CN111024827A - Electromagnetic ultrasonic SV wave and surface wave detection system - Google Patents

Electromagnetic ultrasonic SV wave and surface wave detection system Download PDF

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Publication number
CN111024827A
CN111024827A CN201911266547.5A CN201911266547A CN111024827A CN 111024827 A CN111024827 A CN 111024827A CN 201911266547 A CN201911266547 A CN 201911266547A CN 111024827 A CN111024827 A CN 111024827A
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wave
layer coil
filter
surface wave
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涂君
蔡卓越
宋小春
张旭
徐煦源
文辉
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Hubei University of Technology
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/36—Detecting the response signal, e.g. electronic circuits specially adapted therefor
    • G01N29/42—Detecting the response signal, e.g. electronic circuits specially adapted therefor by frequency filtering or by tuning to resonant frequency
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/34—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor
    • G01N29/341—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor with time characteristics
    • G01N29/343—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor with time characteristics pulse waves, e.g. particular sequence of pulses, bursts
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/04—Wave modes and trajectories
    • G01N2291/042—Wave modes
    • G01N2291/0422—Shear waves, transverse waves, horizontally polarised waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/04—Wave modes and trajectories
    • G01N2291/042—Wave modes
    • G01N2291/0423—Surface waves, e.g. Rayleigh waves, Love waves

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Abstract

The embodiment of the invention provides an electromagnetic ultrasonic SV wave and surface wave detection system, which is used for exciting an SV wave signal and a surface wave signal through a pulse generator and respectively detecting internal defects, surface defects and near-surface defects of a detected piece. In the embodiment of the invention, the double-layer coils are used for respectively receiving the detection signals returned by the detected piece, the first layer coil is connected with the first filter, the second layer coil is connected with the second filter, and the high-frequency SV wave signal and the low-frequency surface wave signal can be separated, so that the problem that the ultrasonic flaw detection has surface defect signals which are easily submerged in interface waves or bottom waves to cause flaw detection blind areas is solved, and all parts of the detected piece can be simultaneously detected.

Description

Electromagnetic ultrasonic SV wave and surface wave detection system
Technical Field
The invention relates to the technical field of electromagnetic ultrasound, in particular to an electromagnetic ultrasonic SV wave and surface wave detection system.
Background
At present, compared with the traditional piezoelectric ultrasonic technology, the electromagnetic ultrasonic detection technology does not need a coupling agent, and has the advantages of non-contact, high detection speed, low requirement on the surface of a test piece and the like, so that the electromagnetic ultrasonic detection technology is widely applied to defect detection of the tested piece.
Since the surface wave signal intensity attenuates as the depth of the surface of the object increases, the surface wave signal substantially disappears beyond the double depth.
In addition, when ultrasonic flaw detection is adopted, a surface or near-surface flaw signal is easily submerged in interface waves or bottom waves, and a flaw detection blind area exists.
At present, the research at home and abroad combines electromagnetic ultrasound and pulse eddy current technology to detect a tested piece, and utilizes pulse eddy current to detect the surface defect of the tested piece and electromagnetic ultrasonic body wave to detect the internal defect. On one hand, the energy of the pulse eddy current is mainly distributed at about three times of the skin depth, so that the blind area depth existing when the electromagnetic ultrasonic body wave detects the internal defects can not be covered, and the problem of the existence of a flaw detection blind area can not be solved; on the other hand, the electromagnetic ultrasound and the eddy current are actually excited and received separately, and the two probes are different in spatial position, so that the defect detection of the same position cannot be realized.
Disclosure of Invention
To overcome or at least partially solve the above problems, embodiments of the present invention provide an electromagnetic ultrasonic SV wave and surface wave detection system.
The embodiment of the invention provides an electromagnetic ultrasonic SV wave and surface wave detection system, which comprises: a pulse generator, a transducer, a first filter and a second filter;
the transducer comprises a permanent magnet and a double-layer coil, wherein the double-layer coil is arranged on the lower surface of the permanent magnet;
the double-layer coil comprises a first layer coil and a second layer coil, the pulse generator is connected with the first layer coil, and the pulse generator is used for providing pulses with different frequency bands for the first layer coil so as to excite SV wave signals and surface wave signals;
the first layer coil is connected with the first filter, the second layer coil is connected with the second filter, the first layer coil and the second layer coil are used for receiving a detection signal returned by a detected piece, the first filter is used for extracting a surface wave signal in the detection signal, and the second filter is used for extracting an SV wave signal in the detection signal.
Preferably, the magnetic field direction of the permanent magnet is perpendicular to the plane of the double-layer coil.
Preferably, the double-layer coil is embodied as a double-layer meander coil.
Preferably, the pulse generator is specifically configured to:
providing pulses in a first frequency band to the first layer coil to excite an SV wave signal;
providing pulses in a second frequency band to the first tier coil to excite a surface wave signal;
the frequencies of the first frequency band are all higher than the frequencies of the second frequency band.
Preferably, the frequency of the first frequency band is determined based on a propagation speed of an SV wave signal in the measured member, a wire pitch of the first layer coil, and a deflection angle of the SV wave signal.
Preferably, the frequency of the first frequency band is specifically determined by the following formula:
Figure BDA0002313003990000021
wherein f is1Is the frequency of the first frequency band, cTAnd the propagation speed of the SV wave signal in the tested piece is l, the wire spacing of the first layer of coil is l, and the deflection angle of the SV wave signal is theta.
Preferably, the frequency of the second frequency band is determined based on a propagation speed of a surface wave signal in the measured object and a wire spacing of the first layer coil.
Preferably, the frequency of the second frequency band is specifically determined by the following formula:
Figure BDA0002313003990000031
wherein f is2Is the frequency of the second frequency band, cRAnd l is the wire spacing of the first layer of coils, wherein l is the propagation speed of a surface wave signal in the tested piece.
Preferably, the electromagnetic ultrasonic SV wave and surface wave detection system further includes: a first oscilloscope and a second oscilloscope;
the first filter and the second filter are both connected with the pulse generator;
the first oscilloscope and the second oscilloscope are respectively connected with the pulse generator;
the first oscilloscope is used for displaying a surface wave signal in the detection signal, and the second oscilloscope is used for displaying an SV wave signal in the detection signal.
Preferably, the electromagnetic ultrasonic SV wave and surface wave detection system further includes: a first preamplifier and a second preamplifier;
the first preamplifier is connected between the first layer coil and the first filter, and the second preamplifier is connected between the second layer coil and the second filter.
According to the electromagnetic ultrasonic SV wave and surface wave detection system provided by the embodiment of the invention, the SV wave signal and the surface wave signal are excited by the pulse generator and are respectively used for detecting the internal defect and the surface and near-surface defect of the detected piece. In the embodiment of the invention, the double-layer coils are used for respectively receiving the detection signals returned by the detected piece, the first layer coil is connected with the first filter, the second layer coil is connected with the second filter, and the high-frequency SV wave signal and the low-frequency surface wave signal can be separated, so that the problem that the ultrasonic flaw detection has surface defect signals which are easily submerged in interface waves or bottom waves to cause flaw detection blind areas is solved, and all parts of the detected piece can be simultaneously detected.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an electromagnetic ultrasonic SV wave and surface wave detection system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a transducer in an electromagnetic ultrasonic SV wave and surface wave detection system according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an electromagnetic ultrasonic SV wave and surface wave detection system according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an electromagnetic ultrasonic SV wave and surface wave detection system according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a tested object according to an embodiment of the present invention;
FIG. 6 is a diagram illustrating a display result on a second oscilloscope of the electromagnetic ultrasonic SV wave and surface wave detection system according to the present invention;
fig. 7 is a schematic diagram of a display result on a first oscilloscope in an electromagnetic ultrasonic SV wave and surface wave detection system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1, an embodiment of the present invention provides an electromagnetic ultrasonic SV wave and surface wave detection system, including: a pulse generator 1, a transducer 2, a first filter 3 and a second filter 4. As shown in fig. 2, the transducer 2 includes a permanent magnet 21 and a double-layer coil 22, and the double-layer coil 22 is disposed on the lower surface of the permanent magnet 21. When the electromagnetic ultrasonic SV wave and surface wave detection system is applied to detect the tested piece, the transducer 2 is placed on the upper surface of the tested piece 5.
The double-layer coil 22 includes a first layer coil and a second layer coil, and the pulse generator 1 is connected to the first layer coil and configured to provide pulses of different frequency bands to the first layer coil to excite an SV wave signal and a surface wave signal. The SV wave signal enters the interior of the tested piece 5 and returns to the second layer coil through the tested piece 5, and the second layer coil receives a detection signal returned by the tested piece. The surface wave signal does not enter the inside of the measured object 5, but stays on the surface and near surface of the measured object 5, and returns to the first layer coil through the measured object 5, and the first layer coil receives the detection signal returned by the measured object 5. It should be noted that the thickness of the measured object 5 needs to be 4 times larger than the wavelength of the surface wave signal excited by the pulse generator 1.
It should be noted that the detection signal returned by the tested object 5 is a mixture of an SV wave signal and a surface wave signal, so in the embodiment of the present invention, the first layer coil is connected to the first filter 3, the detection signal returned by the tested object 5 is transmitted to the first filter 3, the detection signal returned by the tested object 5 is filtered by the first filter 3, the surface wave signal in the detection signal is extracted, and the surface and near surface defect detection of the tested object 5 is realized. The second layer coil is connected with the second filter 4, the detection signal returned by the detected piece 5 is transmitted to the second filter 4, the detection signal returned by the detected piece 5 is filtered through the second filter 4, the SV wave signal in the detection signal is extracted, and the internal defect detection of the detected piece 5 is realized.
In the embodiment of the invention, when the pulse generator provides pulses of different frequency bands for the first layer coil, the pulse generator can provide pulses of one frequency band at each time point in time sequence. The pulse generator may provide high band pulses to the first layer coil to excite the SV wave signal and may provide low band pulses to the first layer coil to excite the surface wave signal. Since the pulse generator generates pulses of different frequency bands at short intervals, it can be considered that the SV wave signal and the surface wave signal are generated simultaneously. Before the pulse generator provides pulses of different frequency bands for the first layer coil, impedance matching can be performed, namely an impedance matching device is added between the pulse generator and the transducer.
In an embodiment of the present invention, the first layer coil specifically includes two functions for exciting signals and receiving surface waves, and the first layer coil is connected to the pulse generator and the first filter at the same time. The second layer coil comprises in particular a function for receiving SV waves, which is connected to a second filter.
In the embodiment of the present invention, the first filter 3 may specifically be a low-pass filter, that is, a low-frequency portion, that is, a surface wave signal, in a detection signal returned by the detected piece 5 is retained; the second filter 4 may be in particular a high-pass filter, i.e. a high-frequency part of the detection signal returned by the element under test 5, i.e. the SV wave signal, is retained. This allows the high frequency SV wave signal and the low frequency surface wave signal to be separated. The cut-off frequencies of the first filter 3 and the second filter 4 can be set as required.
The electromagnetic ultrasonic SV wave and surface wave detection system provided by the embodiment of the invention excites SV wave signals and surface wave signals through the pulse generator and is respectively used for detecting internal defects, surface defects and near-surface defects of a detected piece. In the embodiment of the invention, the double-layer coils are used for respectively receiving the detection signals returned by the detected piece, the first layer of coils is connected with the first filter, and the second layer of coils is connected with the second filter, so that the high-frequency SV wave signals and the low-frequency surface wave signals can be separated, the problem that the ultrasonic flaw detection has surface defect signals which are easily submerged in interface waves or bottom waves to cause flaw detection blind areas is solved, and all parts of the detected piece can be simultaneously detected.
On the basis of the above embodiments, in the electromagnetic ultrasonic SV wave and surface wave detection system provided in the embodiments of the present invention, the magnetic field direction of the permanent magnet is perpendicular to the plane where the double-layer coil is located, that is, the permanent magnet may provide a vertical bias magnetic field.
On the basis of the above embodiments, the double-layer coil provided in the embodiments of the present invention is specifically a double-layer meander coil.
On the basis of the above embodiments, the pulse generator provided in the embodiments of the present invention is specifically configured to:
providing pulses in a first frequency band to the first layer coil to excite an SV wave signal;
providing pulses in a second frequency band to the first tier coil to excite a surface wave signal;
the frequencies of the first frequency band are all higher than the frequencies of the second frequency band.
Specifically, in the embodiment of the present invention, the SV wave signal is excited by supplying a pulse of a high frequency band to the first layer coil, and the surface wave signal is excited by supplying a pulse of a low frequency band to the first layer coil.
On the basis of the above embodiment, in the electromagnetic ultrasonic SV wave and surface wave detection system provided in the embodiment of the present invention, the frequency of the first frequency band is determined based on the propagation speed of the SV wave signal in the measured object, the wire pitch of the first layer coil, and the deflection angle of the SV wave signal, and specifically determined by the following formula:
Figure BDA0002313003990000071
wherein f is1Is the frequency of the first frequency band, cTThe propagation speed of the SV wave signal in the tested piece, i is the wire spacing of the first layer of coil, and theta is the deflection angle of the SV wave signal, and can be set according to requirements.
The above formula can also be modified as:
Figure BDA0002313003990000072
wherein λ isTIs the wavelength of the SV wave signal in the tested piece.
On the basis of the above embodiment, in the electromagnetic ultrasonic SV wave and surface wave detection system provided in the embodiment of the present invention, the frequency of the second frequency band is determined based on the propagation speed of the surface wave signal in the measured object and the wire spacing of the first layer coil, and is specifically determined by the following formula:
Figure BDA0002313003990000081
wherein f is2Is the frequency of the second frequency band, cRAnd l is the wire spacing of the first layer of coils, wherein l is the propagation speed of a surface wave signal in the tested piece.
The above formula can also be modified as:
Figure BDA0002313003990000082
wherein λ isRIs the wavelength of the surface wave signal in the measured piece.
Propagation speed c of surface wave signal in the measured objectRWith the speed of propagation c of the SV wave signal in said piece under testTThe relationship between them is:
Figure BDA0002313003990000083
wherein σ is the Poisson's ratio of the measured piece.
On the basis of the above embodiment, the electromagnetic ultrasonic SV wave and surface wave detection system provided in the embodiment of the present invention further includes: a first oscilloscope and a second oscilloscope;
the first filter and the second filter are both connected with the pulse generator;
the first oscilloscope and the second oscilloscope are respectively connected with the pulse generator;
the first oscilloscope is used for displaying a surface wave signal in the detection signal, and the second oscilloscope is used for displaying an SV wave signal in the detection signal.
Specifically, as shown in fig. 3, the electromagnetic ultrasonic SV wave and surface wave detection system further includes: the first oscilloscope 6 and the second oscilloscope 7 are connected with the pulse generator 1, and the first filter 3 and the second filter 4 are connected with the pulse generator 1; the first oscilloscope 6 and the second oscilloscope 7 are respectively connected with the pulse generator 1, so that the signal sources entering the first filter and the second oscilloscope are the same; the first oscilloscope 6 is used for displaying the surface wave signal returned by the tested piece 5, and the second oscilloscope 6 is used for displaying the SV wave signal returned by the tested piece 7.
On the basis of the above embodiment, the electromagnetic ultrasonic SV wave and surface wave detection system provided in the embodiment of the present invention further includes: a first preamplifier and a second preamplifier;
the first preamplifier is connected between the first layer coil and the first filter, and the second preamplifier is connected between the second layer coil and the second filter.
Specifically, as shown in fig. 4, the electromagnetic ultrasonic SV wave and surface wave detection system further includes: a first preamplifier 8 and a second preamplifier 9;
the first preamplifier 8 is connected between the first layer coil and the first filter 3, and the second preamplifier 9 is connected between the second layer coil and the second filter 4. In fig. 4, an impedance matching device 10 is further provided between the pulse generator 1 and the double-layer coil for realizing impedance matching.
As will be described in detail below, the object to be measured may be a steel plate 51, and the transducer 2 is disposed on the upper surface of the steel plate 51, as shown in fig. 5. The steel plate 51 has a length of 350mm, a width of 40mm and a height of 170 mm. The positions 50mm away from the left end face and the right end face of the steel plate are respectively provided with a round through hole 52 and a round through hole 53 with the diameter of 3mm, the depth of the round through hole 52 at the left side is 10mm, and the depth of the round through hole 53 at the right side is 30 mm.
The length of the permanent magnet in the transducer is 40mm, the width of the permanent magnet is 40mm, the height of the permanent magnet is 20mm, and the double-layer coil in the transducer is placed in the middle of the lower end face of the permanent magnet. The double-layer coil in the transducer is a double-layer zigzag coil with the size of 30 mm. The first layer of coil is a single-turn coil with 16 leads in total, the lead spacing is 2mm, the second layer of coil is a multi-turn coil with 6 turns in total, each turn has 8 leads, the lead spacing of each turn is 2mm, and the coil spacing of each turn is 0.3 mm.
The center of the permanent magnet is 67.32mm away from the right end face of the steel plate, and the lower end face of the permanent magnet is 1mm away from the surface of the steel plate. The propagation velocity of the SV wave signal in the steel sheet is: c. CTThe poisson ratio of the steel plate is 0.3 when the poisson ratio is 3.23km/s, so the propagation speed of the surface wave signal in the steel plate is as follows:
Figure BDA0002313003990000091
according to the propagation speed of the SV wave signal in the steel plate, the propagation speed of the surface wave signal in the steel plate and the wire spacing of the first layer of coil, the frequency of the SV wave signal with the deflection angle of 30 degrees excited by the pulse generator is as follows:
Figure BDA0002313003990000092
the frequency of the surface wave signal excited by the pulse generator is:
Figure BDA0002313003990000101
according to the difference between the frequency of the surface wave signal and the frequency of the SV wave signal with the deflection angle of 30 degrees, the cut-off frequency LP of the first filter is set to be 1MHz, the cut-off frequency HP of the second filter is set to be 1MHz, after filtering, the surface wave signal returned by the tested piece is displayed on the first oscilloscope, and the SV wave signal returned by the tested piece with the deflection angle of 30 degrees is displayed on the second oscilloscope.
The phi 3mm hole 30mm deep on the right side of the steel plate is just 30 degrees below the center of the transducer on the right, the display result on the second oscilloscope is shown in fig. 6, and the display result on the first oscilloscope is shown in fig. 7. In fig. 6, the ordinate is the result of normalization processing of the SV wave signal returned by the measured piece, the abscissa is time in seconds(s), and the wave packet is a phi 3mm hole reflection signal. In fig. 7, the ordinate is the result of normalization processing of the surface wave signal returned by the measured piece, the abscissa is time in seconds(s), the first wave packet is the right-side end echo of the steel plate, the second wave packet is the reflected signal of the phi 3mm hole with the depth of 10mm on the left side of the steel plate, the third wave packet is the left-side end echo of the steel plate, and the fourth wave packet is the signal where the two end echoes of the steel plate join below the transducer.
As can be seen from fig. 6 and 7, the electromagnetic ultrasonic SV wave and surface wave detection system provided in the embodiment of the present invention can detect the surface or near-surface defect and the internal defect of the tested object at the same position.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. An electromagnetic ultrasonic SV wave and surface wave detection system, comprising: a pulse generator, a transducer, a first filter and a second filter;
the transducer comprises a permanent magnet and a double-layer coil, wherein the double-layer coil is arranged on the lower surface of the permanent magnet;
the double-layer coil comprises a first layer coil and a second layer coil, the pulse generator is connected with the first layer coil, and the pulse generator is used for providing pulses with different frequency bands for the first layer coil so as to excite SV wave signals and surface wave signals;
the first layer coil is connected with the first filter, the second layer coil is connected with the second filter, the first layer coil and the second layer coil are used for receiving a detection signal returned by a detected piece, the first filter is used for extracting a surface wave signal in the detection signal, and the second filter is used for extracting an SV wave signal in the detection signal.
2. The system of claim 1, wherein the magnetic field of said permanent magnet is oriented perpendicular to the plane of said double-layer coil.
3. Electromagnetic ultrasonic SV wave and surface wave detection system as claimed in claim 1 in which the double layer coil is embodied as a double layer meander coil.
4. The electromagnetic ultrasonic SV wave and surface wave detection system of claim 1 wherein the pulse generator is specifically configured to:
providing pulses in a first frequency band to the first layer coil to excite an SV wave signal;
providing pulses in a second frequency band to the first tier coil to excite a surface wave signal;
the frequencies of the first frequency band are all higher than the frequencies of the second frequency band.
5. The electromagnetic ultrasonic SV wave and surface wave detection system as claimed in claim 4 wherein the frequency in the first frequency band is determined based on the speed of propagation of SV wave signals in the test piece, the wire spacing of the first layer of coils, and the deflection angle of SV wave signals.
6. The electromagnetic ultrasonic SV wave and surface wave detection system as claimed in claim 5 wherein the frequency of the first frequency band is determined by the following equation:
Figure FDA0002313003980000011
wherein f is1Is the frequency of the first frequency band, cTAnd the propagation speed of the SV wave signal in the tested piece is l, the wire spacing of the first layer of coil is l, and the deflection angle of the SV wave signal is theta.
7. The electromagnetic ultrasonic SV wave and surface wave detection system as claimed in claim 4 wherein the frequency of the second frequency band is determined based on the propagation speed of the surface wave signal in the object under test and the wire spacing of the first layer of coils.
8. The system of claim 7, wherein said second band of frequencies is determined by the following equation:
Figure FDA0002313003980000021
wherein f is2Is the frequency of the second frequency band, cRAnd l is the wire spacing of the first layer of coils, wherein l is the propagation speed of a surface wave signal in the tested piece.
9. The electromagnetic ultrasonic SV wave and surface wave detection system of claim 1 further comprising: a first oscilloscope and a second oscilloscope;
the first filter and the second filter are both connected with the pulse generator;
the first oscilloscope and the second oscilloscope are respectively connected with the pulse generator;
the first oscilloscope is used for displaying a surface wave signal in the detection signal, and the second oscilloscope is used for displaying an SV wave signal in the detection signal.
10. The electromagnetic ultrasonic SV wave and surface wave detection system of any one of claims 1-9 further comprising: a first preamplifier and a second preamplifier;
the first preamplifier is connected between the first layer coil and the first filter, and the second preamplifier is connected between the second layer coil and the second filter.
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Application publication date: 20200417