CN103364054B - A kind of signal follower method and device improving magnetic striction wave guide range hole - Google Patents
A kind of signal follower method and device improving magnetic striction wave guide range hole Download PDFInfo
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- CN103364054B CN103364054B CN201310284699.4A CN201310284699A CN103364054B CN 103364054 B CN103364054 B CN 103364054B CN 201310284699 A CN201310284699 A CN 201310284699A CN 103364054 B CN103364054 B CN 103364054B
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Abstract
The invention discloses a kind of the signal follower method and the device that improve magnetic striction wave guide range hole, the conductor related to connects by dominating ripple silk and secondary guided wave silk form by being connected wire, leading ripple silk runs the electromagnetic signal and the guided wave signals that there are excitation electric pulses generation, the composite signal be made up of this electromagnetic signal and guided wave signals the coil collection be placed on leading ripple silk; Composite signal is by connecting wire transmission to secondary guided wave silk, reflection through connection wire two ends with the phase contact of major and minor guided wave silk in transmitting procedure, attenuate the guided wave signals in composite signal, make that secondary guided wave silk only has electromagnetic signal, gather electromagnetic signal by the coil be placed on secondary guided wave silk; Do calculus of differences with filtering electromagnetic signal to composite signal and electromagnetic signal, calculus of differences result is the signal after the improvement of blind area.The present invention extracts two groups of signals of different nature respectively, then by signal differential process filtering electromagnetic signal, effectively reduce check frequency, enlarge measurement range.
Description
Technical field
The present invention relates to magnetic striction wave guide position measurement technique field, specifically a kind of signal follower method and device improving magnetic striction wave guide range hole.
Background technology
Elastic wave pulse is propagated along waveguide, produces a voltage in ferromagnetic conductor magnetic field position, this phenomenon very early know by people (Hristoforou, E.; Niarchos, D.A coilymagnetostrictive delay line arrangement for sensing applications.Sensors andActuators A 91 (2001) 91-94).On the contrary, if the interior propagation of conductor is electric pulse, when this pulse and magnetic field interaction time, will there will be a torsional effect, this phenomenon is generally referred to as wiedemann effect (A.F.Cobeno; A.Zhukov.Air-flux magnetoelastic sensor basedon inverse Wiedemann effect of amorphous ribbon.Sensors and Actuators A 106 (2003) 174 – 178).Up to now, as long as measurement mechanism uses the modal transducer based on wiedemann effect to produce elasticity of torsion wave impulse in one end (the variable position place of permanent magnet) of guided wave silk consciously, its position just determine by consequent electric pulse.Although elastic wave pulse both can be longitudinal mode state also can be torsion mode, this depends on the sensor unit producing pulse.For the magneto strictive sensor adopting the pulse of longitudinal mode state, be convenient to build.But much more superior than longitudinal mode state of the propagation characteristic of torsional pulses, therefore, in practical application, adopt reverses guided wave silk more.Also because existingly so-calledly longitudinal mode state pulses switch can be become torsional pulses, the torsion mode of this prioritizing selection lag line is also because encouraged further to use.
More particularly, along the interaction of the elastic wave pulse permanent magnetic field relevant with permanent magnet that guided wave silk is propagated, a potential pulse is produced in ferromagnetism guided wave silk, because sound pulse propagates with fixing speed, this speed dependent in the modulus of shearing of guided wave silk and density, so this pulse can be used to the distance between ranging pulse selector and variable permanent magnet.
Usually, guided wave silk need be placed in the protecting pipe of hollow, encapsulates, be fixed afterwards, then be connected with tested moving member by position indicator pointer together with excitation and post processing circuitry.Such as in the monitoring of storage tank oil level, magnetostriction position transducer is used to the liquid volume change determined in the cavity in fixed measure.Float be arranged on liquid top and around or be sidelong in the waveguide pipe of hollow.Float carries circle pointer, and the magnetic field interaction produced in its static magnetic field produced and wire, motivates elastic wave and be received transducer and convert electric signal to, determine the position of float relative datum with this.
Driving pulse produces electromagnetic signal in receiving coil, and elasticity of torsion ripple produces position signalling in coil.The amplitude of electromagnetic signal and duration of oscillation scope are much larger than guided wave signals.And electromagnetic signal position maintains static, and guided wave signals changes along with the movement of position magnet.When two signal distances are far away, signal is clear and legible.When guided wave signals is with time initially close, guided wave signals will flood by electromagnetic signal, to guided wave signals (namely identification is carried out in the position of magnet), measurement blind area cannot be formed thus.This phenomenon determines the minimum range of magnetostriction position transducer.Reduce for this reason or eliminate check frequency, extremely important concerning improving magnetostriction position transducer performance.If the blind area of this sensor is 500mm, so when oil level detection, the oil level bottom storage tank within the scope of 500mm all cannot the real time measure, and the oil volume in whole storage tank also cannot record.So research and development improve the pick-up unit of magnetostriction position transducer blind area, have a wide range of applications market, very high practical value, economic worth and social benefit.
Traditional method adopts mimic channel, reduced in receiving transducer because the duration of oscillation of driving pulse generation by impedance matching.This method directly, effectively.But can not dead zone-eliminating completely, and what is more important treatment circuit is complicated, when product manufacturing, needs each parts, each parameter is consistent as much as possible, such as guided wave filament length degree, diameter, conductivity, magnetostrictivity, the necessary strict conformance of coil impedance etc. factor, otherwise the parameter of match circuit needs to adjust thereupon, this considerably increases cost is manufacture the complexity safeguarded, maintainability is poor, and assembling and setting operation inconvenience, reliability is low.
Summary of the invention
The object of the present invention is to provide a kind of method and apparatus improving magnetostriction position transducer check frequency scope, it effectively reduces check frequency, expands measurement range.
Improve a signal follower method for magnetic striction wave guide range hole, the conductor related to connects by dominating ripple silk and secondary guided wave silk form by being connected wire, and the method is specially:
(1) signal driving source produces excitation electric pulse;
(2) leading ripple silk runs the electromagnetic signal and the guided wave signals that there are excitation electric pulses generation, gather the composite signal be made up of this electromagnetic signal and guided wave signals;
(3) composite signal is by connecting wire transmission to secondary guided wave silk, reflection through connection wire two ends with the phase contact of major and minor guided wave silk in transmitting procedure, attenuate the guided wave signals in composite signal, make that secondary guided wave silk only has electromagnetic signal, gather the electromagnetic signal of secondary guided wave silk;
(4) do calculus of differences with filtering electromagnetic signal to the composite signal gathered and electromagnetic signal, calculus of differences result is the signal after the improvement of blind area.
Further, comprise combined type conductor, main coil and follow coil, combined type conductor comprises leading ripple silk, connects wire and secondary guided wave silk, and leading ripple silk connects with secondary guided wave silk by connecting wire, main coil is placed on leading ripple silk, follows coil and is placed on secondary guided wave silk; Main coil is for gathering the composite signal be made up of the electromagnetic signal of excitation electric pulses generation and guided wave signals, connect wire to be used for by the reflection of its two ends with the phase contact of major and minor guided wave silk, attenuate the guided wave signals in composite signal, making that secondary guided wave silk only has electromagnetic signal, following coil for gathering the electromagnetic signal on secondary guided wave silk.
Further, described major and minor guided wave silk adopts strong Magnetostriction material, and described connection wire adopts the weak Magnetostriction material of strong electric conductivity.
Further, between described major and minor guided wave silk by one section connect wire connect or by multistage connect wire be alternately connected with multistage guided wave silk after connect again.
In general, the above technical scheme conceived by the present invention compared with prior art, the signal transmission line consisted of combined type conductor due to the present invention filters characteristics of signals and screens, recycle main coil afterwards and follow the signal that coil extracts screening front and back respectively, the electromagnetic signal through difference processing filtering again, effectively reduce check frequency, and then reach the object expanding measurement range.
Accompanying drawing explanation
Fig. 1 is traditional magnetic striction wave guide position transducer fundamental diagram;
Fig. 2 is traditional magnetic striction wave guide position transducer blind area schematic diagram;
Fig. 3 is twin coil composite conductor structural drawing of the present invention;
Fig. 4 is twin coil composite conductor structure blind area of the present invention overhaul flow chart;
Fig. 5 is coherent signal schematic diagram in example of the present invention, wherein, original signal 1 schematic diagram that Fig. 5 (a) is example of the present invention, original signal 2 schematic diagram that Fig. 5 (b) is example of the present invention, Fig. 5 (c) is the composite signal after the improvement of blind area.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each embodiment of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
The present invention forms a kind of signal and follows compensation method on the basis of blind area mechanism of production, and the method extracts two groups of signals of different nature respectively by two coils, then is calculated the check frequency reducing magnetostriction position transducer by two signal differentials.
The method obtaining signal has two kinds:
First method is: within the first job cycle, records an electromagnetic signal as standard.Composite signal is deducted this electromagnetic signal, obtain guided wave signals.But electromagnetic signal that this method obtains is because be some time points (moment), so when noise enter, the factor such as guided wave silk and coil position change electromagnetic signal is changed time, tracer signal and change after signal inconsistent, will distortion be produced.In brief, this method cannot the random fluctuation such as stress release treatment.
Second method is: Real-time Obtaining electromagnetic signal.For this reason, the present invention devises a kind of twin coil, multistage conductor means.As shown in Figure 3.This structure has two features: extract composite signal and electromagnetic signal respectively by two coils.In each cycle, main coil 20 real-time reception composite signal, follows coil real-time reception electromagnetic signal 13, does Difference Calculation in real time and obtains guided wave signals.Multistage conductor is made up of three parts, is leading ripple silk respectively, connects wire, secondary guided wave silk.On leading ripple silk, cover has main coil, and on secondary guided wave silk, coil followed by cover.Connect two nodes that wire two ends are connected with major and minor guided wave silk, can decay guided wave can the propagation of (mechanical energy), and by the propagation of electromagnetic energy, in brief, selective filter can be carried out to electromagnetic energy and mechanical energy, follow coil Real-time Obtaining electromagnetic wave signal.Major and minor guided wave silk adopts the material that Magnetostriction is good, such as iron-nickel alloy; Connect wire and adopt good conductivity and the weak material of Magnetostriction, such as copper, aluminium.Connecting wire easily extensible is the mode that connection wire is alternately connected with secondary guided wave silk, and such tie point increases, and guided wave is decayed more obvious.
By contrast, second method has good noise inhibiting ability.Composite signal because counter magnetostriction effect produces transient magnetic field, is obtained by the first coil in guided wave silk.Torsional wave produces reflection and transmission at two Nodes, chooses suitable material and connected mode, can control the ratio of reflection and transmission.If transmissivity is n%, so guided wave passes to the n2% that the amount of secondary guided wave silk is original torsional wave.Therefore it will reduce greatly following the guided wave signals that coil produces.If ignore the signal that this part guided wave produces, so can think and follow the just initial excitation signal that coil receives.
Based on above-mentioned principle, the signal follower method improving magnetostriction position transducer check frequency provided by the invention, its step comprises:
The first step, signal driving source provides excitation electric pulse to compound guided wave system.
Second step, leading ripple silk runs the electromagnetic signal 13 and the guided wave signals 14 that there are excitation electric pulses generation, and main coil obtains the composite signal comprising electromagnetic signal and guided wave signals.Two signals all present, see Fig. 5 (a) with the form of transient state.
3rd step, through connecting two secondary reflections of wire two end node, attenuating guided wave mechanical energy, secondary guided wave silk only having electromagnetic signal 13, follows coil and only obtain electromagnetic signal, see Fig. 5 (b).
4th step, two signals obtained by two coils send into disposal system, calculus of differences, reduce the fluctuation of electromagnetic signal, thus reduce blind area.
5th step, enters next cycle.
Below in conjunction with accompanying drawing and example, apparatus of the present invention are further described in detail.
Fig. 1 is traditional magnetic striction wave guide position transducer fundamental diagram.Position indicator pointer 6 produces stationary magnetic field 22 in guided wave silk 4, and signal source 9 sends electrical excitation pulse 1 in guided wave silk system, and produce cyclic motion magnetic field 5, this magnetic field and stationary magnetic field 22 interact, and produces elasticity of torsion ripple 7.This elastic wave 7 is propagated along guided wave silk 4 to two ends, and received transducer 3 converts electric signal to and outputs in signal processing system.In addition, power supply 10 provides power for system, and adjustable resistance 11 is for regulating size of current.Stay pipe 15 provides support and guiding for guided wave silk 1.
The signal that traditional magnetic striction wave guide position transducer produces as shown in Figure 2.Be the signal oscillating that driving pulse 1 produces in receiving transducer 3 on the left of Fig. 2, vibration interval 12 is blanking length.Right side is the signal that the elasticity of torsion ripple 7 representing position indicator pointer 6 produces in receiving transducer 3.When pointer 6 and transducer 7 very near time, energized signal 13 flooded by guided wave signals 14, and cannot carry out identification to pointer 6 position.
Fig. 3 is the twin coil composite guide body structure after improving.This structure has two obvious features: combined type conductor and twin coil.
Combined type conductor is made up of three parts, leading ripple silk 17, connection wire 18, secondary guided wave silk 19.If consider loop line 8 again, then whole electromagnetic circuit system is made up of four parts.The electromagnetic circuit of traditional magnetostriction position transducer then only has guided wave silk 4 and wire 8 two parts.The effect of leading ripple silk 17 is here equal to the guided wave silk 4 in traditional magnetostriction position transducer.The effect connecting wire 18 is by electromagnetic energy, but it carries out twice reflection loss with two nodes of two ends guided wave silk to the mechanical energy of elastic wave 7.The elasticity of torsion ripple 7 being passed to secondary guided wave silk 19 so just reduces greatly.The electromagnetic signal 13 of following the just driving pulse 1 that coil 21 obtains on it can be guaranteed like this, and there is no the signal of elastic wave 7.
The present invention adopts twin coil to obtain signal, and wherein main coil 20 obtains electrical excitation pulse 1 on leading ripple silk 17, and this signal comprises electromagnetic field signal 13 that electrical excitation pulse 1 causes and the transient magnetic field signal 14 that guided wave 7 causes; Follow coil 21 and obtain electromagnetic signal 2 on secondary guided wave silk 19, this signal only comprises the electromagnetic field signal 13 that driving pulse 1 causes, and a small amount of guided wave transient magnetic field signal 14, the regulative mode change that can connect wire 18 material and two nodes by centre suppresses the size of the latter.Protecting pipe 16 provides insulation protection for guided wave silk 4.
Fig. 4 gives the present invention the concrete implementing procedure improving the method for magnetostriction position transducer blind area.What main coil 20 received is the composite signal comprising electromagnetic signal 13 and guided wave signals 14, what follow that coil 21 receives is only electromagnetic signal 13, does Difference Calculation, filtering electromagnetic signal by ppu to two signals, thus reduce blind area, expand measurement range.
The present invention is not only confined to above-mentioned embodiment; persons skilled in the art are content disclosed in embodiment and accompanying drawing; other multiple embodiment can be adopted to implement the present invention; therefore; every employing project organization of the present invention and thinking; do the design that some simply change or change, all fall into the scope of protection of the invention.
Claims (4)
1. improve a signal follower method for magnetic striction wave guide range hole, the conductor related to connects by dominating ripple silk and secondary guided wave silk form by being connected wire, and the method is specially:
(1) signal driving source produces excitation electric pulse;
(2) leading ripple silk runs the electromagnetic signal and the guided wave signals that there are excitation electric pulses generation, gather the composite signal be made up of this electromagnetic signal and guided wave signals;
(3) composite signal is by connecting wire transmission to secondary guided wave silk, reflection through connection wire two ends with the phase contact of major and minor guided wave silk in transmitting procedure, attenuate the guided wave signals in composite signal, make that secondary guided wave silk only has electromagnetic signal, gather the electromagnetic signal of secondary guided wave silk;
(4) do calculus of differences with filtering electromagnetic signal to the composite signal gathered and electromagnetic signal, calculus of differences result is the signal after the improvement of blind area.
2. one kind is improved the signal following device of magnetic striction wave guide range hole, it is characterized in that, comprise combined type conductor, main coil, follow coil and disposal system, combined type conductor comprises leading ripple silk, connects wire and secondary guided wave silk, leading ripple silk connects with secondary guided wave silk by connecting wire, main coil is placed on leading ripple silk, follows coil and is placed on secondary guided wave silk; Main coil is for gathering the composite signal be made up of the electromagnetic signal of excitation electric pulses generation and guided wave signals, connect wire to be used for by the reflection of its two ends with the phase contact of major and minor guided wave silk, attenuate the guided wave signals in composite signal, make that secondary guided wave silk only has electromagnetic signal, follow coil for gathering the electromagnetic signal on secondary guided wave silk, disposal system is used for carrying out Difference Calculation to reduce blind area to electromagnetic signal.
3. the signal following device improving magnetic striction wave guide range hole according to claim 2, is characterized in that, described major and minor guided wave silk adopts strong Magnetostriction material, and described connection wire adopts the weak Magnetostriction material of strong electric conductivity.
4. the signal following device of the improvement magnetic striction wave guide range hole according to Claims 2 or 3, it is characterized in that, being connected by one section of connection wire between described major and minor guided wave silk or being connected after wire is alternately connected with multistage guided wave silk by multistage is connected again.
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| CN108594311A (en) * | 2018-06-11 | 2018-09-28 | 中国石油天然气集团公司 | A kind of harmonic source detection device and method based on magnetostriction cable |
| CN113267237B (en) * | 2021-04-08 | 2024-05-24 | 国家石油天然气管网集团有限公司华南分公司 | Magneto-electric composite material detection device of magnetostrictive liquid level meter |
| CN113932881B (en) * | 2021-10-15 | 2023-11-10 | 常州市成丰流量仪表有限公司 | Method for measuring and calculating dead zone-free magnetostrictive material level sensor |
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| CN2793705Y (en) * | 2005-05-18 | 2006-07-05 | 徐伟 | Magnetic telescopic level meter |
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| US20110025317A1 (en) * | 2009-07-31 | 2011-02-03 | Electric Power Research Institute, Inc. | MsS PROBE FOR GUIDED-WAVE INSPECTION OF FUEL RODS |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4943773A (en) * | 1987-09-24 | 1990-07-24 | Magnetek Controls | Magnetostrictive linear displacement transducer having preselected zero crossing detector |
| CN2793705Y (en) * | 2005-05-18 | 2006-07-05 | 徐伟 | Magnetic telescopic level meter |
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Effective date of registration: 20211025 Address after: 430000 room 531, 5 / F, building a, overseas talent building, No. 999, Gaoxin Avenue, Donghu New Technology Development Zone, Wuhan, Hubei Province Patentee after: Wuhan Yimu Precision Instrument Co.,Ltd. Address before: 430074 Hubei Province, Wuhan city Hongshan District Luoyu Road No. 1037 Patentee before: HUAZHONG University OF SCIENCE AND TECHNOLOGY |