CN113267237A - Magnetoelectric composite material detection device of magnetostrictive liquid level meter - Google Patents
Magnetoelectric composite material detection device of magnetostrictive liquid level meter Download PDFInfo
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- CN113267237A CN113267237A CN202110387244.XA CN202110387244A CN113267237A CN 113267237 A CN113267237 A CN 113267237A CN 202110387244 A CN202110387244 A CN 202110387244A CN 113267237 A CN113267237 A CN 113267237A
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- 239000002131 composite material Substances 0.000 title claims abstract description 110
- 238000001514 detection method Methods 0.000 title claims abstract description 28
- 239000007788 liquid Substances 0.000 title claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 69
- 239000003822 epoxy resin Substances 0.000 claims description 7
- 229920000647 polyepoxide Polymers 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 230000010287 polarization Effects 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 7
- 230000002238 attenuated effect Effects 0.000 abstract description 2
- 238000006073 displacement reaction Methods 0.000 description 7
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 6
- 230000006698 induction Effects 0.000 description 4
- 230000005284 excitation Effects 0.000 description 3
- 238000013016 damping Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000002366 time-of-flight method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
- G01F23/56—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats using elements rigidly fixed to, and rectilinearly moving with, the floats as transmission elements
- G01F23/62—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats using elements rigidly fixed to, and rectilinearly moving with, the floats as transmission elements using magnetically actuated indicating means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
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- General Physics & Mathematics (AREA)
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Abstract
The invention discloses a magnetoelectric detection device of a magnetostrictive liquid level meter. The permanent magnet comprises two magnetoelectric composite materials and two permanent magnets; the permanent magnet provides a bias magnetic field for the magnetoelectric composite material, one end of the first magnetoelectric composite material and one end of the second magnetoelectric composite material are respectively fixed on a horizontal tangent of the outer circumference of the waveguide wire, and the first magnetoelectric composite material and the second magnetoelectric composite material are symmetrical about the center of a circle; the first permanent magnet is arranged above the other end of the first magnetoelectric composite material in parallel, and the second permanent magnet is arranged below the other end of the second magnetoelectric composite material in parallel. The invention directly converts the vibration signal into the electric signal through the piezoelectric effect, has higher conversion efficiency, and can regulate and control the resonance frequency of the magnetoelectric composite material to be close to the vibration frequency of the torsional wave through the bias magnetic field, thereby increasing the output voltage of the piezoelectric material, improving the detection capability of the detection device on the weak echo signal attenuated by a long distance, and further increasing the effective range of the magnetostrictive liquid level meter.
Description
Technical Field
The invention relates to the field of detection of liquid level meters, in particular to a magnetoelectric composite material detection device of a magnetostrictive liquid level meter.
Background
The magnetostrictive liquid level meter is a non-contact sensor for measuring the absolute position of a floater by utilizing the magnetostrictive effect, and is widely applied to the industrial fields with severe conditions, such as an oil storage tank, a sewage tank, a chemical reaction kettle and the like, due to the advantages of high precision, long service life, reliability, stability and the like.
The magnetostrictive liquid level meter mainly comprises a floater, a waveguide wire, a detection coil and a signal processing unit. The float is positioned at a liquid-gas interface, and a permanent magnet is arranged in the float and used for forming a static axial magnetic field inside the waveguide wire. When the wave guide wire normally works, current pulses are firstly introduced into the wave guide wire, so that an instantaneous circumferential magnetic field is formed on the wave guide wire, and after the instantaneous circumferential magnetic field is superposed with an axial magnetic field existing in the wave guide wire, torsion waves are formed in the wave guide wire near the floater and are transmitted to two ends at a certain speed according to the Wedgeman effect. The torsional wave reaches the detection device after a period of time, so that the stress in the magnetostrictive strip is changed, the magnetic induction intensity inside the strip is changed along with the change of the stress according to the Villari effect, and at the moment, the induction coil penetrating through the strip generates a voltage signal. The signal is input into a signal processing unit, amplified and filtered, and then shaped into square wave pulses according to a fixed threshold value. And finally, calculating the height of the liquid level by the product of the propagation time and the wave speed of the torsional wave.
From the above principle, it can be known that the detection of guided wave signals by using the Villari effect will undergo two energy conversion processes, i.e., conversion from mechanical energy to magnetic energy and conversion from magnetic energy to electrical energy. For a wide-range application occasion, such as a large oil storage tank with the height of 20m, the attenuation of the torsional wave intensity is large after the torsional wave intensity is propagated for a long distance, and at the moment, the voltage signal generated in the induction coil after the torsional wave intensity passes through the two conversion processes is weak, the signal-to-noise ratio is low, and the subsequent signal processing and time measurement are not facilitated.
Disclosure of Invention
The invention provides a magnetoelectric detection device of a magnetostrictive liquid level meter, aiming at solving the problem that the effective measuring range of the liquid level meter is limited due to the insufficient detection capability of the current detection device on weak echo signals.
In order to realize the purpose, the invention adopts the following technical scheme:
the invention comprises a first magnetoelectric composite material, a second magnetoelectric composite material, a first permanent magnet and a second permanent magnet;
the first magnetoelectric composite material and the second magnetoelectric composite material are horizontally arranged in parallel and are respectively arranged on two sides of the waveguide wire in a point symmetry manner by taking the center of the waveguide wire as a circle center, and one ends of the first magnetoelectric composite material and the second magnetoelectric composite material, which are close to the waveguide wire, are respectively fixedly connected to two positions on the outer circumference of the waveguide wire in a circle symmetry manner; a connecting line between one end of the first magnetoelectric composite material contacted with the waveguide wire and one end of the second magnetoelectric composite material contacted with the waveguide wire is a vertical diameter passing through the center of the waveguide wire and along the gravity direction;
a first permanent magnet is arranged above the other end of the first magnetoelectric composite material which is not connected with the waveguide wire in parallel, a second permanent magnet is arranged below the other end of the second magnetoelectric composite material which is not connected with the waveguide wire in parallel, and the first magnetoelectric composite material and the second magnetoelectric composite material are both electrically connected to an external signal processing unit; and the other end of the first magnetoelectric composite material which is not connected with the waveguide wire and the other end of the second magnetoelectric composite material which is not connected with the waveguide wire are connected to an external signal processing unit according to a differential structure.
The first magnetoelectric composite material and the second magnetoelectric composite material are both of two-phase laminated structures and both comprise piezoelectric materials and magnetostrictive materials, the piezoelectric materials are connected with the magnetostrictive materials through epoxy resin, one end of the magnetostrictive material close to the waveguide wire is fixed on the outer circumference of the waveguide wire along the radial direction of the waveguide wire, and the piezoelectric materials are fixedly bonded on the other end of the magnetostrictive material far away from the waveguide wire through the epoxy resin; the first permanent magnets are arranged in parallel right above the piezoelectric material of the first magnetoelectric composite material and are arranged at intervals; the second permanent magnets are arranged in parallel under the piezoelectric material of the second magnetoelectric composite material and are arranged at intervals.
The piezoelectric material of the first magnetoelectric composite material and the piezoelectric material of the second magnetoelectric composite material keep the same polarization direction when being respectively bonded to the magnetostrictive material, and the output end of the piezoelectric material of the first magnetoelectric composite material and the output end of the piezoelectric material of the second magnetoelectric composite material are connected according to a differential structure and then output to an external signal processing unit for processing.
The magnetostriction coefficients and Young modulus of the magnetostriction materials of the first magnetoelectric composite material and the second magnetoelectric composite material are the same, and the piezoelectric constants and the elastic constants of the piezoelectric materials of the first magnetoelectric composite material and the second magnetoelectric composite material are the same. Such that the first magnetoelectric composite material and the second magnetoelectric composite material have the same characteristic parameters.
The output end of the piezoelectric material is arranged on the side surface of the piezoelectric material far away from one end of the waveguide wire.
The magnetic pole directions of the first permanent magnet and the second permanent magnet are parallel and the magnetic pole arrangement is opposite. Specifically, the N pole ends of the first permanent magnet and the second permanent magnet may face a direction close to the waveguide wire or a direction away from the waveguide wire, and the S pole ends of the first permanent magnet and the second permanent magnet may face a direction away from the waveguide wire or a direction close to the waveguide wire.
The magnetostrictive material is fixedly connected with the waveguide wire through a spot welding process.
The invention adjusts the resonance frequency of the magnetoelectric composite material through the bias magnetic field provided by the permanent magnet, and places two pieces of piezoelectric materials with the same polarity to form a differential output mode, thereby effectively improving the detection capability of the detection device on weak echo signals and improving the signal-to-noise ratio of output voltage signals.
The invention has the beneficial effects that:
compare in converting the guided wave signal into voltage signal through induction coil, use magnetoelectric composite's advantage:
(1) through the piezoelectric effect, directly convert vibration signal into the signal of telecommunication, conversion efficiency is higher.
(2) The resonance frequency of the magnetoelectric composite material can be regulated and controlled by the bias magnetic field to be close to the vibration frequency of the torsional wave, so that the output voltage of the piezoelectric material is increased, the detection capability of the detection device on weak echo signals attenuated by a long distance is improved, and the effective range of the magnetostrictive liquid level meter can be increased.
Drawings
FIG. 1 is a schematic structural diagram of a magneto-electric detection device;
FIG. 2 is a schematic view of a liquid level meter employing a magnetoelectric detection device;
FIG. 3 is a schematic diagram of the structure of the magnetoelectric detection device connected with the signal processing unit;
fig. 4 shows a structure of a magnetoelectric composite material.
In the figure, 1-a first magnetoelectric composite material, 2-a first permanent magnet, 3-a waveguide wire, 4-a second permanent magnet, 5-a damping element, 6-a floater, 7-a current-limiting resistor, 8-a power supply, 9-a pulse excitation unit, 10-a lead, 11-a piezoelectric material, 12-epoxy resin, 13-a magnetostrictive material and 14-a first magnetoelectric composite material.
Detailed Description
In order to clearly illustrate the objects, features and advantages of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described and thus the scope of the present invention is not limited by the specific implementation set forth below.
As shown in fig. 1, the present invention includes a first magnetoelectric composite material 1, a second magnetoelectric composite material 14, a first permanent magnet 2, and a second permanent magnet 4; the first magnetoelectric composite material 1 and the second magnetoelectric composite material 14 are horizontally arranged in parallel and are respectively arranged on two sides of the waveguide wire 3 in a point symmetry manner by taking the center of the waveguide wire 3 as a circle center, and one ends of the first magnetoelectric composite material 1 and the second magnetoelectric composite material 14 close to the waveguide wire 3 are respectively fixedly connected to two symmetrical positions of the outer circumference of the waveguide wire 3 by the circle center; a connecting line between one end of the first magnetoelectric composite material 1 in contact with the waveguide wire 3 and one end of the second magnetoelectric composite material 14 in contact with the waveguide wire 3 is a vertical diameter passing through the center of the waveguide wire 3 and along the gravity direction;
a first permanent magnet 2 is arranged in parallel above the other end of a first magnetoelectric composite material 1 which is not connected with the waveguide wire 3, a second permanent magnet 4 is arranged in parallel below the other end of a second magnetoelectric composite material 14 which is not connected with the waveguide wire 3, and the first magnetoelectric composite material 1 and the second magnetoelectric composite material 14 are both electrically connected to an external signal processing unit; and the other end of the first magnetoelectric composite material 1 which is not connected with the waveguide wire 3 and the other end of the second magnetoelectric composite material 14 which is not connected with the waveguide wire 3 are connected to an external signal processing unit in a differential structure.
As shown in fig. 1 and 4, both the first magnetoelectric composite material 1 and the second magnetoelectric composite material 14 are of a two-phase laminated structure, and both include a piezoelectric material 11 and a magnetostrictive material 13, the piezoelectric material 11 is connected with the magnetostrictive material 13 through an epoxy resin 12, one end of the magnetostrictive material 13 close to the waveguide wire 3 is fixed on the outer circumference of the waveguide wire 3 along the radial direction of the waveguide wire 3, and the specifically implemented magnetostrictive material 13 is fixedly connected with the waveguide wire 3 through a spot welding process. The piezoelectric material 11 is fixedly bonded to the other end of the magnetostrictive material 13 far away from the waveguide wire 3 through the epoxy resin 12; the first permanent magnets 2 are arranged in parallel and at intervals right above the piezoelectric material 11 of the first magnetoelectric composite material 1; the second permanent magnets 4 are arranged in parallel and spaced apart directly below the piezoelectric material 11 of the second magnetoelectric composite material 14.
As shown in fig. 1 and 2, the first permanent magnet 2 and the second permanent magnet 4 have magnetic poles in parallel and opposite directions. Specifically, the N pole ends of the first permanent magnet 2 and the second permanent magnet 4 may face a direction close to the waveguide wire 3 or a direction away from the waveguide wire 3, and the S pole ends of the first permanent magnet 2 and the second permanent magnet 4 may face a direction away from the waveguide wire 3 or a direction close to the waveguide wire 3.
The magnetostriction coefficients and Young's moduli of the magnetostriction materials 13 of the first magnetoelectric composite material 1 and the second magnetoelectric composite material 14 are the same, and the piezoelectric constants and elastic constants of the piezoelectric materials 11 of the first magnetoelectric composite material 1 and the second magnetoelectric composite material 14 are the same, so that the first magnetoelectric composite material 1 and the second magnetoelectric composite material 14 have the same characteristic parameters.
The polarization direction of the piezoelectric material 11 adhered to the magnetostrictive material 13 in the first magnetoelectric composite material 1 is the same as the polarization direction of the piezoelectric material 11 adhered to the magnetostrictive material 13 in the second magnetoelectric composite material 14; and the output end of the piezoelectric material 11 of the first magnetoelectric composite material 1 and the output end of the piezoelectric material 11 of the second magnetoelectric composite material 14 are connected according to a differential structure and then output to an external signal processing unit for processing, and the output end of the piezoelectric material 11 is arranged on the side surface of the piezoelectric material 11 far away from one end of the waveguide wire 3.
The implementation working process of the invention comprises the following steps:
as shown in fig. 2, the first permanent magnet 2 and the second permanent magnet 4 respectively provide a bias magnetic field of a certain magnitude for the first magnetoelectric composite material 1 and the second magnetoelectric composite material 14, and the resonance frequency of the first magnetoelectric composite material 1 and the second magnetoelectric composite material 14 is adjusted to be the same as or close to the mass point vibration frequency caused by the torsional wave, so that the voltage signal output by the piezoelectric material 1 in the first magnetoelectric composite material 1 and the second magnetoelectric composite material 14 when the magnetostrictive material 13 vibrates is enhanced.
As shown in fig. 3, the waveguide filament 3, the current limiting resistor 7, the power supply 8, the pulse excitation unit 9 and the conducting wire 10 together form a current loop, when measuring the liquid level, firstly, the pulse excitation unit 9 generates a square wave signal with a certain pulse width, the square wave signal is loaded into the waveguide filament 3 through the conducting wire 10 and forms a circumferential magnetic field near the surface thereof, according to widemann effect, when the circumferential magnetic field generated by the waveguide filament 3 is instantaneously superposed with an axial magnetic field formed by a permanent magnet inside the float 6 in the waveguide filament 3, the surface of the waveguide filament 3 is torsionally deformed and thus excites a torsional wave, the torsional wave propagates to both ends of the waveguide filament 3 at a certain speed, when the torsional wave reaches the first magnetoelectric composite material 1 and the second composite material 14, the direction causing the vibration displacement inside the magnetostrictive material 13 of the first magnetoelectric composite material 1 is opposite to the direction causing the vibration displacement inside the magnetostrictive material 13 of the second magnetoelectric composite material 14, as shown in fig. 1, the waveguide fiber 3 generates clockwise tangential displacement of torsional waves at a certain moment, at this moment, rightward vibration displacement is generated inside the magnetostrictive material 13 of the first magnetoelectric composite material 1, leftward vibration displacement is generated inside the magnetostrictive material 13 of the second magnetoelectric composite material 14, and the leftward vibration displacement is applied to the respective piezoelectric materials 11 through the epoxy resin 12, and because the piezoelectric materials 11 in the first magnetoelectric composite material 1 and the second magnetoelectric composite material 14 are placed in the same polarity, two voltage signals with opposite polarities are output under the action of the respective vibration displacement, and finally, the two voltage signals are further amplified through the differential output structure. The signal is input to a signal processing unit, and after amplification, filtering and shaping, the propagation time of the torsional wave can be determined according to the start pulse and the end pulse, so that the absolute position of the float 6 can be calculated according to the TOF method. For the torsional wave reaching the end of the waveguide wire 3, most of its energy is absorbed by the damping element 5, thereby reducing the interference of the end-reflected wave on the detection signal.
Claims (7)
1. The utility model provides a magnetic electricity detection device of magnetostrictive liquid level meter which characterized in that: the permanent magnet comprises a first magnetoelectric composite material (1), a second magnetoelectric composite material (14), a first permanent magnet (2) and a second permanent magnet (4);
the first magnetoelectric composite material (1) and the second magnetoelectric composite material (14) are horizontally arranged in parallel and are respectively arranged on two sides of the waveguide wire (3) in a point symmetry manner by taking the center of the waveguide wire (3) as a circle center, and one ends of the first magnetoelectric composite material (1) and the second magnetoelectric composite material (14) close to the waveguide wire (3) are respectively fixedly connected to two positions symmetrical with the circle center on the outer circumference of the waveguide wire (3);
the first permanent magnet (2) is placed in parallel above the other end of the first magnetoelectric composite material (1), the second permanent magnet (4) is arranged in parallel below the other end of the second magnetoelectric composite material (14), and the first magnetoelectric composite material (1) and the second magnetoelectric composite material (14) are electrically connected to an external signal processing unit.
2. The magnetoelectric detection device of the magnetostrictive liquid level meter according to claim 1, characterized in that: the first magnetoelectric composite material (1) and the second magnetoelectric composite material (14) are both of two-phase laminated structures and respectively comprise a piezoelectric material (11) and a magnetostrictive material (13), one end of the magnetostrictive material (13) close to the waveguide wire (3) is fixed on the outer circumference of the waveguide wire (3) along the radial direction of the waveguide wire (3), and the piezoelectric material (11) is fixedly bonded on the other end of the magnetostrictive material (13) far away from the waveguide wire (3) through epoxy resin (12); the first permanent magnet (2) is arranged in parallel right above the piezoelectric material (11) of the first magnetoelectric composite material (1); the second permanent magnet (4) is arranged in parallel just below the piezoelectric material (11) of the second magnetoelectric composite material (14).
3. The magnetoelectric detection device of the magnetostrictive liquid level meter according to claim 1, characterized in that: the piezoelectric material (11) in the first magnetoelectric composite material (1) and the piezoelectric material (11) in the second magnetoelectric composite material (14) keep the same polarization direction when being respectively bonded to the magnetostrictive material (13), and the output end of the piezoelectric material (11) in the first magnetoelectric composite material (1) and the output end of the piezoelectric material (11) in the second magnetoelectric composite material (14) are connected according to a difference structure and then output to an external signal processing unit.
4. A magneto-electric detection arrangement for a magnetostrictive liquid level gauge according to claim 3, characterized in that: the magnetostriction coefficient and Young modulus of the magnetostriction material (13) of the first magnetoelectric composite material (1) and the second magnetoelectric composite material (14) are the same, and the piezoelectric constant and the elastic constant of the piezoelectric material (11) of the first magnetoelectric composite material (1) and the second magnetoelectric composite material (14) are the same.
5. A magneto-electric detection arrangement for a magnetostrictive liquid level gauge according to claim 3, characterized in that: the output end of the piezoelectric material (11) is arranged on the side surface of the piezoelectric material (11) far away from one end of the waveguide wire (3).
6. The magnetoelectric detection device of the magnetostrictive liquid level meter according to claim 1, characterized in that: the magnetic pole directions of the first permanent magnet (2) and the second permanent magnet (4) are parallel and the magnetic pole arrangement is opposite.
7. The magnetoelectric detection device of the magnetostrictive liquid level meter according to claim 1, characterized in that: the magnetostrictive material (13) is fixedly connected with the waveguide wire (3) through a spot welding process.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220128393A1 (en) * | 2019-01-17 | 2022-04-28 | Beijing Connetech Electronics Technology Co., Ltd. | Magnetostrictive liquid level meter and liquid level measurement method thereof |
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