CN102564364B - Electromagnetic ultrasonic transducer for measuring wall thickness of test piece and method for measuring wall thickness of test piece - Google Patents
Electromagnetic ultrasonic transducer for measuring wall thickness of test piece and method for measuring wall thickness of test piece Download PDFInfo
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Abstract
The invention discloses an electromagnetic ultrasonic transducer for measuring wall thickness of a test piece and a method for measuring the wall thickness of the test piece. The transducer comprises an upper shell, a lower shell which is abutted with the upper shell and comprises a secondary stepped hole at the bottom, an exciting plane coil which is arranged inside the deepest stepped hole at the bottom of the lower shell, a receiving plane coil which is arranged inside the deeper stepped hole at the bottom of the lower shell and coaxially laminated with the exciting plane coil, a shielding layer and a magnet element, which are sequentially arranged on the receiving plane coil, and a joint, which is arranged on the upper shell, respectively connected with the two plane coils through an insulated wire and used for being connected with a thickness meter so as to measure the wall thickness of the test piece. The two plane coils do not interfere with each other in a space so that the transducer has high exciting efficiency, high receiving sensitivity and high signal-to-noise ratio, and simultaneously, reduces a measuring blind zone by arrangement of the designed dual coils and other elements.
Description
Technical field
The invention belongs to the Ultrasonic NDT field, more specifically, relate to a kind of electromagnetic ultrasonic transducer and measuring method thereof of the wall thickness for test specimens such as measurement such as steel pipes.
Background technology
The raising product qualities such as weldless steel tube required along with the user, carry out the requirement of continuous wall thickness measurement to steel pipe etc. in production run more and more urgent, needs a kind of non-contacting wall thickness measuring technology.On the other hand, for ensureing the reliability service of bearing device, its in-service thickness measuring demand is also more and more, needs a kind of thickness measurement technology that is applicable to high temperature.As a kind of method that meets the demand, electromagnetic ultrasonic thickness measuring more and more comes into one's own in practice is used.
Electromagnetic ultrasonic transducer is a kind ofly produce on metal and receive hyperacoustic device, as the sensing element in electromagnetic ultrasonic thickness measuring, is responsible for the conversion of electric signal and ultrasonic signal, and its performance has a direct impact measurement.Electromagnetic ultrasonic transducer mainly consists of coil and permanent magnet or two major parts of electromagnet.Permanent magnet or electromagnet produce a stable bias magnetic field in metal inside, and the drive coil that passes to exchange current can be at the inner generation of test specimen and the same eddy current frequently of electric current.The charged particle moved in metal will be subject to Lorentz force F effect:
F＝J×B
Wherein J is electric eddy current density, and B is biased magnetic field strength.Under the interaction of charged particle and atom, in metal inside, produce ultrasound wave.When ultrasonic propagation arrives the sensitive zones of electromagnetic ultrasonic transducer, due to the effect of bias magnetic field, the vibration meeting produces eddy current in test specimen.Receiving coil is sensed the changes of magnetic field that eddy current produces, and then the output electric signal corresponding with ultrasound wave.
Coil is as the sensitive element of electromagnetic ultrasonic transducer, and its design directly affects the performance of electromagnetic ultrasonic transducer.Drive coil and receiving coil all should be positioned as close to test specimen, can weaken coil away from test specimen and produce and receive the ability of eddy current in test specimen.The design of drive coil should be able to form efficient coupling with test specimen, and can bear high power, to produce high-octane ultrasound wave in test specimen.The design reply changes of magnetic field of receiving coil is very responsive, so that respond to faint signal.Both designing requirements are distinguishing.
A kind of electromagnetic ultrasonic transducer design is to adopt unicoil, it is characterized in that coil is not only for excitation but also for receiving.Due to multiplexing coil, therefore the distance of two coils and test specimen all can drop to minimum, but the requirement that coil need to be taken into account excitation simultaneously and receive, performance can not reach the best.The unicoil electromagnetic ultrasonic transducer need to be used in conjunction with duplicate circuitry simultaneously, stops driving pulse to damage receiving circuit.The reception signal but duplicate circuitry can be decayed, and restricting signal bandwidth.Duplicate circuitry also easily causes vibration in addition, increases and measures blind area.
For evading these problems, another kind of design is to adopt the independently twin coil design of drive coil and receiving coil.Chinese patent CN99118154.9 discloses a kind of improved main bang recovery emat, the blind area that it adopts drive coil separately and receiving coil design to reduce electromagnetic ultrasonic transducer, but this patent is to reduce shielding that two couplings between coil design can weaken receiving coil and detect hyperacoustic ability, and this patent does not relate to the difference in drive coil and receiving coil design simultaneously.Chinese patent CN93206367.5 discloses a kind of electromagnetic ultrasonic thickness gauge, it uses the method for Double-wire parallel wound to make all consistent excitation and receiving coils of physical dimension and the number of turn, make the distance of two coil distance test specimens consistent, but for same wire diameter and coil dimension, the drive coil of this patent and the receiving coil number of turn all only have half of unicoil sensor, and then cause excitation and receiving efficiency to decline to a great extent.In addition, Chinese patent CN200910073194.7 also discloses a kind of electromagnetic ultrasonic thickness gauge and measuring method thereof, the excitation of its sensor and receiving coil are produced in the two sides of the thick printed circuit board of 0.5mm, the receiving coil one side is near test specimen, two coil turn differences but diameter is consistent, be the impulse mgnet that there is no iron core but this patent used, needs to coordinate the pulse power to use, increased the use complexity, its coil design effect when using the permanent magnet magnetization is poor simultaneously.
Summary of the invention
Defect for prior art, the object of the present invention is to provide a kind of electromagnetic ultrasonic transducer and corresponding measuring method thereof for measuring the test specimen wall thickness, by the different operating for drive coil and receiving coil, require their set-up mode and other aspects are specifically optimized, can realize improving thus sensor conversion efficiency, strengthen the sensitivity of sensor, and improve the technique effect such as Signal-to-Noise.
In order to realize above-mentioned purpose of the present invention, according to one aspect of the present invention, provide a kind of for measuring the electromagnetic ultrasonic transducer of test specimen wall thickness, this electromagnetic ultrasonic transducer comprises:
Upper shell;
Lower house, this lower house docks combination mutually with upper shell, and its bottom has the secondary shoulder hole;
The energized plane coil, this energized plane coil is arranged in the darkest shoulder hole in lower house bottom, in the test specimen below being positioned over lower house, producing eddy current;
The receiving plane coil, it is interior and coaxially stacked with described energized plane coil that this receiving plane coil is arranged on the inferior dark shoulder hole in lower house bottom, the changes of magnetic field the output electrical signals that for responding to the test specimen eddy current, produce;
Screen layer, this screen layer is arranged on described receiving plane coil, for shielding the electromagnetic field on described energized plane coil top;
Magnet iron piece, this magnet iron piece is arranged on described screen layer, for generation of the bias magnetic field perpendicular to the test specimen surface; And
Joint, this jiont treatment, on upper shell, is connected with the receiving plane coil with described energized plane coil respectively by insulated conductor, for connecting thicknessmeter in order to carry out the measurement to the test specimen wall thickness; And
The axial projective area of described receiving plane coil is greater than the axial projective area of described energized plane coil, and the former is the latter 1.5～2 times.
The layout of twin coil and other elements by above-mentioned design, obtain a kind of effective layout type, make two planar coils spatially no longer mutually interfere, do not affect the sensing effect simultaneously, be conducive to improve launching efficiency and receiving sensitivity, and then can improve the conversion efficiency of sensor; In addition, by the further setting of relation between the axial projective area of two planar coils, the sensitivity that can improve the receiving plane coil, simultaneously larger axially effective projected area also is easy to increase coil turn, and then the induced voltage of intensifier coil.
As further preferably, the plane of polarization area of described magnet iron piece is greater than the axial projective area of described energized plane coil, and the former is the latter 2～4 times.
By the further setting of relation between the axial projective area to magnet iron piece plane of polarization area and energized plane coil, can guarantee that the sensitive zones magnetic field of sensor is even.
As further preferably, described receiving plane coils from parallel connection of coils has two reverse diodes, in order to limit the voltage magnitude of described receiving plane coil output.
Be closed flat by docking the setting that planar coil connects diode, can effectively limit the voltage magnitude that the receiving plane coil is exported, can reduce thus the energy of electromagnetic pulse, add the decay of fast pulse, reduce the measurement blind area of sensor.
As further preferably, described upper shell is made by conductive metal and is contacted with the external conductive casing of described joint and is connected, and the terminal that is connected to described receiving plane coil with this joint thus is connected, and this terminal is connected with the circuit ground of thicknessmeter by cable.
Be defined as conductive metal and make its setting that connects the circuit ground of thicknessmeter by the material by upper shell, can effectively shield the interference that the docking of external electromagnetic environment is closed flat planar coil, reduce the noise in signal.
As further preferably, described lower house is made by dielectric wear-resistant high-temperature resistance plastice, and its diameter is 2 times of described energized plane coil diameter.
Be defined as dielectric high performance material and set its diameter by the material by lower house, can avoid the energized plane coil to produce eddy current near lower house or its, reduce excitation loss, and play the effect of protection coil.
As further preferably, the thickness of the planar coil that the shoulder hole of the described lower house degree of depth at different levels is held with it respectively equates.
Further restriction by the shoulder hole degree of depth at different levels to holding planar coil, can make the planar coil residing shoulder hole of more fully fitting, can effectively avoid thus movement or the distortion of coil in shoulder hole, and then avoid the decline of consequent coupling efficiency.
According to another aspect of the present invention, the method for accordingly the test specimen wall thickness being measured is provided, the method comprises the following steps:
The joint of described sensor is connected with electromagnetic ultrasonic thickness gauge by wire, electromagnetic ultrasonic thickness gauge is connected with main control computer by USB cable;
Test specimen to be measured is placed on to the lower house below of electromagnetic ultrasonic transducer, and makes it near described energized plane coil and receiving plane coil;
Electromagnetic ultrasonic thickness gauge is set, opens power amplifier output exchange current to the energized plane coil, gather the electric signal of receiving plane coil output simultaneously.
Send data to main control computer after gathering end, main control computer is processed data, calculates the wall thickness of test specimen and is presented on the display screen of main control computer, completes thus the measuring process to the test specimen wall thickness.
According to electromagnetic ultrasonic transducer of the present invention and corresponding measuring method thereof, by sensor being used to the twin coil design and the aspects such as its set-up mode being improved, make sensor there is high launching efficiency, high receiving sensitivity and high s/n ratio, disturbing pulse in the time of can suppressing to encourage simultaneously, the measurement blind area that effectively reduces sensor.
The accompanying drawing explanation
Fig. 1 is the cut-open view according to electromagnetic ultrasonic transducer of the present invention;
Fig. 2 is the schematic diagram of the electromagnetic ultrasonic thickness measuring system of use electromagnetic ultrasonic transducer of the present invention;
Fig. 3 is the unicoil electromagnetic ultrasonic transducer rectified signal oscillogram that the planar coil diameter is 20mm;
Fig. 4 is for adopting design of the present invention but energized plane coil and receiving plane coil diameter are the dual coil electromagnetic sonac rectified signal oscillogram of 20mm;
Fig. 5 is for adopting design of the present invention but energized plane coil diameter 20mm, the dual coil electromagnetic sonac rectified signal oscillogram of receiving plane coil diameter 25mm.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, 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, is not intended to limit the present invention.
Fig. 1 is the cut-open view according to electromagnetic ultrasonic transducer of the present invention.As shown in Figure 1, a kind of for measuring the electromagnetic ultrasonic transducer of test specimen wall thickness, comprise joint 1, for example be magnet iron piece 2, screen layer 3, receiving plane coil 4, energized plane coil 5, insulated conductor 8, lower house 6, upper shell 7 and the diode 9 of permanent magnet or electromagnet.The lower house 6 that polytetrafluoroethylplastic plastic is made is a cup-like structure, and lower surface is the ultrasonic sensing zone, and there is screw thread in the wall of cup outside, the inboard leaded groove of wall of cup, and the cup inner bottom part has the secondary shoulder hole.Bottom, hole wall thickness is very little, to reduce the distance of coil to test specimen.Energized plane coil 5 is arranged in the darkest shoulder hole of lower house cup inside bottom, and hole depth is identical with coil thickness.Receiving plane coil 4 one sides are close to energized plane coil 5 coaxial with it, are arranged in inferior dark shoulder hole, form energized plane coil 5 and the axial stacked structure of receiving plane coil 4.The opposite side of receiving plane coil 4 is screen layer 3 and magnet iron piece 2, and screen layer 3 pads, below magnet iron piece 2, separate receiving plane coil 4 and magnet iron piece 2 thus.Magnet iron piece 2 is plane of polarization near the face of receiving plane coil, and energized plane coil 5 is connected respectively insulated conductor 8 with receiving plane coil 4, insulated conductor 8 jointings 1, and joint 1 is arranged on upper shell 7.
Upper shell 7 is connected and holds with lower house 6 and fixed magnet part 2, screen layer 3, receiving plane coil 4, energized plane coil 5, insulated conductor 8 and diode 9 by screw thread.Upper shell 7 is connected by contact with the external conductive casing of joint 1, and a terminal that is connected to receiving plane coil 4 with joint 1 thus is connected, and this terminal is connected with the circuit ground of electromagnetic ultrasonic thickness gauge 11 by cable.
The shoulder hole that upper shell 7 inside are three grades, the most shallow hole inwall is processed with screw thread, for being connected with lower house 6, darker hole is for holding permanent magnet 2, use the step surface axial location permanent magnet 2 between darker hole and the darkest hole, the darkest hole is for holding connection terminal, diode 9 and the SI semi-insulation wire 8 of joint 1.Upper shell 7 is with after lower house 6 is connected, and upper shell 7 has wrapped up the side of whole lower house, and lower house 6 only has bottom surface to expose.Energized plane coil 5, receiving plane coil 4 are located by the secondary shoulder hole of lower house 6 separately.Energized plane coil 5 is connected respectively insulated conductor 8 with receiving plane coil 4, and insulated conductor 8 leads to magnet iron piece 2 tops and is connected to joint 1 along the wire lead slot of lower house 6.The insulated conductor 8 that connects receiving plane coil 4 can connect two diodes 9 that parallel connection is reverse.Upper shell 7 upper ends of aluminum alloy materials are processed with mounting hole.Joint 1, through this mounting hole, is fixed on upper shell 7 thus.
Electromagnetic ultrasonic transducer of the present invention is used vertical shear wave to carry out thickness measuring, and sensitive zones is under lower house 6.Magnet iron piece 2 is for generation of the bias magnetic field perpendicular to the test specimen surface, to motivate the shear wave of propagating perpendicular to the test specimen surface.Energized plane coil 5 is arranged on the lower house bottommost, and apart from the test specimen near distance, so coupling efficiency is high.Receiving plane coil 4 is slightly far away apart from test specimen, but not excited target coil constraint of structural design.Between receiving plane coil 4 and test specimen, there is energized plane coil 5 to intercept, but little on the receiving sensitivity impact.Although receiving plane coil 4 is apart from test specimen generation signal attenuation slightly far away, comprehensive sensing effect is not significantly affected, and no longer interferes on energized plane coil and receiving plane coil space, is conducive to optimal design.
The axial projective area of receiving plane coil 4 is set to the axial projective area that is greater than energized plane coil 5.So-called axial projective area, refer to that coil projects to perpendicular to the area on the plane of axis along central axis.The axial projective area of energized plane coil is larger, and the ratio of the axial projective area between two coils is larger.Receiving plane coil 4 adopts the design of the large axial projective area than energized plane coil 5, can obtain higher sensitivity.Simultaneously larger axially effective projected area also is easy to increase coil turn, and then the induced voltage of intensifier coil.But receiving plane coil 4 axial projective areas are when excessive, and no longer consistent by the magnetic direction of coil, signal amplitude no longer strengthens, and even can make signal attenuation.Therefore by actual comparative study, the axial projective area of receiving plane coil 4 is set as to 1.5～2 times of axial projective area of energized plane coil 5, prove and can obtain better effect in practice.
Energized plane coil 5 and receiving plane coil 4 all can adopt snail line coil.For example, energized plane coil 5 diameter 20mm, receiving plane coil 4 diameter 25mm, both axial projective area ratios are 1.6.Except snail line coil, can also use three-back-shaped coil or Lu's font coil.The coil of which kind of shape no matter, the axial projective area that increases receiving plane coil 4 all can effectively strengthen signal.Coil can be used the insulated copper wire coiling or use printed circuit board to make.
The plane of polarization area of magnet iron piece 2 is set as being greater than the axial projective area of energized plane coil 5, can guarantee that like this sensor senses regional magnetic field is even.Too small magnet iron piece plane of polarization area can make the vertical magnetic field of test specimen inside inhomogeneous, reduces hyperacoustic launching efficiency and produces other mode.Excessive magnet iron piece plane of polarization area does not have advantageous effects to sensor, can make sensor bulk huge simultaneously, uses inconvenience.Therefore, by research, preferably the plane of polarization area of magnet iron piece 2 is 2～4 times of axial projective area of energized plane coil 5, and for example 3 times, this design more is conducive to provide uniform vertical off setting magnetic field.
Receiving plane coil 4 can be connected in parallel to two reverse diodes 9, can limit thus the voltage magnitude of receiving plane coil 4 induction outputs.In the signal that electromagnetic ultrasonic transducer receives, the electromagnetic pulse that while working except drive coil, receiving plane coil and energized plane coil direct-coupling receive, ultrasonic signal is much smaller than the forward voltage of diode 9, therefore diode 9 can reduce the energy that electromagnetism is disturbed pulse, accelerate the decay of electromagnetic pulse, reduce the measurement blind area of sensor, but do not affect normal ultrasonic signal.
The upper shell 7 of good earth has covered the top and side of whole probe, and the docking of shielding external electromagnetic environment is closed flat the interference of planar coil 4, reduces the noise in signal.In addition, in the lower house 6 that plastics are made, can not produce eddy current, avoid in the housing producing the excitation energy loss that eddy current causes, fix simultaneously, protected coil, provide electromagnetic field to pass window.Metal upper shell 7 has lower house 6 sidewalls to separate with the energized plane coil, a little less than the coupling of energized plane coil 5, also avoids consuming excitation energy.
Fig. 2 is the schematic diagram of a set of electromagnetic ultrasonic thickness measuring system of the above-mentioned electromagnetic ultrasonic transducer of use.As shown in Figure 2, whole thickness measuring system is by electromagnetic ultrasonic transducer 10, and electromagnetic ultrasonic thickness gauge 11 and main control computer 12 3 parts form.Electromagnetic ultrasonic thickness gauge 11 comprises programme-controlled signal source 13, power amplifier 14, wide bandwidth signal conditioning circuit 15 and 16 4 parts of signal acquisition circuit.Main control computer 12 connects electromagnetic ultrasonic thickness gauge 11 by USB cable.Programme-controlled signal source 13 output terminals connect power amplifier 14.The input end of the output terminal of gate power amplifier 14 and wide bandwidth signal conditioning circuit 15 is connected to electromagnetic ultrasonic transducer 10 by quad.The output terminal of wide bandwidth signal conditioning circuit 15 connects signal acquisition circuit 16.After being placed on test specimen by electromagnetic ultrasonic transducer 10, signal occurs and receives the data that signal acquisition circuit 16 is exported in the programme-controlled signal source 13 that uses main control computer 12 to control in electromagnetic ultrasonic thickness gauge 11.Main control computer 12 just can show the thickness of test specimen after data are processed on screen.
Fig. 3 is the unicoil electromagnetic ultrasonic transducer rectified signal oscillogram that the planar coil diameter is 20mm.Fig. 4 is for adopting design of the present invention but energized plane coil and receiving plane coil diameter are the dual coil electromagnetic sonac rectified signal oscillogram of 20mm.Fig. 5 is for adopting design of the present invention but energized plane coil diameter 20mm, the dual coil electromagnetic sonac rectified signal oscillogram of receiving plane coil diameter 25mm.
In above-mentioned accompanying drawing, Reference numeral M
1for the electromagnetic pulse of drive coil and the generation of receiving coil direct-coupling, N is the interference that duplicate circuitry produces, S
1for the echo of test specimen bottom surface first reflection, S
2for the echo that the test specimen bottom surface is reflected for the second time, S
3, S
4, S
5the like.
Comparison diagram 3 and Fig. 4 are visible, although the receiving coil in the dual coil electromagnetic sonac is slightly far away apart from test specimen, less to effect of signals.The amplitude of its corresponding echoed signal is only a little less than the unicoil electromagnetic ultrasonic transducer.But duration and the noise of its electromagnetic pulse all obviously reduce.The signal to noise ratio (S/N ratio) of sensor and measurement blind area are better than the unicoil electromagnetic ultrasonic transducer.
Comparison diagram 4 and Fig. 5 are visible, and the two kinds of sensors only design of receiving plane coil are inconsistent, and the axial projective area of the receiving plane coil of Fig. 5 sensor is larger.The result of two kinds of contrasts shows that the axial projective area that the receiving plane coil is larger is conducive to strengthen signal amplitude.The signal waveform of synthesizing map 3, Fig. 4, Fig. 5, result shows, and the electromagnetic ultrasonic thickness measuring sensor of the present invention's design has launching efficiency and receiving sensitivity is high, and signal to noise ratio (S/N ratio) is good, measures the little advantage in blind area.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. one kind for measuring the electromagnetic ultrasonic transducer of test specimen wall thickness, and this electromagnetic ultrasonic transducer comprises:
Upper shell;
Lower house, this lower house docks combination mutually with upper shell, and its bottom has the secondary shoulder hole;
The energized plane coil, this energized plane coil is arranged in the darkest shoulder hole in lower house bottom, in the test specimen below being positioned over lower house, producing eddy current;
The receiving plane coil, it is interior and coaxially stacked with described energized plane coil that this receiving plane coil is arranged on the inferior dark shoulder hole in lower house bottom, the changes of magnetic field the output electrical signals that for responding to the test specimen eddy current, produce;
Screen layer, this screen layer is arranged on described receiving plane coil, for shielding the electromagnetic field on described energized plane coil top;
Magnet iron piece, this magnet iron piece is arranged on described screen layer, for generation of the bias magnetic field perpendicular to the test specimen surface; And
Joint, this jiont treatment, on upper shell, is connected with the receiving plane coil with described energized plane coil respectively by insulated conductor, for connecting thicknessmeter in order to carry out the measurement to the test specimen wall thickness; And the axial projective area of described receiving plane coil is greater than the axial projective area of described energized plane coil, and the former is the latter 1.5～2 times.
2. as claimed in claim 1ly for measuring the electromagnetic ultrasonic transducer of test specimen wall thickness, it is characterized in that, the plane of polarization area of described magnet iron piece is greater than the axial projective area of described energized plane coil, and the former is the latter 2～4 times.
3. as claimed in claim 1 or 2ly for measuring the electromagnetic ultrasonic transducer of test specimen wall thickness, it is characterized in that, described receiving plane coils from parallel connection of coils has two reverse diodes, with the voltage magnitude of restriction receiving plane coil output.
4. as claimed in claim 1 or 2 for measuring the electromagnetic ultrasonic transducer of test specimen wall thickness, it is characterized in that, described upper shell is made by conductive metal and is contacted with the external conductive casing of described joint and is connected, the terminal that is connected to described receiving plane coil with this joint thus is connected, and this terminal is connected with the circuit ground of thicknessmeter by cable.
5. as claimed in claim 4ly for measuring the electromagnetic ultrasonic transducer of test specimen wall thickness, it is characterized in that, described lower house is made by dielectric wear-resistant high-temperature resistance plastice, and its diameter is 2 times of described energized plane coil diameter.
6. as claimed in claim 1 or 2ly for measuring the electromagnetic ultrasonic transducer of test specimen wall thickness, it is characterized in that, the thickness of the planar coil that the shoulder hole of the described lower house degree of depth at different levels is held with it respectively equates.
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| JP6398380B2 (en) * | 2014-06-30 | 2018-10-03 | 富士ゼロックス株式会社 | Molded thickness recognition device, molded thickness recognition system, and molded thickness recognition program |
| CN105043310B (en) * | 2015-06-18 | 2018-03-16 | 中国特种设备检测研究院 | The straight incoming electromagnetic sonac of shear wave |
| CN105223266B (en) * | 2015-10-23 | 2018-08-03 | 华中科技大学 | A kind of electromagnetic acoustic detection method and device from perception operating point |
| CN105258659B (en) * | 2015-11-10 | 2018-04-17 | 中国特种设备检测研究院 | Implanted corrosive pipeline monitors electromagnetic ultrasonic transducer on-line |
| CN109781838B (en) * | 2019-03-02 | 2021-03-16 | 厦门大学 | Vortex-ultrasonic detection probe based on V-shaped coil excitation |
| CN112254685A (en) * | 2020-05-26 | 2021-01-22 | 福州晋安尧琦侗科技有限公司 | Automatic thickness measuring and marking device for floor |
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| JPH0296607A (en) * | 1988-10-04 | 1990-04-09 | Babcock Hitachi Kk | Transducer for electromagnetic ultrasonic wave |
| CN101701809B (en) * | 2009-11-12 | 2011-05-04 | 哈尔滨工业大学 | Electromagnetic ultrasonic thickness gauge and measurement method thereof |
| CN101701810B (en) * | 2009-11-13 | 2011-09-28 | 哈尔滨工业大学 | Electromagnetic ultrasonic transducer capable of reducing echo of magnet |
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