The deformation of described pressure-bearing part causes the first magnet generation deformation, and the deformation of this first magnet causes the magnetic of the first magnet to change, and the impedance of this first magnet changes thereupon, exports this impedance by the conductor be connected with the first magnet two ends.
2. piezomagnetic strain gauge as claimed in claim 1, is characterized in that: also comprise the second magnet for providing bias magnetic field for the first magnet.
3. piezomagnetic strain gauge as claimed in claim 1, is characterized in that: described connector is two fixed blocks being connected to pressure-bearing internal partial wall;
Adopt securing member to be fixedly connected with one of them fixed block one end of the first magnet, adopt securing member to be fixedly connected with another fixed block by the other end of the first magnet;
Or each fixed block arranges jack, one end of the first magnet is inserted in the jack of one of them fixed block, and the other end of the first magnet inserts in the jack of another fixed block;
Or each fixed block arranges jack, one end of the first magnet is inserted in the jack of one of them fixed block, and the other end of the first magnet inserts in the jack of another fixed block, and the magnetic core end in each fixed block fixed by employing securing member simultaneously.
4. the piezomagnetic strain gauge as described in claim arbitrary in claims 1 to 3, is characterized in that: also comprise at least one coil, and the first described magnet is through each coil inside;
The magnetic change of described first magnet causes coil impedance to change, and exports this coil impedance by coil two ends.
5. piezomagnetic strain gauge as claimed in claim 4, it is characterized in that: described coil count is greater than or equal to two, there is spacing between adjacent coil, each coils connected in series together.
6. piezomagnetic strain gauge as claimed in claim 4, it is characterized in that: also comprise at least one power conductor, this power conductor one end is fixedly connected with the inwall of pressure-bearing part, and the other end is fixedly connected on the position between the two ends of the first magnet.
7. piezomagnetic strain gauge as claimed in claim 6, is characterized in that: described coil is positioned on support.
8. the piezomagnetic strain gauge as described in claim arbitrary in claims 1 to 3, described piezomagnetic strain gauge, is characterized in that: described conductor is connected with electric impedance analyzer; Or described conductor and resistance form wheatstone bridge configuration, and conductor is a brachium pontis of Wheatstone bridge, and the output of Wheatstone bridge is connected with voltage table, reometer or electric impedance analyzer.
9. piezomagnetic strain gauge as claimed in claim 4, is characterized in that: described coil two ends are connected with electric impedance analyzer; Or described coil two ends and resistance form wheatstone bridge configuration, and conductor is a brachium pontis of Wheatstone bridge, and the output of Wheatstone bridge is connected with voltage table, reometer or electric impedance analyzer.
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| CN201520132555.1U CN204575225U (en) | 2015-03-09 | 2015-03-09 | A kind of piezomagnetic strain gauge |
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| CN201520132555.1U CN204575225U (en) | 2015-03-09 | 2015-03-09 | A kind of piezomagnetic strain gauge |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104697677A (en) * | 2015-03-09 | 2015-06-10 | 中国科学院宁波材料技术与工程研究所 | Piezomagnetic stress sensor |
| CN113534024A (en) * | 2021-06-29 | 2021-10-22 | 浙江英洛华引力科技有限公司 | Magnetic force detection device for magnet |
-
2015
- 2015-03-09 CN CN201520132555.1U patent/CN204575225U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104697677A (en) * | 2015-03-09 | 2015-06-10 | 中国科学院宁波材料技术与工程研究所 | Piezomagnetic stress sensor |
| CN113534024A (en) * | 2021-06-29 | 2021-10-22 | 浙江英洛华引力科技有限公司 | Magnetic force detection device for magnet |
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