SH guided wave transducer and component parameter optimization method thereof

Abstract

The invention relates to an SH guided wave transducer and a component parameter optimization method thereof. The SH guided wave transducer comprises a conductive substrate; the magnetostrictive sensor is arranged on the conductive substrate; the shielding piece is used for shielding the alternating magnetic field; the cylindrical coil is wound on the shielding piece and generates the alternating magnetic field when powered on, the cylindrical coil comprises a bottom wire assembly, a top wire assembly, a first side wire assembly and a second side wire assembly, and the bottom wire assembly is attached to the magnetostrictive sensor; the distance increasing piece is arranged between the bottom wire assembly and the shielding piece; and the magnetic part is arranged on the conductive substrate and is opposite to the first side wire assembly. According to the invention, the ultrasonic guided wave intensity and the transduction efficiency of the SH guided wave transducer can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of waveguide transducers, and in particular to an SH waveguide transducer and a method for optimizing component parameters thereof. Background Art

[0002] In the related art, the SH waveguide transducer is usually composed of a coil, a magnet and a magnetostrictive sensor. The magnetostrictive sensor generates an inverse Widmann effect under the combined action of the alternating magnetic field provided by the coil and the static bias magnetic field provided by the magnet, thereby generating ultrasonic guided waves. The greater the magnetic field intensity acting on the magnetostrictive sensor, the higher the efficiency of generating ultrasonic guided waves. However, Figure 1 As shown, when the coil generates an alternating magnetic field, according to the right-hand rule, the direction of the alternating magnetic field generated by the coil located at the top of the magnetostrictive sensor is opposite to the direction of the alternating magnetic field generated by the coil located at the bottom of the magnetostrictive sensor. Therefore, the alternating magnetic field cancellation phenomenon will occur, resulting in the weakening of the alternating magnetic field, which reduces the generation efficiency of the ultrasonic guided wave. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a method for optimizing parameters of an SH waveguide transducer and its components.

[0004] The technical solution adopted by the present invention to solve the technical problem is: constructing a SH waveguide transducer, comprising:

[0005] Conductive substrate;

[0006] A magnetostrictive sensor is disposed on the conductive substrate;

[0007] A shielding member, used for shielding an alternating magnetic field;

[0008] a cylindrical coil, wound on the shielding member and generating the alternating magnetic field when powered on, the cylindrical coil comprising a bottom wire assembly, a top wire assembly, a first side wire assembly and a second side wire assembly, the bottom wire assembly being attached to the magnetostrictive sensor;

[0009] a distance increasing member, disposed between the bottom conductor assembly and the shielding member, for increasing the distance between the bottom conductor assembly and the top conductor assembly; and

[0010] A magnetic component is disposed on the conductive substrate and is arranged opposite to the first side conductor assembly, and is used to generate a static bias magnetic field so that when the alternating magnetic field and the static bias magnetic field act together on the magnetostrictive sensor, the second side conductor assembly of the cylindrical coil generates ultrasonic guided waves.

[0011] Preferably, the length of the shielding member is not less than the length of the cylindrical coil, and the length of the cylindrical coil is not greater than the length of the magnetostrictive sensor.

[0012] Preferably, the magnetic member is a permanent magnet, and the magnetic member is arranged so that the static bias magnetic field generated by the magnetic member is perpendicular to the alternating magnetic field.

[0013] Preferably, the shielding element is a copper sheet having a first set thickness.

[0014] Preferably, the first set thickness ranges from 0.24 mm to 0.44 mm.

[0015] Preferably, the distance extending member is an epoxy resin sheet having a second set thickness.

[0016] Preferably, the second set thickness is not less than 0.5 mm.

[0017] The present invention also constructs a component parameter optimization method, comprising:

[0018] Based on the structure of the SH waveguide transducer as described above, a simulation model capable of simulating the operation of the SH waveguide transducer is established;

[0019] Acquire design parameters to set the size parameters of each component in the simulation model according to the design parameters; wherein the design parameters include the width, length and thickness of the magnetostrictive sensor, the number of turns and length of the cylindrical coil, and the length of the shielding member;

[0020] determining a thickness of the shielding member;

[0021] The thickness of the distance extending member is set to a plurality of different setting values, and a simulation test is performed after each setting of the setting value, including: controlling the cylindrical coil in the simulation model to generate an alternating magnetic field, and collecting the voltage amplitude of the cylindrical coil in the simulation model;

[0022] The thickness of the distance extender corresponding to the maximum voltage amplitude among the voltage amplitudes obtained by performing the simulation test multiple times is determined as the optimal thickness of the distance extender.

[0023] Preferably, the step of determining the thickness of the shielding element comprises:

[0024] Obtain a set shielding coefficient, and calculate the thickness of the shielding element according to a set formula and the set shielding coefficient; wherein the set formula is expressed as:

[0025]

[0026] H represents the magnetic field strength after weakening, k represents the set shielding coefficient, H0 represents the initial magnetic field strength, ω represents the angular frequency of the alternating magnetic field, μ represents the magnetic permeability of the shielding element, γ represents the electrical conductivity of the shielding element, and x represents the thickness of the shielding element.

[0027] Preferably, the step of setting the thickness of the distance increasing member to a plurality of different setting values ​​comprises:

[0028] Get the set thickness range;

[0029] Setting the thickness of the distance extending member to the lower limit of the set thickness range;

[0030] The setting value of the thickness of the distance extending member is gradually increased based on the setting step length until the setting value is equal to or greater than the upper limit value of the setting thickness range, so as to obtain a plurality of the setting values.

[0031] The technical solution of the present invention weakens the mutual cancellation effect of the alternating magnetic field generated by the top conductor assembly of the cylindrical coil on the alternating magnetic field generated by its bottom conductor assembly by arranging a shielding member, and also increases the distance between the shielding member and the bottom conductor assembly by arranging a distance extending member, thereby reducing the influence of the eddy current generated by the shielding member under the action of the magnetic field on the alternating magnetic field generated by the bottom conductor assembly, and can effectively increase the intensity of the alternating magnetic field generated by the bottom conductor assembly acting on the magnetostrictive sensor, which not only improves the ultrasonic guided wave intensity, but also improves the conversion efficiency of the SH guided wave transducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0033] Figure 1 It is a structural schematic diagram of a SH waveguide transducer in the related art;

[0034] Figure 2 is a schematic diagram of the structure of an SH waveguide transducer in some embodiments of the present invention;

[0035] Figure 3 yes Figure 2 A schematic diagram of the structure of the magnetostrictive sensor, cylindrical coil and magnetic member;

[0036] Figure 4 yes Figure 2 A schematic diagram of the structure of a magnetostrictive sensor, a shield and a cylindrical coil;

[0037] Figure 5 is a flowchart of a component parameter optimization method in some embodiments of the present invention;

[0038] Figure 6is a magnetic flux density distribution diagram when a simulation model generates ultrasonic guided waves in some embodiments of the present invention;

[0039] Figure 7 This is a curve showing the change of the eddy current density of the shielding member with the thickness of the distance extending member at different thicknesses in some embodiments of the present invention. DETAILED DESCRIPTION

[0040] 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.

[0041] In the following description, it is necessary to understand that the directions or positional relationships indicated by “front”, “back”, “up”, “down”, “left”, “right”, “longitudinal”, “horizontal”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “head”, and “tail”, etc., are based on the directions or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific direction. They are only for the convenience of describing the technical solution, and do not indicate that the device or element referred to must have a specific direction. Therefore, they should not be understood as limiting the present invention.

[0042] The present invention provides an SH waveguide transducer, which can efficiently generate ultrasonic guided waves. Figure 2 The SH waveguide transducer may include a conductive substrate 1, a magnetostrictive sensor 2, a shielding member 3, a cylindrical coil 4, a distance extending member 5 and a magnetic member 6.

[0043] The conductive substrate 1 is used for carrying the magnetostrictive sensor 2 , the shielding component 3 , the cylindrical coil 4 , the distance extending component 5 and the magnetic component 6 .

[0044] Preferably, the conductive substrate 1 is an aluminum plate, which not only has the advantages of low density, high strength, and good heat dissipation, but also has excellent electromagnetic properties, which can improve the excitation and receiving efficiency of ultrasonic guided waves and help improve the performance of SH guided wave transducers. Of course, the conductive substrate 1 can also be a conductive plate made of other conductive materials.

[0045] See also Figure 2 The magnetostrictive sensor 2 is arranged on the conductive substrate 1. The magnetostrictive sensor 2 is preferably an existing magnetostrictive sheet, such as a magnetostrictive sheet made of an iron-cobalt alloy.

[0046] The shielding member 3 is used to shield the alternating magnetic field generated when the cylindrical coil 4 is energized.

[0047] Optionally, the shielding member 3 may be a sheet-like structural member made of a material having a magnetic field shielding function and being non-ferromagnetic. The material having a magnetic field shielding function and having a low magnetic permeability includes, but is not limited to, copper, aluminum, copper-aluminum alloy, etc. It should be noted that since the magnetostrictive sensor 2 needs to work under the action of a magnetic field, if the shielding member 3 is ferromagnetic, it may affect the operation of the magnetostrictive sensor 2. Copper has the advantages of good electromagnetic shielding performance and low cost, so the shielding member 3 is preferably a copper sheet with a first set thickness, wherein the first set thickness may range from 0.24 mm to 0.44 mm.

[0048] See also Figure 2 The cylindrical coil 4 is wound on the shielding member 3 and generates the alternating magnetic field when powered. Figure 3 The cylindrical coil 4 includes a bottom wire assembly 41 (equivalent to the bottom of the cylindrical coil 4), a top wire assembly 42 (equivalent to the top of the cylindrical coil 4), a first side wire assembly 43 and a second side wire assembly 44. The bottom wire assembly 41 is attached to the magnetostrictive sensor 2, so that the bottom wire assembly 41 of the cylindrical coil 4 can be as close to the magnetostrictive sensor 2 as possible, so that the magnetic field intensity of the alternating magnetic field of the magnetostrictive sensor 2 caused by the bottom wire assembly 41 is as large as possible, which helps to improve the intensity of the ultrasonic guided wave generated by the magnetostrictive sensor 2.

[0049] It can be understood that under the action of the shielding member 3, the mutual cancellation effect of the alternating magnetic field generated by the top wire assembly 42 on the alternating magnetic field generated by the bottom wire assembly 41 can be weakened, that is, the shielding member 3 is equivalent to isolating the magnetic fields generated by the bottom wire assembly 41 and the top wire assembly 42, which helps to increase the intensity of the alternating magnetic field generated by the bottom wire assembly 41 acting on the magnetostrictive sensor 2, thereby improving the ultrasonic guided wave intensity and the conversion efficiency of the SH guided wave transducer.

[0050] See also Figure 2 The distance extending member 5 is arranged between the bottom conductor assembly 41 and the shielding member 3 to increase the distance between the bottom conductor assembly 41 and the top conductor assembly 42. When the cylindrical coil 4 generates an alternating magnetic field, eddy currents will also be generated in the shielding member 3, causing the eddy currents to have an adverse effect on the alternating magnetic field generated by the bottom conductor assembly 41. The distance extending member 5 is arranged between the bottom conductor assembly 41 and the shielding member 3 to increase the distance from the shielding member 3 to the bottom conductor assembly 41, thereby reducing the influence of the eddy currents, which plays a positive role in improving the performance and stability of the SH waveguide transducer.

[0051] Optionally, the distance extending member 5 may be an epoxy resin sheet with a second set thickness, wherein the second set thickness is not less than 0.5 mm, so as to ensure that the bottom wire assembly 41 is at a certain distance from the shielding member 3, and the shielding effect of the shielding member 3 on the magnetic field generated by the bottom wire assembly 41 is as weak as possible.

[0052] To ensure that the shielding member 3 can have a good effect on the magnetic field generated by the top conductor assembly 42, in some embodiments, the length E1 of the shielding member 3 is configured to be no less than the length C1 of the cylindrical coil 4. Figure 4 As shown, the cylindrical coil 4 is wound in the middle of the shield 3, so that the shortest distances (A1 and A2) from the two end faces of the shield 3 to the cylindrical coil 4 are not less than 5 mm. Preferably, the cylindrical coil 4 is symmetrically distributed with respect to the center of the shield 3 (i.e., the distances A1 and A2 are equal).

[0053] See also Figure 2 The magnetic component 6 is arranged on the conductive substrate 1 and is arranged opposite to the first side wire component 43. The magnetic component 6 is used to generate a static bias magnetic field so that when the alternating magnetic field and the static bias magnetic field act together on the magnetostrictive sensor 2, the second side wire component 44 of the cylindrical coil 4 generates ultrasonic guided waves.

[0054] Optionally, the magnetic member 6 may be a block structure made of a magnetic material, including but not limited to iron, cobalt, nickel, nickel alloy, cobalt alloy, etc. The magnetic member 6 is preferably a permanent magnet, and the magnetic member 6 is configured so that the static bias magnetic field generated by it is perpendicular to the alternating magnetic field (see Figure 1 ) to enhance the interaction effect between the static bias magnetic field and the alternating magnetic field, which helps to improve the conversion efficiency of the SH waveguide transducer.

[0055] To ensure that the magnetostrictive sensor 2 can more efficiently utilize the alternating magnetic field generated by the cylindrical coil 4 and the static bias magnetic field generated by the magnetic member 6 to generate ultrasonic guided waves and improve the energy conversion efficiency of the SH guided wave transducer, in some embodiments, as Figure 3 As shown, the length D1 of the magnetostrictive sensor 2 is not less than the length C1 of the cylindrical coil 4, and is not greater than the length F1 of the magnetic member 6. Further, the cylindrical coil 4 is disposed above the middle of the magnetostrictive sensor 2, and the shortest distances (B1 and B2) from the two end faces of the magnetostrictive sensor 2 to the cylindrical coil 4 are not less than 5 mm. Preferably, the cylindrical coil 4 is symmetrically distributed with respect to the center of the magnetostrictive sensor 2 (i.e., the distances B1 and A2 are equal).

[0056] It can be understood that the technical solution of the present invention weakens the mutual cancellation effect of the alternating magnetic field generated by the top conductor assembly of the cylindrical coil on the alternating magnetic field generated by its bottom conductor assembly by providing a shielding member, and also increases the distance between the shielding member and the bottom conductor assembly by providing a distance-increasing member, thereby reducing the influence of the eddy current generated by the shielding member under the action of the magnetic field on the alternating magnetic field generated by the bottom conductor assembly, and can effectively increase the intensity of the alternating magnetic field generated by the bottom conductor assembly acting on the magnetostrictive sensor, thereby not only improving the ultrasonic guided wave intensity, but also improving the conversion efficiency of the SH guided wave transducer.

[0057] The present invention also provides a component parameter optimization method for determining the optimal thickness of the distance extending member 5 included in the SH waveguide transducer provided in the embodiment of the present invention, thereby ensuring the performance of the SH waveguide transducer. Figure 5 As shown, the component parameter optimization method may include step S10, step S20, step S30, step S40 and step S50.

[0058] Step S10 includes: establishing a simulation model capable of simulating the operation of the SH waveguide transducer based on the structure of the SH waveguide transducer provided in the embodiment of the present invention. Specifically, the structure of the simulation model can refer to Figure 2 The simulation model is used to simulate the ultrasonic guided waves generated by the components of the SH waveguide transducer under specific parameters. Figure 6 It can be understood that the simulation model can be used to facilitate the debugging of the component parameters of the SH waveguide transducer, so as to determine the parameters of each component corresponding to the SH waveguide transducer when the effect meets the requirements or is even optimal. Among them, the simulation model can be established by COMSOL Multiphysics software of COMSOL Company, and related simulation work can be performed. For how to use COMSOL Multiphysics software to realize simulation work, please refer to the tutorial provided by COMSOL Company, which will not be repeated here.

[0059] Step S20 includes: obtaining design parameters to set the size parameters of each component in the simulation model according to the design parameters; wherein the design parameters include the width, length and thickness of the magnetostrictive sensor 2, the coil wire diameter, number of turns and length of the cylindrical coil 4, the length of the shield 3, and the length and thickness of the conductive substrate 1. The purpose of this step is to set some parameters that have relatively little effect on the mutual cancellation phenomenon of the alternating magnetic field generated by the bottom wire assembly 41 and the top wire assembly 42 when powered on, so as to simplify the simulation work. For example, the width of the magnetostrictive sensor 2 can be designed to be 8mm, the length can be designed to be 20mm, and the thickness can be designed to be 0.1mm, the coil wire diameter of the cylindrical coil 4 can be designed to be 0.35mm, the number of turns can be designed to be 20 turns, and the length can be designed to be 10mm, the length of the shield 3 can be designed to be 20mm, and the length of the conductive substrate 1 can be designed to be 40mm and the thickness can be designed to be 2mm.

[0060] Furthermore, the staff can set the design parameters by operating the human-computer interaction unit (such as a mouse, keyboard). When the effect of the SH waveguide transducer cannot be adjusted to meet the set requirements by adjusting the thickness of the shielding member 3 and the distance increasing member 5, the performance of the SH waveguide transducer can also be adjusted by adjusting the design parameters. For example, adjusting the number of turns of the cylindrical coil 4 can directly adjust the effect of the alternating magnetic field.

[0061] Step S30 includes: determining the thickness of the shielding element 3 .

[0062] In some embodiments, the step of determining the thickness of the shielding member 3 may include: obtaining a set shielding coefficient, and calculating the thickness of the shielding member 3 according to a set formula and the set shielding coefficient; wherein the set formula is expressed as: H represents the intensity of the weakened magnetic field. k represents the set shielding coefficient, which can be set by operating the human-machine interaction unit. H0 represents the initial magnetic field intensity. ω represents the angular frequency of the alternating magnetic field, ω=2πf, f is the frequency of the alternating current input to the cylindrical coil 4, when f is 200kH, ω can be pre-stored as 1.256637×10 6 s -1 μ represents the magnetic permeability of the shielding element 3, and μ can be pre-stored as 1.2566×10 -6 H / m. γ represents the conductivity of the shielding member 3, and γ can be pre-stored as 5.80×10 7 S / m. x represents the thickness of the shielding member 3. In this embodiment, the thickness x of the shielding member 3 can be calculated based on the set formula.

[0063] It can be understood that setting the shielding coefficient k is equivalent to designing the shielding effect of the shielding member 3. For example, when k is set to 0.1, it is equivalent to that under the action of the shielding member 3, the magnetic field strength generated by the top wire component 42 on the side of the shielding member 3 close to the bottom wire component 41 will be weakened to 0.1 times the magnetic field strength on the side close to the top wire component 42, which is equivalent to setting the action target of the shielding member 3.

[0064] Optionally, the shielding coefficient is set to 0.1. Accordingly, when the shielding coefficient is set to 0.1, the thickness of the shielding element 3 is 0.34 mm.

[0065] Step S40 includes: setting the thickness of the distance extender 5 to multiple different setting values, and performing a simulation test after each setting value, including: controlling the cylindrical coil 4 in the simulation model to generate an alternating magnetic field, and collecting the voltage amplitude of the cylindrical coil 4 in the simulation model. Specifically, COMSOL Multiphysics software can be used to simulate the input of an alternating current with a frequency of 200 kHz into the cylindrical coil 4, so that the cylindrical coil 4 generates an alternating magnetic field. Under the combined action of the alternating magnetic field generated by the bottom wire assembly 41 and the static bias magnetic field, the magnetostrictive sensor 2 in the simulation model will generate an ultrasonic guided wave (i.e., SH wave). When the ultrasonic guided wave propagates in the conductive substrate 1, it will cause the particles in the conductive substrate 1 (i.e., the aluminum plate) to vibrate, and the vibration will drive the magnetostrictive sensor 2 to vibrate and deform. Due to the vibration and deformation of the magnetostrictive sensor 2, the magnetic field distribution in the magnetostrictive sensor 2 will change, thereby causing the magnetic field to change, and the changing magnetic field will induce a voltage signal (equivalent to the induced voltage) in the cylindrical coil 4, because the ultrasonic guided wave intensity is positively correlated with the vibration intensity of the conductive substrate 1 (equivalent to the vibration intensity of the magnetostrictive sensor 2), and the induced voltage is positively correlated with the vibration intensity of the magnetostrictive sensor 2, that is, the voltage amplitude has a positive correlation with the ultrasonic guided wave intensity.

[0066] In some embodiments, the step of setting the thickness of the distance extender 5 to a plurality of different setting values ​​may include: obtaining a set thickness range; setting the thickness of the distance extender 5 to the lower limit of the set thickness range; gradually increasing the setting value of the thickness of the distance extender 5 based on the set step length until the setting value is equal to or greater than the upper limit of the set thickness range, so as to obtain a plurality of setting values. Specifically, assuming that the set thickness range is L to H and the set step length is P, when implementing this embodiment, the thickness of the distance extender 5 will start from L and gradually increase, and each incremental value is P, until the thickness of the distance extender 5 is equal to or greater than H, the incremental value will stop increasing, and each incremental value is used as a setting value, so that the plurality of different setting values ​​obtained include L, L+P, L+2*P, L+3*P, ..., L+(n-1)*P (the value is less than H), L+n*P (the value is greater than or equal to H), and n is a natural number.

[0067] Optionally, the thickness range is set to 0.5 mm to 7 mm, and the step length is set to 0.5 mm. Further, the thickness range and the step length can be set by operating the human-computer interaction unit.

[0068] Step S50 includes: determining the set thickness of the distance extender 5 corresponding to the maximum voltage amplitude among the voltage amplitudes obtained by performing multiple simulation tests as the optimal thickness of the distance extender 5. It can be understood that since the ultrasonic guided wave has a positive correlation with the voltage amplitude, in this step, the set thickness of the distance extender 5 corresponding to the maximum voltage amplitude can be determined as the optimal thickness of the distance extender 5.

[0069] Figure 7 It is a curve showing the change of the eddy current density of the shielding member 3 with the thickness of the distance extender 5 in some embodiments of the present invention. It can be seen that as the thickness of the distance extender 5 increases, the eddy current on the lower surface of the shielding member 3 can be reduced, thereby reducing the influence of the eddy current on the alternating magnetic field generated by the bottom conductor assembly 41.

[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 SH waveguide transducer, characterized in that: include: A conductive substrate (1); A magnetostrictive sensor (2) is arranged on the conductive substrate (1); A shielding member (3) for shielding an alternating magnetic field; a cylindrical coil (4), which is wound on the shielding member (3) and generates the alternating magnetic field when powered on, the cylindrical coil (4) comprising a bottom wire assembly, a top wire assembly, a first side wire assembly and a second side wire assembly, the bottom wire assembly being attached to the magnetostrictive sensor (2); A distance increasing member (5) is arranged between the bottom conductor assembly and the shielding member (3) and is used to increase the distance between the bottom conductor assembly and the top conductor assembly; as well as A magnetic component (6) is disposed on the conductive substrate (1) and is arranged opposite to the first side conductor assembly, and is used to generate a static bias magnetic field so that when the alternating magnetic field and the static bias magnetic field act together on the magnetostrictive sensor (2), the second side conductor assembly of the cylindrical coil (4) generates ultrasonic guided waves.

2. The SH waveguide transducer according to claim 1, characterized in that: The length of the shielding member (3) is not less than the length of the cylindrical coil (4), and the length of the cylindrical coil (4) is not greater than the length of the magnetostrictive sensor (2).

3. The SH waveguide transducer according to claim 1, characterized in that: The magnetic component (6) is a permanent magnet, and the magnetic component (6) is arranged so that the static bias magnetic field generated by it and the alternating magnetic field are perpendicular to each other.

4. The SH waveguide transducer according to any one of claims 1 to 3, characterized in that: The shielding element (3) is a copper sheet having a first set thickness.

5. The SH waveguide transducer according to claim 4, characterized in that: The first set thickness ranges from 0.24 mm to 0.44 mm.

6. The SH waveguide transducer according to claim 4, characterized in that: The distance increasing member (5) is an epoxy resin sheet having a second set thickness.

7. The SH waveguide transducer according to claim 6, characterized in that: The second set thickness is not less than 0.5 mm.

8. A component parameter optimization method, characterized in that: include: Based on the structure of the SH waveguide transducer according to any one of claims 1 to 7, a simulation model capable of simulating the operation of the SH waveguide transducer is established; Acquiring design parameters to set the dimension parameters of each component in the simulation model according to the design parameters; wherein the design parameters include the width, length and thickness of the magnetostrictive sensor (2), the number of turns and length of the cylindrical coil (4), and the length of the shielding member (3); Determining the thickness of the shielding member (3); The thickness of the distance increasing member (5) is set to a plurality of different setting values, and a simulation test is performed after each setting of the setting value, including: controlling the cylindrical coil (4) in the simulation model to generate an alternating magnetic field, and collecting the voltage amplitude of the cylindrical coil (4) in the simulation model; The setting thickness of the distance extending member (5) corresponding to the maximum voltage amplitude among the voltage amplitudes obtained by performing the simulation test multiple times is determined as the optimal thickness of the distance extending member (5).

9. The component parameter optimization method according to claim 8, characterized in that: The step of determining the thickness of the shielding member (3) comprises: A set shielding coefficient is obtained, and the thickness of the shielding element (3) is calculated according to a set formula and the set shielding coefficient; wherein the set formula is expressed as: H represents the magnetic field strength after weakening, k represents the set shielding coefficient, H0 represents the initial magnetic field strength, ω represents the angular frequency of the alternating magnetic field, μ represents the magnetic permeability of the shielding element (3), γ represents the electrical conductivity of the shielding element (3), and x represents the thickness of the shielding element (3).

10. The component parameter optimization method according to claim 8, characterized in that: The step of setting the thickness of the distance increasing member (5) to a plurality of different setting values ​​comprises: Get the set thickness range; Setting the thickness of the distance increasing member (5) to the lower limit value of the set thickness range; The setting value of the thickness of the distance extending member (5) is gradually increased based on the setting step length until the setting value is equal to or greater than the upper limit value of the setting thickness range, so as to obtain a plurality of the setting values.

Images