Separate measurement double-wave transducer

Abstract

The utility model relates to a separate measurement double-wave transducer, which comprises a shell, a piezoelectric sensor and an electromagnetic ultrasonic sensor, and is characterized in that the shell defines an accommodating space, and the accommodating space comprises a first opening part and a second opening part; the piezoelectric sensor is arranged in the accommodating space, and the first opening part exposes the detection surface of the piezoelectric sensor; the electromagnetic ultrasonic sensor is arranged in the accommodating space, the second opening part exposes the detection surface of the electromagnetic ultrasonic sensor, and the piezoelectric sensor and the electromagnetic ultrasonic sensor are integrated in the same shell, so that bolt test piece signals can be measured more conveniently, and transverse waves and longitudinal waves with the optimal signal-to-noise ratio can be screened out; and the measurability of the bolt axial force and the accuracy of the measured value are ensured.

Description

A dual-wave transducer Technical Field

[0001] This application relates to the field of industrial testing technology, and in particular to a dual-wave transducer for separate testing. Background Technology

[0002] Currently, bolt axial force measurement mainly employs ultrasonic transducer technology, including three methods: single transverse wave, single longitudinal wave, and dual-wave measurement. However, all of these methods have significant limitations in practical applications. Piezoelectric ultrasonic transducers have a simple structure but can only excite a single mode of transverse or longitudinal wave signal. Single-wave measurement requires separate measurements of the zero point and the result value, making the process cumbersome and inefficient. While electromagnetic ultrasonic transducers can simultaneously excite transverse and longitudinal wave signals, allowing for single-measurement result acquisition, and theoretically offer high measurement efficiency, under complex working conditions, due to the non-axial forces acting on the bolt, one waveform often exhibits good signal quality while the other is of poor quality. This leads to attenuation or distortion of the transverse or longitudinal wave signals, resulting in a significant decrease in the signal-to-noise ratio or even signal loss, severely impacting the reliability and accuracy of the measurement results. These technical shortcomings pose significant challenges to existing bolt axial force measurement methods in industrial applications, necessitating the development of new solutions to improve signal quality and measurement reliability. Summary of the Invention

[0003] To address the above problems, this application provides a dual-wavelength transducer, comprising:

[0004] The outer shell encloses a receiving space, the receiving space including a first opening and a second opening;

[0005] A piezoelectric sensor is disposed within the accommodating space, and the first opening exposes the detection surface of the piezoelectric sensor; and

[0006] An electromagnetic ultrasonic sensor is disposed within the accommodating space, and the second opening exposes the detection surface of the electromagnetic ultrasonic sensor.

[0007] Furthermore, the piezoelectric sensor includes a sound guide plate, a piezoelectric crystal, and a signal processing circuit arranged sequentially from the first opening toward the second opening.

[0008] Furthermore, the electromagnetic ultrasonic sensor includes a magnet and an electromagnetic induction coil, the electromagnetic induction coil being disposed at one end of the magnet near the second opening, and the outer side of the electromagnetic induction coil being adapted to the second opening.

[0009] Furthermore, the electromagnetic ultrasonic sensor also includes a magnet retaining ring, which is disposed between the outer wall of the magnet and the inner wall of the housing to fix the position of the magnet within the accommodating space.

[0010] Furthermore, the electromagnetic ultrasonic sensor also includes an absorbing plate, which is disposed between the magnet and the electromagnetic induction coil.

[0011] Furthermore, the dual-wave transducer also includes a cover disposed on the first opening.

[0012] Furthermore, the cover includes a hollow portion in the middle, the piezoelectric sensor is fixed to the hollow portion, and the outer side of the piezoelectric sensor is adapted to the hollow portion.

[0013] Furthermore, the dual-wave transducer also includes a partition disposed inside the housing, the partition separating the piezoelectric sensor from the electromagnetic ultrasonic sensor.

[0014] Furthermore, the dual-wave transducer also includes a wire fixing clamp, and the housing also includes a third opening, to which the wire fixing clamp is connected.

[0015] Furthermore, the accommodating space is cylindrical, and the piezoelectric sensor and the electromagnetic ultrasonic sensor are coaxially arranged with the central axis of the housing as the axis.

[0016] This application relates to a dual-wave transducer for separate measurement, comprising a housing, a piezoelectric sensor, and an electromagnetic ultrasonic sensor. The housing encloses a receiving space, which includes a first opening and a second opening. The piezoelectric sensor is disposed within the receiving space, with the first opening exposing the detection surface of the piezoelectric sensor. The electromagnetic ultrasonic sensor is disposed within the receiving space, with the second opening exposing the detection surface of the electromagnetic ultrasonic sensor. By integrating the piezoelectric sensor and the electromagnetic ultrasonic sensor into the same housing, it is more convenient to separate the signals of bolt specimens, thereby filtering out the transverse and longitudinal waves with the optimal signal-to-noise ratio, ensuring the measurability of bolt axial force and the accuracy of the measured values. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the dual-wave transducer of this application;

[0018] Figure 2 is an exploded view of the dual-wave transducer of this application.

[0019] Figure 3 is a cross-sectional view of the outer casing of this application;

[0020] Figure 4 is a schematic diagram of the shell cover of this application;

[0021] Figure 5 is a cross-sectional view of the split-wave transducer.

[0022] Explanation of reference numerals in the attached figures

[0023] 10. Dual-wave transducer; 1. Housing; 11. Housing cover; 111. Hollowed-out section; 112. First part of housing cover; 113. Second part of housing cover; 12. Partition; 13. First opening; 14. Second opening; 15. Third opening; 21. Sound guide plate; 22. Piezoelectric crystal; 23. Signal processing circuit; 2. Piezoelectric sensor; 3. Electromagnetic ultrasonic sensor; 31. Magnet; 32. Electromagnetic induction coil; 33. Magnet retaining ring; 34. Wave absorbing sheet; 35. Wear-resistant sheet; 4. Wire fixing clamp. Detailed Implementation

[0024] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0025] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0026] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0027] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0029] To provide a better understanding of the purpose, structure, features, and functions of this application, detailed descriptions are provided below with reference to specific embodiments.

[0030] To address the aforementioned issues, this application provides a dual-wavelength transducer 10, comprising a housing 1, a piezoelectric sensor 2, and an electromagnetic ultrasonic sensor 3. The housing 1 encloses a receiving space, which includes a first opening 13 and a second opening 14. The piezoelectric sensor 2 is disposed within the receiving space, with the first opening 13 exposing the detection surface of the piezoelectric sensor 2. The electromagnetic ultrasonic sensor 3 is disposed within the receiving space, with the second opening 14 exposing the detection surface of the electromagnetic ultrasonic sensor 3.

[0031] The outer casing 1 forms an accommodating space, providing a stable installation environment for the components inside the casing 1 and mechanically protecting them. The outer casing 1 has a first opening 13 and a second opening 14. The positions of the first opening 13 and the second opening 14 are not specifically limited in this application. The piezoelectric sensor 2 is installed inside the accommodating space, and its detection surface is exposed through the first opening 13. It is used to transmit and / or receive a single mode of ultrasonic waves, including transverse waves and / or longitudinal waves. That is, the piezoelectric sensor 2 can contact the surface of the object to the north without obstruction through the first opening 13 and successfully complete the transmission and / or reception of ultrasonic waves. The electromagnetic ultrasonic sensor 3 is installed inside the accommodating space formed by the outer casing 1 along with the piezoelectric sensor 2. The detection surface of the electromagnetic ultrasonic sensor 3 is exposed through the second opening 14. The electromagnetic ultrasonic sensor 3 simultaneously excites electromagnetic transverse and longitudinal waves through the second opening 14 and directly interacts with the object under test.

[0032] The dual-wave transducer 10 of this application integrates a piezoelectric sensor 2 and an electromagnetic ultrasonic sensor 3 into a housing 1, and reasonably sets an opening to expose its detection surface. This achieves an organic combination of two sensors with different principles in structure, giving full play to their respective advantages in ultrasonic detection, so as to more conveniently measure the bolt specimen signal, thereby screening out the transverse wave and longitudinal wave with the best signal-to-noise ratio, and ensuring the measurability of bolt axial force and the accuracy of the measured value.

[0033] In this application, the separate measurement scheme can be that the electromagnetic ultrasonic sensor 3 excites transverse waves and longitudinal waves; or the electromagnetic ultrasonic sensor 3 excites transverse waves and the piezoelectric sensor 2 excites longitudinal waves, or the electromagnetic ultrasonic sensor 3 excites longitudinal waves and the piezoelectric sensor 2 excites transverse waves.

[0034] The detection surfaces of the piezoelectric sensor 2 and the electromagnetic ultrasonic sensor 3 are set inside the same housing 1 and exposed through different openings, which can adapt to different detection needs, such as time-division measurement or synchronous measurement. At the same time, the housing 1 integrates the piezoelectric sensor 2 and the electromagnetic ultrasonic sensor 3, which can reduce external interference, effectively filter out the transverse and longitudinal waves with the best signal-to-noise ratio, and improve portability and environmental adaptability.

[0035] The piezoelectric sensor 2 includes a sound guide plate 21, a piezoelectric crystal 22, and a signal processing circuit 23 arranged sequentially from the first opening 13 toward the second opening 14.

[0036] The sound guide plate 21 is closest to the first opening 13. The sound guide plate 21 guides and transmits sound waves, effectively receiving sound wave signals from the bolt or other object being measured and transmitting them to the next layer, the piezoelectric wafer 22. Generally, the sound guide plate 21 is made of a material with good sound wave transmission properties to ensure accurate transmission of sound wave signals.

[0037] The piezoelectric crystal 22 is located adjacent to the sound guide plate 21. When it receives the sound wave signal transmitted by the sound guide plate 21 and undergoes mechanical vibration, the surface of the piezoelectric crystal 22 generates an electric charge and outputs an electrical signal. The signal processing circuit 23 is mainly used to receive and process the electrical signal from the piezoelectric crystal 22. It can amplify, filter, and convert the electrical signal to facilitate subsequent selection of transverse and longitudinal waves with the optimal signal-to-noise ratio.

[0038] Specifically, when the bolt is subjected to axial force, its internal lattice structure undergoes elastic deformation. The slight elastic deformation disrupts the dynamic balance between the internal atoms, causing the interaction force between the atoms to change periodically. This generates acoustic signals, including transverse and longitudinal waves, inside the bolt. These acoustic signals propagate inside the bolt, through the bolt material to the transducer's sound guide plate 21, and then through the sound guide plate 21 to the piezoelectric crystal 22.

[0039] The sound guide plate 21 couples the longitudinal or transverse wave propagating in the bolt to the piezoelectric crystal 22. When the piezoelectric crystal 22 receives the mechanical vibration generated by the sound wave transmitted by the sound guide plate 21, it converts the deformation into a charge signal through the inverse piezoelectric effect. The signal processing circuit 23 converts the charge signal into a voltage signal to filter the transverse and longitudinal waves with the best signal-to-noise ratio.

[0040] The piezoelectric sensor 2 of this application realizes the transmission, conversion and processing of sound wave signals through the sequential arrangement of the sound guide plate 21, the piezoelectric crystal 22 and the signal processing circuit 23, thereby enabling accurate measurement and analysis of parameters such as bolt axial force.

[0041] The electromagnetic ultrasonic sensor 3 includes a magnet 31 and an electromagnetic induction coil 32. The electromagnetic induction coil 32 is disposed at one end of the magnet 31 near the second opening 14, and the outer side of the electromagnetic induction coil 32 is adapted to the second opening 14.

[0042] In comparison, the electromagnetic induction coil 32 is closer to the second opening 14 and makes close contact with the object being measured through the second opening 14. That is, the second opening 14 exposes the electromagnetic induction coil 32 first. The outer edge size of the electromagnetic induction coil 32 is adapted to the size of the second opening 14. This ensures that the electromagnetic induction coil 32 can effectively receive and transmit ultrasonic signals, while making the structure of the electromagnetic ultrasonic sensor 3 and the housing 1 more compact and stable.

[0043] In bolt axial force measurement, a high-frequency alternating current is passed through the electromagnetic induction coil 32 of the electromagnetic ultrasonic sensor 3, generating an alternating magnetic field on the bolt surface. According to Faraday's law of electromagnetic induction, this magnetic field induces a current on the bolt surface. The interaction between the alternating magnetic field and the induced current generates a Lorentz force, causing high-frequency vibrations of the particles on the bolt surface, thereby exciting ultrasonic waves. When the ultrasonic waves propagate to the bolt surface, the particle vibrations cause local magnetic field changes, inducing an electrical signal in the sensor coil, thus achieving ultrasonic wave reception. The stress state of the bolt is assessed by exciting and receiving ultrasonic signals. When a bolt is subjected to force, it will undergo minute deformations or strains, which affect the propagation speed and path of the ultrasonic waves. By analyzing the changes in the reflected ultrasonic signals, the magnitude and direction of the bolt axial force can be inferred.

[0044] The electromagnetic ultrasonic sensor 3 also includes a magnet retaining ring 33, which is disposed between the outer wall of the magnet 31 and the inner wall of the housing 1 to fix the position of the magnet 31 in the accommodating space.

[0045] The magnet retaining ring 33 is located between the outer wall of the magnet 31 and the inner wall of the housing 1, forming a stable support structure with interference fit, ensuring that the magnet 31 maintains a stable position within the accommodating space. This helps prevent the magnet 31 from moving or shifting during sensor operation.

[0046] The thickness of the magnet retaining ring 33 is less than the thickness of the magnet 31, that is, along the axial direction, the height of the magnet retaining ring 33 is less than the height of the magnet 31.

[0047] The magnet fixing ring 33 is made of magnetically conductive material. Through size and structural design, a specific magnetic circuit structure is formed, which increases the magnetic field strength of the original permanent magnet 11 and enhances the energy conversion efficiency.

[0048] Meanwhile, the magnet 31 and the magnet fixing ring 33 can be regarded as a whole, which is equivalent to increasing the outer diameter of the magnet 31 by using the magnet fixing ring 33. In other words, this embodiment can increase the outer diameter of the electromagnetic induction coil 32 as much as possible to improve the testing performance of the electromagnetic ultrasonic dual-wave transducer, that is, just make sure that the outer diameter of the electromagnetic induction coil 32 is slightly smaller than the outer diameter of the magnet 31.

[0049] The electromagnetic ultrasonic sensor 3 also includes an absorbing plate 34, which is disposed between the magnet 31 and the electromagnetic induction coil 32.

[0050] The absorbing sheet 34 is in close contact with the contact surface of the magnet 31 and the electromagnetic induction coil 32 to form a physical isolation layer. Specifically, in the magnet 31 and the electromagnetic induction coil 32 of this application, the absorbing sheet 34 is set as an annular thin sheet and embedded in the contact gap between the two. By absorbing the electromagnetic wave energy of non-working frequency, it avoids the conversion of it into interference signal and ensures that the magnetic field is evenly distributed.

[0051] Specifically, in the direction parallel to the axis of the magnet 31, the orthographic projection of the electromagnetic induction coil 32 onto the lower surface of the absorbing plate 34 is completely located within the lower surface of the absorbing plate 34, which can minimize the influence of the magnetic field generated by the electromagnetic induction coil 32 on the static magnetic field generated by the magnet 31.

[0052] The absorbing sheet 34 is bonded to the magnet 31 and the electromagnetic induction coil 32 with adhesive to ensure that the absorbing sheet 34 is tightly attached to the magnet 31 and the coil, and to avoid air gaps affecting the absorption performance. Specifically, epoxy resin adhesive can be used, or an adhesive can be selected.

[0053] The absorbing sheet 34 can be made of 1-6 layers of copper foil or magnetic sheet.

[0054] In an optional embodiment, the electromagnetic ultrasonic sensor 3 further includes a wear-resistant plate 35, which is disposed on the side of the electromagnetic induction coil 32 away from the magnet 31. The wear-resistant plate 35, the electromagnetic induction coil 32, and the absorbing plate 34 are arranged coaxially with the central axis of the magnet 31 as the axis.

[0055] The wear-resistant plate 35 also includes a first wear-resistant plate and a second wear-resistant plate, with the second wear-resistant plate disposed between the first wear-resistant plate and the electromagnetic induction coil 32. After the electromagnetic induction coil 32 is wound, the second wear-resistant plate is integrally formed with the coil frame by means of adhesive bonding, injection molding, or other fixing methods, forming a rigid connection that cannot be disassembled, thus preventing the second wear-resistant plate from falling off under high-frequency vibration.

[0056] The first wear-resistant pad is easier to disassemble and replace than the second wear-resistant pad. The first wear-resistant pad is in direct contact with the test item and is more prone to wear than the second wear-resistant pad. The first wear-resistant pad is processed independently to form a replaceable wear-resistant consumable unit.

[0057] Both the first and second wear-resistant sheets are ceramic or plastic sheets with low conductivity and low magnetic permeability. Furthermore, the wear-resistant sheet 35 is configured as a double layer. When the surface of the first wear-resistant sheet near the detection port wears down and needs replacement, the first wear-resistant sheet can be directly removed from the detection port and replaced with a new one, thus avoiding damage to the electromagnetic induction coil 32.

[0058] The second wear-resistant sheet is a plastic sheet fixed to the electromagnetic induction coil 32.

[0059] The electromagnetic induction coil 32 can be wound with enameled wire or processed using PCB technology, where the PCB can be a flexible PCB or a conventional PCB.

[0060] The dual-wave transducer 10 also includes a cover 11 that covers the first opening 13.

[0061] The cover 11 includes a first part and a second part of the cover 11 connected to each other. In the horizontal direction, the width of the first part of the cover 11 is greater than the width of the second part of the cover 11, so that the cross section of the cover 11 is T-shaped. The first part of the cover 11 is mounted on the first opening 13 of the outer shell 1, and the second part of the cover 11 protrudes from the first part of the cover 11 along the inner wall of the outer shell 1.

[0062] The cover 11 is connected to the outer shell 1 by welding, bonding, snap-fitting or integral molding, so that the cover 11 and the outer shell 1 are firmly connected.

[0063] The cover 11 includes a hollow portion 111 located in the middle, the piezoelectric sensor 2 is fixed to the hollow portion 111, and the outer side of the piezoelectric sensor 2 is adapted to the hollow portion 111.

[0064] The cutout portion 111 exposes the detection surface of the piezoelectric sensor 2. The cutout portion 111 serves as a channel for ultrasonic wave propagation, ensuring that the ultrasonic waves emitted and / or received by the piezoelectric sensor 2 can penetrate without obstruction.

[0065] The dual-wave transducer 10 further includes a partition 12 disposed inside the housing 1, which separates the piezoelectric sensor 2 from the electromagnetic ultrasonic sensor 3.

[0066] The partition 12 divides the accommodating space enclosed by the outer shell 1 into two accommodating spaces, in which the piezoelectric sensor 2 and the electromagnetic ultrasonic sensor 3 are completely separated by the partition 12.

[0067] In an optional embodiment, the inner sidewall of the outer casing 1 is provided with a first step and a second step from top to bottom, wherein the first step is used to support the partition 12 and the second step is used to support the magnet fixing ring 33.

[0068] The dual-wave transducer 10 further includes a wire fixing clamp, and the housing 1 further includes a third opening 15, to which the wire fixing clamp is connected.

[0069] The wire fixing clamp is connected to the housing 1 through the third opening 15 to introduce the wire into the housing 1, providing a stable signal line and / or power line connection for the piezoelectric sensor 2 and electromagnetic ultrasonic sensor 3 inside the housing 1.

[0070] Specifically, the magnet retaining ring 33 has a notch from the upper surface to the lower surface to ensure that the signal line and / or power line passes through the magnet retaining ring 33 and is connected to the electromagnetic induction coil 32.

[0071] The accommodating space is cylindrical. The center of the first opening 13 and the center of the second opening 14 are located on the central axis of the outer shell 1 and are arranged opposite to each other. The piezoelectric sensor 2 and the electromagnetic ultrasonic sensor 3 are coaxially arranged with the central axis of the outer shell 1 as the axis.

[0072] Both the piezoelectric crystal 22 and the electromagnetic induction coil 32 adopt a ring or disk-shaped design to fit the inner wall of the housing 1 and form a tight connection with the inner wall of the cylindrical housing 1.

[0073] This application relates to a dual-wave transducer 10 for separate measurement, including a housing 1, a piezoelectric sensor 2, and an electromagnetic ultrasonic sensor 3. The housing 1 encloses a receiving space, which includes a first opening 13 and a second opening 14. The piezoelectric sensor 2 is disposed within the receiving space, and the first opening 13 exposes the detection surface of the piezoelectric sensor 2. The electromagnetic ultrasonic sensor 3 is disposed within the receiving space, and the second opening 14 exposes the detection surface of the electromagnetic ultrasonic sensor 3. By integrating the piezoelectric sensor 2 and the electromagnetic ultrasonic sensor 3 into the same housing 1, it is more convenient to separate the bolt specimen signals, thereby filtering out the transverse and longitudinal waves with the optimal signal-to-noise ratio, ensuring the measurability of the bolt axial force and the accuracy of the measured values.

[0074] In the description of this specification, references to terms such as "an embodiment," "some embodiments," "specifically," or "optional embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0075] This application has been described with reference to the above-mentioned embodiments; however, the above embodiments are merely examples for implementing this application. It must be noted that the disclosed embodiments do not limit the scope of this application. On the contrary, any modifications and refinements made without departing from the spirit and scope of this application are within the scope of patent protection of this application.

Claims

1. A dual-wavelength transducer, characterized in that, include: The housing (1) is configured to form an accommodating space, the accommodating space including a first opening (13) and a second opening (14); a piezoelectric sensor (2) is disposed in the accommodating space, the first opening (13) exposing the detection surface of the piezoelectric sensor (2); and an electromagnetic ultrasonic sensor (3) is disposed in the accommodating space, the second opening (14) exposing the detection surface of the electromagnetic ultrasonic sensor (3).

2. The dual-wavelength transducer according to claim 1, characterized in that, The piezoelectric sensor (2) includes a sound guide plate (21), a piezoelectric chip (22), and a signal processing circuit (23) arranged sequentially from the first opening (13) toward the second opening (14).

3. The dual-wavelength transducer according to claim 1, characterized in that, The electromagnetic ultrasonic sensor (3) includes a magnet (31) and an electromagnetic induction coil (32). The electromagnetic induction coil (32) is disposed at one end of the magnet (31) near the second opening (14), and the outer side of the electromagnetic induction coil (32) is adapted to the second opening (14).

4. The dual-wavelength transducer according to claim 3, characterized in that, The electromagnetic ultrasonic sensor (3) also includes a magnet (31) fixing ring, which is disposed between the outer side wall of the magnet (31) and the inner side wall of the housing (1) to fix the position of the magnet (31) in the accommodating space.

5. The dual-wavelength transducer according to claim 4, characterized in that, The electromagnetic ultrasonic sensor (3) also includes an absorbing plate (34), which is disposed between the magnet (31) and the electromagnetic induction coil (32).

6. The dual-wavelength transducer according to claim 1, characterized in that, The dual-wave transducer (10) further includes a cover (11) covering the first opening (13).

7. The dual-wavelength transducer according to claim 6, characterized in that, The cover (11) includes a hollow portion (111) located in the middle, the piezoelectric sensor (2) is fixed to the hollow portion (111), and the outer side of the piezoelectric sensor (2) is adapted to the hollow portion (111).

8. The dual-wavelength transducer according to claim 1, characterized in that, The dual-wave transducer (10) further includes a partition (12) disposed inside the housing (1), the partition (12) separating the piezoelectric sensor (2) from the electromagnetic ultrasonic sensor (3).

9. The dual-wavelength transducer according to claim 1, characterized in that, The dual-wave transducer (10) further includes a wire fixing clamp, and the housing (1) further includes a third opening (15), the wire fixing clamp being connected to the third opening (15).

10. The dual-wavelength transducer according to claim 1, characterized in that, The accommodating space is cylindrical, and the piezoelectric sensor (2) and the electromagnetic ultrasonic sensor (3) are coaxially arranged with the central axis of the outer shell (1) as the axis.

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