SH guided wave detection device and guided wave transducer thereof
By designing a winding structure with sparse middle and densely distributed at both ends in the waveguide transducer, the reflected signal deformation and aliasing problems caused by the wide width of the ultrasonic wave packet in the prior art are solved, and more accurate defect detection is achieved.
Patent Information
- Application Number
- CN202411558636.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-04
- Publication Date
- 2025-03-14
AI Technical Summary
In the complex defect detection of existing electromagnetic ultrasonic transducers, due to the wide width of ultrasonic wave packets, the deformation of the reflected signal is difficult to predict, and the reflected wave and ultrasonic wave may alias, affecting the accuracy of defect detection.
A wave guide transducer is designed with a sparse winding structure in the middle and densely distributed at both ends. By optimizing ultrasonic design parameters and excitation signal design parameters, the wave packet width of ultrasonic and reflected waves is narrowed to avoid signal deformation and aliasing.
It effectively improves the credibility of the reflected signal and enhances the accuracy of the SH waveguide detection device in defect detection.
Smart Images
Figure CN119619290A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of defect detection, and in particular to an SH waveguide detection device and a waveguide transducer thereof. Background Art
[0002] In nuclear power plants, turbine rotor blades run at high speed for a long time, and the blades are fixed and locked on the rotor through the wheel grooves on the rotor. During high-speed rotation, the wheel grooves are subjected to high temperature, high pressure, high centrifugal force, steam bending stress, exciting force, fatigue corrosion, vibration, and water droplet erosion in the wet steam area, which causes stress concentration at the location where the wheel groove surface changes shape. Scratches may also be generated during the blade removal process, inducing stress concentration, and wheel groove cracks may occur under high-frequency vibration, thus causing rotor failure. In order to ensure the safe operation of the steam turbine, it is particularly important to regularly detect the surface defects of the wheel grooves.
[0003] Although electromagnetic ultrasonic transducers are non-contact and do not require coupling agents, they are one of the common means of non-destructive testing of metal materials. However, the wave packets of ultrasonic waves generated by existing electromagnetic ultrasonic transducers are usually wide. When faced with complex defects, the phase changes of sound waves at different positions in the same wave packet are inconsistent after reflection or transmission, resulting in unpredictable deformation of the reflected signal. At the same time, the wide wave packet may also cause aliasing of ultrasonic waves and reflected waves, making it difficult to distinguish the reflected signal carrying defect information, resulting in poor defect detection accuracy. Summary of the invention
[0004] The technical problem to be solved by the present invention is to provide a SH waveguide detection device and a waveguide transducer thereof.
[0005] The technical solution adopted by the present invention to solve the technical problem is: construct a waveguide transducer, comprising:
[0006] The magnetostrictive sheet is used to generate ultrasonic waves under the combined action of a static magnetic field and an alternating magnetic field, and to obtain reflected waves returned after the ultrasonic waves act on the tested object;
[0007] a static magnetic field generating unit, configured to generate the static magnetic field; and
[0008] A winding, used to generate the alternating magnetic field, and to generate a reflection signal based on the change in the magnetic field caused by the magnetostrictive sheet after the reflected wave acts on it;
[0009] The winding includes a multi-turn coil designed based on ultrasonic design parameters, and the multi-turn coil is sparsely distributed in the middle and densely distributed at both ends.
[0010] Preferably, the ultrasonic design parameters include the ultrasonic initial wave number and the ultrasonic wave number change rate;
[0011] Each of the coils is wound on the X-axis, and the coordinate expression of each of the coils is:
[0012] x n represents the coordinate of the nth coil turn in the positive semi-axis direction of the X-axis, k0 represents the initial wave number of the ultrasonic wave, a represents the rate of change of the ultrasonic wave number, f n It represents the coordinates of the nth coil turn in the negative semi-axis direction of the X-axis, where n is a natural number.
[0013] Preferably, the conductor direction of each coil forms a set angle with the direction of the static magnetic field generated by the static magnetic field generating unit.
[0014] Preferably, the setting angle ranges from 43° to 47°.
[0015] The present invention also provides a SH guided wave detection device, comprising:
[0016] The guided wave transducer as described above; and
[0017] The signal processing module is used to output an excitation signal that can stimulate the waveguide transducer to emit ultrasonic waves according to ultrasonic design parameters and excitation signal design parameters, and after the waveguide transducer emits the ultrasonic waves, determine whether the test piece has defects according to the reflected signal fed back by the waveguide transducer.
[0018] Preferably, the signal processing module includes a transducer controller, a transmitting amplification circuit, a receiving acquisition circuit and a duplexer;
[0019] A transducer controller, configured to output the excitation signal according to the ultrasonic design parameters and the excitation signal design parameters, and determine whether the tested piece has a defect according to the acquired received signal;
[0020] The transmitting amplifier circuit is electrically connected to the transducer controller, and is used to amplify the power of the excitation signal output by the transducer controller, and input the power-amplified excitation signal into the waveguide transducer;
[0021] A receiving and collecting circuit, electrically connected to the transducer controller, for amplifying the acquired reflection signal and outputting the received signal to the transducer controller;
[0022] A duplexer is electrically connected to the transmitting amplification circuit, the receiving acquisition circuit and the waveguide transducer, and is used to input the power-amplified excitation signal into the waveguide transducer to stimulate the waveguide transducer to emit ultrasonic waves, or output the reflected signal to the receiving acquisition circuit.
[0023] Preferably, the transducer controller comprises:
[0024] an excitation signal generating unit, configured to output the excitation signal matching the structure of the winding according to a second preset function, the ultrasonic design parameters and the excitation signal design parameters; wherein the ultrasonic design parameters include the ultrasonic initial wave number and the ultrasonic wave number change rate, and the excitation signal design parameters include the excitation signal amplitude and the guided wave group velocity; and
[0025] A detection unit is used to determine whether the tested device has defects according to the received signal.
[0026] Preferably, the second preset function is expressed as:
[0027] s(t)=A sin[k0c p +(π / a)c p 2 t 2 ];
[0028] Wherein, s(t) represents the excitation signal, k0 represents the initial wave number of the ultrasonic wave, a represents the rate of change of the ultrasonic wave number, t represents the time sequence, A represents the amplitude of the excitation signal, c p represents the guided wave group velocity.
[0029] Preferably, the transducer controller further includes:
[0030] The frequency domain filter is used to perform frequency domain filtering processing on the received signal according to a frequency domain expression matching the winding structure before determining whether the tested component has defects.
[0031] Preferably, the frequency domain expression is:
[0032] j represents an imaginary unit, and ω represents an angular velocity.
[0033] The implementation of the present invention has the following beneficial effects: providing a waveguide transducer, by designing the windings in the waveguide transducer to be sparse in the middle and densely distributed at both ends, the wave packet width of the ultrasonic wave is effectively narrowed (the wave packet of the reflected wave will also be narrowed accordingly), avoiding unpredictable deformation of the reflected signal and aliasing of multiple reflected waves, which can effectively improve the credibility of the reflected signal and help the SH waveguide detection device to more accurately realize defect detection. BRIEF DESCRIPTION OF THE DRAWINGS
[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:
[0035] Figure 1 is a schematic diagram of the structure of a waveguide transducer in some embodiments of the present invention;
[0036] Figure 2 is a schematic diagram of the structure of windings in some embodiments of the present invention;
[0037] Figure 3 is a schematic diagram of the waveforms of ultrasonic waves emitted by a waveguide transducer and the reflected waves received in some embodiments of the present invention;
[0038] Figure 4 It is a waveform diagram of the ultrasonic waves emitted by some waveguide transducers in the prior art and the reflected waves received;
[0039] Figure 5 is a schematic structural diagram of a waveguide transducer in other embodiments of the present invention;
[0040] Figure 6 is a circuit structure block diagram of a SH waveguide detection device in some embodiments of the present invention;
[0041] Figure 7 is a circuit structure block diagram of a transducer controller in some embodiments of the present invention. DETAILED DESCRIPTION
[0042] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.
[0043] It should be noted that the flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor do they have to be executed in the order described. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.
[0044] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.
[0045] The present invention provides a waveguide transducer, which is applied to a SH waveguide detection device, and helps to improve the defect detection accuracy of the SH waveguide detection device. Figure 1 As shown, the waveguide transducer may include a magnetostrictive sheet (not shown), a static magnetic field generating unit 11 and a winding 12 .
[0046] The magnetostrictive sheet is used to generate ultrasonic waves (i.e., SH guided waves) under the combined action of a static magnetic field and an alternating magnetic field, and to obtain reflected waves returned after the ultrasonic waves act on the test piece. Specifically, the magnetostrictive sheet can be made of nickel or a nickel-based alloy.
[0047] The static magnetic field generating unit 11 is used to generate a static magnetic field. Specifically, the static magnetic field generating unit 11 can be a permanent magnet or an electromagnet. The function of the static magnetic field generating unit 11 is to provide a static magnetic field with stable magnetic field intensity and direction and to generate the static magnetic field required for SH waveguide.
[0048] The winding 12 is used to generate an alternating magnetic field and generate a reflection signal based on the change in the magnetic field caused by the magnetostrictive sheet after the reflected wave acts on it. Figure 2 As shown, the winding 12 includes a multi-turn coil designed based on ultrasonic design parameters, and the multi-turn coil is sparsely distributed in the middle and densely distributed at both ends (that is, the spacing between adjacent coils is unequal).
[0049] It should be noted that when an excitation signal (AC signal) is input to the winding 12, the winding 12 will generate a periodically changing alternating magnetic field. When the magnetostrictive sheet is under the combined action of the static magnetic field and the alternating magnetic field, the magnetostrictive effect will produce periodic expansion or deformation, thereby generating vibration and generating ultrasonic waves. It is known from the relevant technology that when ultrasonic waves are emitted to the object under test, they will be reflected back (i.e., reflected waves), and the reflection of ultrasonic waves is closely related to the surface structure of the object under test. For example, when the surface of the object under test is smooth and defect-free, the waveform of the reflected wave is close to the waveform of ultrasonic waves. When there are structural defects on the surface of the object under test, ultrasonic waves will be refracted and scattered in the defective area, causing ultrasonic wave distortion (there are obvious differences in the waveform of ultrasonic waves). Therefore, the waveform of the reflected wave can characterize whether there are structural defects on the surface of the object under test. Further, when the reflected wave acts on the magnetostrictive sheet, it will disturb the internal static magnetic field of the magnetostrictive sheet, causing the magnetic field to change, and the changing magnetic field will induce a voltage signal (i.e., reflected signal) in the coil that can characterize the characteristics of the reflected wave.
[0050] In this embodiment, by designing the winding 12 to be sparse in the middle and densely distributed at both ends, it helps to narrow the wave packet width of the ultrasonic wave (the wave packet of the reflected wave will also be narrowed accordingly), avoid unpredictable deformation of the reflected signal and aliasing of multiple reflected waves, effectively improve the credibility of the reflected signal, and help the SH waveguide detection device to more accurately realize defect detection.
[0051] In some embodiments, the ultrasonic design parameters include the ultrasonic initial wave number and the ultrasonic wave number change rate. Specifically, the ultrasonic initial wave number represents the starting wave number of the ultrasonic wave emitted by the waveguide transducer, and the ultrasonic wave number change rate represents the change rate between each wave during the propagation of the ultrasonic wave.
[0052] Accordingly, if Figure 2 As shown, each coil is wound on the X-axis, and the coordinate expression of each coil is:
[0053] x n represents the coordinate of the nth coil turn in the positive semi-axis direction of the X-axis, k0 represents the initial ultrasonic wave number, a represents the rate of change of the ultrasonic wave number, and f n represents the coordinate of the nth coil turn in the negative semi-axis direction of the X-axis, where n is a natural number, and x0 = 0. In this embodiment, the coordinate of each coil turn is calculated by the coordinate expression, and the coil can be wound based on the coordinate, so as to obtain a winding 12 that is sparse in the middle and densely distributed at both ends and is bidirectionally symmetrically distributed, which helps to improve the stability of the alternating magnetic field generated by the winding 12, thereby improving the ultrasonic stability.
[0054] It should be noted that in the related art, the conductor direction of the coil included in the winding is usually consistent with the static magnetic field direction generated by the static magnetic field generating unit 11, that is, the angle between the conductor direction and the static magnetic field direction is approximately equal to 0°, which will cause the angle between the magnetic field directions of the static magnetic field and the alternating magnetic field acting on the magnetostrictive sheet to be 90°, which is not conducive to increasing the deformation vibration amplitude of the magnetostrictive sheet, which will suppress the ultrasonic wave intensity generated by the waveguide transducer. In view of this, in some embodiments, such as Figure 1 As shown, the conductor direction of each coil is at a set angle to the static magnetic field direction generated by the static magnetic field generating unit 11, thereby increasing the signal strength of the ultrasonic wave and thereby increasing the defect detection accuracy of the SH guided wave detection device. The set angle may range from 43° to 47°, and the set angle is preferably equal to 45°.
[0055] Figure 3 is a schematic diagram of the waveforms of the ultrasonic waves emitted by the waveguide transducer and the reflected waves received in some embodiments of the present invention, Figure 4 This is a schematic diagram of the waveforms of the ultrasonic waves emitted by some waveguide transducers in the prior art and the reflected waves received. By comparing Figure 3 and Figure 4 It can be seen that the wave packet width of the ultrasonic wave emitted by the waveguide transducer in the present invention and the wave packet width of the reflected wave received are significantly narrower than the wave packet width of the ultrasonic wave emitted by some waveguide transducers in the prior art and the wave packet width of the reflected wave received, and there is obvious redundancy in the time interval between the ultrasonic wave and the reflected wave in this embodiment (greater than 8ms), which can effectively avoid the aliasing of the reflected wave and the ultrasonic wave.
[0056] In some embodiments, Figure 5 As shown, the waveguide transducer may further include a substrate 14, on which the magnetostrictive sheet 13 and the static magnetic field generating unit 11 are both disposed and close to each other, and the winding 12 is disposed on the magnetostrictive sheet 13, so that the alternating magnetic field generated by the winding 12 and the static magnetic field generated by the static magnetic field generating unit 11 can stably act on the magnetostrictive sheet 13.
[0057] like Figure 6 As shown, the present invention further provides a SH waveguide detection device, which may include a waveguide transducer 1 and a signal processing module 2 provided in an embodiment of the present invention.
[0058] The signal processing module 2 is used to output an excitation signal that can excite the waveguide transducer 1 to emit ultrasonic waves according to the ultrasonic design parameters and the excitation signal design parameters. After the waveguide transducer 1 emits ultrasonic waves, it is determined whether there are defects in the test piece according to the reflected signal fed back by the waveguide transducer 1.
[0059] Specifically, the signal processing module 2 first obtains the ultrasonic design parameters and the excitation signal design parameters, and then outputs an excitation signal that can excite the winding 12 in the waveguide transducer 1 to generate an alternating magnetic field according to the ultrasonic design parameters and the excitation signal design parameters. Since the alternating magnetic field and the alternating magnetic field generated by the static magnetic field generating unit 11 in the waveguide transducer 1 act together on the magnetostrictive sheet in the waveguide transducer 1, the magnetostrictive sheet is deformed and vibrated, thereby generating ultrasonic waves. After reaching the object under test, the emitted ultrasonic wave will be reflected back, forming a reflected wave containing surface defect information of the object under test. When the reflected wave acts on the magnetostrictive sheet, the static magnetic field in the magnetostrictive sheet will change, and then the winding 12 will induce a reflected signal containing surface defect information of the object under test, so that the signal processing module 2 can use the reflected signal to determine whether there are structural defects in the object under test. It should be noted that the main improvement of this embodiment is to optimize the structure of the winding 12 so that the waveguide transducer can generate ultrasonic waves with narrower wave packets. The specific algorithm of the SH waveguide detection device to realize defect detection based on the reflected signal can refer to the existing technology and will not be repeated here.
[0060] Furthermore, in some embodiments, Figure 6 As shown, the signal processing module 2 may include a transducer controller 21 , a transmitting amplifying circuit 22 , a receiving collecting circuit 23 and a duplexer 24 .
[0061] The transducer controller 21 is used to output an excitation signal according to the ultrasonic design parameters and the excitation signal design parameters, and determine whether the test piece has a defect according to the acquired receiving signal.
[0062] In some embodiments, Figure 7 As shown, the transducer controller 21 may include an excitation signal generating unit 211 and a detecting unit 212 .
[0063] The excitation signal generating unit 211 is used to output an excitation signal matching the structure of the winding according to the second preset function, ultrasonic design parameters and excitation signal design parameters; wherein the ultrasonic design parameters include the ultrasonic initial wave number and the ultrasonic wave number change rate, and the excitation signal design parameters include the excitation signal amplitude and the guided wave group velocity. Further, the second preset function is expressed as: s(t) = Asin[k0c p +(π / a)c p 2 t 2 ]; where s(t) represents the excitation signal, k0 represents the initial ultrasonic wave number, a represents the rate of change of ultrasonic wave number, t represents the time sequence, A represents the amplitude of the excitation signal, c p represents the guided wave group velocity.
[0064] It can be understood that the excitation signal generating unit 211 can output an excitation signal s(t) that matches the coil structure through programmed control, and make the excitation signal have non-dispersive characteristics, thereby suppressing the dispersion and multimodal phenomena of ultrasonic waves, which helps to simplify ultrasonic waves. This helps to improve the signal-to-noise ratio of the reflected wave and plays a positive role in improving the defect detection accuracy of the SH waveguide detection device.
[0065] The detection unit 212 is used to determine whether the tested piece has defects according to the received signal. Specifically, the detection unit 212 can implement defect detection by executing an existing defect detection algorithm based on magnetostrictive guided waves. The specific algorithm can refer to the existing technology and will not be described in detail here.
[0066] In some embodiments, Figure 7 As shown, the transducer controller 21 also includes a frequency domain filter 213. The frequency domain filter 213 is used to perform frequency domain filtering on the received signal according to a frequency domain expression matching the winding structure before determining whether the tested part has defects. The frequency domain expression is: j represents an imaginary unit, ω represents an angular velocity (equal to 2πf, where f is the frequency of the excitation signal), t represents a time sequence, and "*" represents taking a conjugate complex number. In this embodiment, the frequency domain filter 213 can be optimized based on the existing frequency domain filter (such as a Gaussian filter) based on the frequency domain expression. It can be understood that the frequency domain expression is directly related to the ultrasonic design parameters and the excitation signal design parameters, and can more effectively implement filtering in the frequency domain, which can greatly improve the signal-to-noise ratio of the received signal and improve the defect detection accuracy of the SH waveguide detection device.
[0067] The transmitting amplifier circuit 22 is electrically connected to the transducer controller 21, and is used to amplify the power of the excitation signal output by the transducer controller 21, and input the power-amplified excitation signal to the waveguide transducer 1. The transmitting amplifier circuit 22 may be an existing AC signal power amplifier circuit.
[0068] The receiving and collecting circuit 23 is electrically connected to the transducer controller 21, and is used to amplify the acquired reflected signal and output the received signal to the transducer controller 21. Since the voltage of the reflected signal induced by the winding 12 is small, it is difficult for the transducer controller 21 to directly collect it, and the receiving and collecting circuit 23 is used to amplify the voltage amplitude of the reflected signal, so that the transducer controller 21 can accurately measure the amplified reflected signal through ADC technology. Among them, the receiving and collecting circuit 23 can be an existing signal amplification circuit, such as a common-mode amplifier composed of an operational amplifier.
[0069] The duplexer 24 is electrically connected to the transmitting amplifier circuit 22, the receiving collection circuit 23 and the waveguide transducer 1. The duplexer 24 is used to input the power-amplified excitation signal to the waveguide transducer 1 to excite the waveguide transducer 1 to emit ultrasonic waves, or output the reflected signal to the receiving collection circuit 23. The duplexer 24 can be an existing duplexer.
[0070] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.
[0071] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.
[0072] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
[0073] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, the above technical features can be freely combined without departing from the concept of the present invention, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the coverage of the claims of the present invention.
Claims
1. A waveguide transducer, characterized in that: include: The magnetostrictive sheet is used to generate ultrasonic waves under the combined action of a static magnetic field and an alternating magnetic field, and to obtain reflected waves returned after the ultrasonic waves act on the object under test; A static magnetic field generating unit (11), used for generating the static magnetic field; as well as A winding (12) for generating the alternating magnetic field and generating a reflection signal based on the change in the magnetic field caused by the magnetostrictive sheet after the reflected wave acts on it; The winding (12) comprises a multi-turn coil designed based on ultrasonic design parameters, and the multi-turn coil is sparsely distributed in the middle and densely distributed at both ends.
2. The waveguide transducer according to claim 1, characterized in that: The ultrasonic design parameters include the ultrasonic initial wave number and the ultrasonic wave number change rate; Each of the coils is wound on the X-axis, and the coordinate expression of each of the coils is: x n represents the coordinate of the nth coil turn in the positive semi-axis direction of the X-axis, k0 represents the initial wave number of the ultrasonic wave, a represents the rate of change of the ultrasonic wave number, f n It represents the coordinates of the nth coil turn in the negative semi-axis direction of the X-axis, where n is a natural number.
3. The waveguide transducer according to claim 1 or 2, characterized in that: The conductor direction of each coil forms a set angle with the direction of the static magnetic field generated by the static magnetic field generating unit (11).
4. The waveguide transducer according to claim 3, characterized in that: The setting angle ranges from 43° to 47°.
5. A SH waveguide detection device, characterized in that: include: The guided wave transducer (1) according to any one of claims 1 to 4; as well as The signal processing module (2) is used to output an excitation signal capable of stimulating the waveguide transducer (1) to emit an ultrasonic wave according to ultrasonic design parameters and excitation signal design parameters, and after the waveguide transducer (1) emits the ultrasonic wave, determine whether the test piece has a defect according to a reflection signal fed back by the waveguide transducer (1).
6. The SH waveguide detection device according to claim 5, characterized in that: The signal processing module (2) comprises a transducer controller (21), a transmitting amplification circuit (22), a receiving acquisition circuit (23) and a duplexer (24); A transducer controller (21) is used to output the excitation signal according to the ultrasonic design parameters and the excitation signal design parameters, and determine whether the tested part has a defect according to the acquired received signal; a transmitting amplifier circuit (22), electrically connected to the transducer controller (21), and used to amplify the power of the excitation signal output by the transducer controller (21), and input the power-amplified excitation signal into the waveguide transducer (1); A receiving and collecting circuit (23) is electrically connected to the transducer controller (21) and is used to amplify the acquired reflection signal and output the received signal to the transducer controller (21); A duplexer (24) is electrically connected to the transmitting amplifying circuit (22), the receiving collecting circuit (23) and the waveguide transducer (1), and is used to input the power-amplified excitation signal into the waveguide transducer (1) to excite the waveguide transducer (1) to emit ultrasonic waves, or to output the reflected signal to the receiving collecting circuit (23).
7. The SH waveguide detection device according to claim 6, characterized in that: The transducer controller (21) comprises: an excitation signal generating unit (211), configured to output the excitation signal matching the structure of the winding according to a second preset function, the ultrasonic design parameters and the excitation signal design parameters; wherein the ultrasonic design parameters include an ultrasonic initial wave number and an ultrasonic wave number change rate, and the excitation signal design parameters include an excitation signal amplitude and a guided wave group velocity; and The detection unit (212) is used to determine whether the tested component has defects according to the received signal.
8. The SH waveguide detection device according to claim 7, characterized in that: The second preset function is expressed as: s(t)=Asin[k0c p +(π / a)c p 2 t 2 ]; Wherein, s(t) represents the excitation signal, k0 represents the initial wave number of the ultrasonic wave, a represents the rate of change of the ultrasonic wave number, t represents the time sequence, A represents the amplitude of the excitation signal, c p represents the guided wave group velocity.
9. The SH waveguide detection device according to claim 8, characterized in that: The energy conversion controller (21) further comprises: A frequency domain filter (213) is used to perform frequency domain filtering processing on the received signal according to a frequency domain expression matching the winding structure before determining whether the tested component has a defect.
10. The SH waveguide detection device according to claim 9, characterized in that: The frequency domain expression is: j represents an imaginary unit, and ω represents an angular velocity.