Hydrophone for detecting self-focusing transducer and sound intensity test system

Abstract

The utility model discloses a hydrophone for detecting a self-focusing transducer and a sound intensity test system, and relates to the technical field of sound field test hydrophones, the hydrophone comprises an acoustic wave guide rod, a hydrophone body and an acoustic board, a mounting cavity in the middle of the hydrophone body enables the acoustic wave guide rod to be suspended through a fixing assembly, and the acoustic board is arranged in the mounting cavity. The sound absorption plate is arranged on the upper end face of the hydrophone body, a through hole of the sound absorption plate is aligned with the receiving end of the guide rod, focused sound waves can pass through the sound absorption plate, reflected waves and stray sound waves can be absorbed, the signal purity is improved, and meanwhile the sound intensity testing system comprises the hydrophone, a water tank, an installation base and a tester. According to the invention, the position of the focal core can be dynamically positioned, the focal region range is accurately defined, and the detection precision is greatly improved by optimizing the medium, enhancing the structural vibration resistance and reducing the signal noise.

Description

Technical Field

[0001] This utility model relates to the field of hydrophone technology for sound field testing, specifically to a hydrophone and sound intensity testing system for testing self-focusing transducers. Background Technology

[0002] In ultrasound therapy for tumors, the size and shape of the ultrasound focal nucleus generated by a self-focusing ultrasound transducer are key factors determining the treatment outcome. Precise control of the focal nucleus allows energy to be directed precisely at the tumor tissue, minimizing damage to surrounding healthy tissues, thereby improving treatment effectiveness and patient prognosis.

[0003] Currently, the size and shape of the ultrasound focal nucleus are mainly determined using hydrophones. However, existing hydrophones have several structural and testing methodological problems. Structurally, the materials used, internal structure, and connections between components can interfere with the reception and transmission of sound signals, leading to signal deviations and an inability to accurately reflect the focal nucleus. In terms of testing methods, existing procedures and data analysis techniques are not scientific enough, making the testing process susceptible to external factors, significantly reducing the accuracy and reliability of the data, and ultimately resulting in testing precision that cannot meet the growing demands of treatment.

[0004] To improve the accuracy of ultrasound focal nucleus detection and meet the high precision requirements of clinical ultrasound therapy, it is necessary to design a high-precision hydrophone and sound intensity testing system specifically adapted to self-focusing ultrasound transducers. Utility Model Content

[0005] The purpose of this invention is to provide a hydrophone and sound intensity testing system for testing self-focusing transducers. The sound waveguide rod is suspended in the air by multiple sets of fixing components installed in the cavity in the middle of the main body, thereby decoupling mechanical vibration from sound wave transmission. The sound-absorbing plate at the top is aligned with the receiving end of the guide rod through a through hole. While allowing the focused sound wave to reach directly, the sound-absorbing plate absorbs reflected waves and stray sound waves, significantly improving signal purity and solving the problems of severe signal interference and insufficient detection accuracy in traditional hydrophones.

[0006] This utility model is achieved through the following technical solution:

[0007] A hydrophone for detecting a self-focusing transducer, comprising:

[0008] Acoustic waveguide;

[0009] The hydrophone body has a mounting cavity in the middle to accommodate the acoustic waveguide rod, and a fixing component is provided between the mounting cavity and the acoustic waveguide rod so that the acoustic waveguide rod is suspended in the mounting cavity.

[0010] A sound-absorbing plate is connected to the upper surface of the hydrophone body. The sound-absorbing plate has a through hole that matches the mounting cavity, and the receiving end of the acoustic waveguide extends outward from the through hole.

[0011] In this design, the acoustic waveguide rod is suspended in the center of the mounting cavity in the middle of the hydrophone body through a fixing component. This non-rigid connection method ensures that the acoustic waveguide rod can vibrate freely when receiving ultrasonic waves to improve signal acquisition sensitivity, while reducing the interference of the hydrophone body's structural vibration on sound wave transmission through physical isolation. The sound-absorbing plate at the top is aligned with the receiving end of the acoustic waveguide rod through a through hole. While allowing the focused ultrasonic energy to be concentrated and transmitted to the guide rod, it can effectively absorb the reflected waves and stray sound waves generated when the sound waves propagate in the medium, significantly improving the purity of the sound signal. This dual effect of mechanical decoupling and acoustic optimization ensures that the acoustic waveguide rod efficiently receives focused sound energy while minimizing the influence of environmental noise and structural vibration, enabling the hydrophone to maintain high sensitivity and low noise characteristics even in complex testing environments.

[0012] As a further embodiment of the hydrophone, the top of the acoustic waveguide rod is 0.5mm to 10mm higher than the inner plane of the sound-absorbing plate.

[0013] In this design, the top of the guide rod protrudes beyond the plane of the sound-absorbing plate, allowing its receiving end to be directly exposed to the detection medium. This effectively avoids the attenuation effect of the sound-absorbing plate material on the focused sound waves, ensuring that ultrasonic energy is transmitted to the guide rod with minimal loss. Simultaneously, the local sound field structure formed by this height difference suppresses the interference of reflected waves from the sound-absorbing plate surface on the receiving end of the guide rod, reducing the superposition effect of stray sound waves through physical spatial isolation.

[0014] As a further embodiment of the hydrophone, the hydrophone body also includes a pointed cone, a base, and a positioning cover;

[0015] The positioning cover has a positioning cavity that matches the pointed cone. The lower end of the positioning cavity is threaded to the base so that the pointed cone and the base are connected as one unit. A sealing element is also connected between the pointed cone and the base.

[0016] In this design, the positioning cavity inside the positioning cover matches the outer contour of the pointed cone, providing stable support and positioning for the cone, and enabling quick assembly and easy disassembly maintenance of the entire hydrophone body through the threaded connection between the lower end and the base. The pointed cone serves as the supporting foundation for the waveguide rod, with its top surface fixedly connected to the sound-absorbing plate, ensuring that the waveguide rod axis is perpendicularly aligned with the incident sound wave direction, thereby improving sound field reception efficiency. The threaded connection between the base and the positioning cover allows for fine-tuning of the pointed cone's axial position during installation to accommodate different focal length detection requirements, while the preload generated by the threaded engagement effectively suppresses relative vibration between components.

[0017] As a further embodiment of the hydrophone, the fixing assembly includes an upper fixing assembly for radial fixing of the acoustic waveguide rod and a lower fixing assembly for axial fixing of the acoustic waveguide rod.

[0018] The upper fixing assembly includes multiple elastic upper fixing members, and the outer wall of the acoustic waveguide rod is provided with an annular curved groove that matches the upper fixing member. The upper fixing member is in elastic contact with the inner wall of the mounting cavity.

[0019] In this design, the upper fixing assembly employs multiple elastic upper fixing components that engage with the annular curved groove on the outer wall of the acoustic waveguide rod. This achieves radial positioning while allowing the guide rod to vibrate freely under acoustic excitation. The curved groove structure evenly distributes contact stress along the circumference of the guide rod, avoiding vibration mode distortion caused by localized rigid constraints. The flexible contact between the elastic fixing components and the inner wall of the mounting cavity forms a dynamic buffer, suppressing radial displacement of the guide rod and reducing the transmission of vibration from the hydrophone body structure to the guide rod. The lower fixing assembly, through the combination of an axial limiting structure and an elastic seal, ensures the axial stability of the guide rod while preventing the influence of axial force on the vibration degree of freedom.

[0020] As a further embodiment of the hydrophone, the lower fixing assembly includes a resilient lower fixing member and a locking block. The outer wall of the acoustic waveguide is provided with a shoulder that matches the lower fixing member. The locking block is threadedly connected to the mounting cavity and presses against the lower fixing member.

[0021] In this design, the lower fixing component is nested within the shoulder structure of the acoustic waveguide rod. This provides initial axial support through an interference fit and allows the waveguide rod to undergo slight axial displacement under acoustic excitation through its own elastic deformation, thereby avoiding the influence of rigid constraints on the vibration modes. The locking block, through its threaded connection with the mounting cavity, can adjust the compression of the lower fixing component, thus dynamically controlling the magnitude of the axial preload. While ensuring the axial position stability of the waveguide rod, the elastic deformation absorbs the vibration energy of the waveguide rod, reducing the mechanical vibration transmitted to the hydrophone body. Furthermore, the contact surface between the shoulder and the lower fixing component adopts a curved transition design, which can transform concentrated stress into uniformly distributed elastic stress, effectively preventing positioning failure caused by local plastic deformation.

[0022] As a further embodiment of the hydrophone, the locking block is provided with a through hole, and the lower end of the acoustic waveguide rod passes through the through hole and connects to the piezoelectric device.

[0023] In this design, the through-hole acts as a bridge for sound wave transmission. The ultrasonic waves received by the waveguide rod can be smoothly transmitted to the piezoelectric device, which converts the received acoustic signal into an electrical signal, facilitating analysis and processing by the subsequent detection system. This connection method ensures the efficiency and accuracy of the sound wave transmission process, reduces signal loss and interference during transmission, and improves the accuracy and reliability of sound signal conversion and detection when using hydrophones to detect self-focusing transducers.

[0024] As a further embodiment of the hydrophone, the hydrophone body also includes a wire fastening head, which is fixed in the mounting cavity, and the signal line connected to the piezoelectric device is laid outward through the wire fastening head.

[0025] In this design, the wire fastening head serves as a rigid fixing node, anchoring the signal line connected to the piezoelectric device inside the mounting cavity. This prevents the signal line from shifting due to water flow impact or mechanical vibration during hydrophone operation and reduces noise interference during signal transmission through physical constraints.

[0026] As a further embodiment of the hydrophone, the hydrophone body also includes a wire-passing seal, an outlet hole is provided on the side of the base, the wire-passing seal is connected in the outlet hole, and the signal line passes through the wire-passing seal to connect to an external device.

[0027] In this solution, the wire-passing seal forms a multi-level sealing barrier along the critical path of the signal line through the hydrophone body. Combined with the physical limiting function of the wire-passing fastener, it completely blocks the potential path of the detection medium to penetrate along the signal line, ensuring that the hydrophone can maintain reliable electrical performance even in long-term immersion environments.

[0028] As a further embodiment of the hydrophone, the base is provided with a bottom cover, and a sealing element is provided between the base and the bottom cover.

[0029] In this design, the bottom cover, as a detachable enclosed element, forms a complete cavity structure through a rigid connection with the base, effectively isolating the detection medium from the precision components inside the hydrophone and preventing electrical short circuits or material corrosion caused by liquid intrusion.

[0030] A sound intensity testing system for detecting self-focusing transducers includes a hydrophone, a water tank, a mounting base, and a testing instrument.

[0031] The mounting base and the hydrophone are respectively connected to the water tank filled with the detection medium. The lower end of the mounting base is connected to a self-focusing ultrasonic transducer. The self-focusing ultrasonic transducer continuously emits ultrasonic waves to the hydrophone by changing its position. The hydrophone converts the received ultrasonic signals into electrical signals and transmits them to the test instrument via a signal line.

[0032] In this solution, the mounting base can move the self-focusing ultrasound transducer in a water tank filled with the detection medium, causing the focused ultrasound energy emitted by it to form a dynamic focal core region in the medium. The hydrophone can efficiently receive ultrasound signals from different locations and convert them into electrical signals through a piezoelectric device. The tester collects, displays, and analyzes sound intensity waveform data in real time through signal lines, and constructs a three-dimensional sound field distribution map by combining the transducer's movement trajectory. This system not only achieves dynamic positioning of the focal core and precise definition of the focal range, but also improves the detection accuracy to the sub-millimeter level through medium optimization, structural vibration resistance, and signal noise reduction. This provides a reliable quantitative basis for the clinical calibration of self-focusing ultrasound therapy equipment, ensuring that it achieves precise energy focusing in tumor treatment and minimizing damage to healthy tissues.

[0033] In summary, compared with the prior art, this utility model has the following advantages and beneficial effects:

[0034] 1. The top sound-absorbing plate of this utility model is aligned with the receiving end of the sound wave guide rod through a matching through hole. While allowing the focused ultrasonic energy to be concentrated and transmitted to the guide rod, it can effectively absorb the reflected waves and stray sound waves generated when the sound wave propagates in the medium, and significantly improve the purity of the sound signal.

[0035] 2. The sound intensity testing system of this utility model integrates a hydrophone, a water tank, a mounting base, and a testing instrument, which can dynamically locate the focal core position formed by the ultrasonic waves emitted by the self-focusing transducer and accurately define the focal range. Attached Figure Description

[0036] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0037] Figure 1 This is a schematic diagram of the sound intensity testing system.

[0038] Figure 2 This is a front view schematic diagram of the hydrophone's structure.

[0039] Figure 3 This is a cross-sectional structural diagram of a hydrophone.

[0040] Figure 4 This is a diagram showing the shape of the focal core formed by a self-focusing ultrasonic transducer.

[0041] The attached diagram shows the markings and corresponding component names:

[0042] 1-Water tank, 2-Detection medium;

[0043] 3-Hydrophone, 301-Sound-absorbing plate, 302-Cone, 303-Sound waveguide rod, 304-Locking block, 305-Positioning cover, 306-Piezoelectric device, 307-Base, 308-Bottom cover, 309-Upper fixing part, 310-Lower fixing part, 311-Sealing part, 312-Wire fastening head, 313-Wire sealing part;

[0044] 4-Mounting base, 5-Tester, 6-High frequency power source device, 7-Signal line, 8-Power line. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0046] Example 1

[0047] This embodiment 1 provides a hydrophone for detecting self-focusing transducers, such as... Figures 2-3 As shown, it includes a waveguide rod 303, a hydrophone body, and a sound-absorbing plate 301.

[0048] Please refer to Figure 3 As shown, the hydrophone body has a mounting cavity in the middle to accommodate the acoustic waveguide rod 303, and a fixing component is provided between the mounting cavity and the acoustic waveguide rod 303, so that the acoustic waveguide rod 303 is suspended in the mounting cavity. This ensures that the acoustic waveguide rod 303 can vibrate freely when receiving ultrasonic waves to improve signal acquisition sensitivity, and reduces the interference of the hydrophone body structure vibration on the sound wave transmission through physical isolation.

[0049] Specifically, the hydrophone body includes a cone 302, a base 307, and a positioning cover 305. A positioning cavity matching the outer contour of the cone 302 is provided inside the positioning cover 305. The cone 302 has a limiting shoulder for limiting the positioning cavity. The lower end of the positioning cavity is threaded to the base 307, so that the cone 302 and the base 307 are connected together as a whole. A sealing element 311 is also connected between the cone 302 and the base 307. The sealing element 311 can be an O-ring or a gasket, etc. At the same time, the middle part of the cone 302 and the base 307 forms the mounting cavity for accommodating the acoustic waveguide rod 303. The mounting cavity is a through cavity. Therefore, a bottom cover 308 is connected to the bottom of the mounting cavity, that is, a bottom cover 308 is connected to the bottom of the base 307. To ensure the sealing of the mounting cavity, a sealing element 311 is also connected between the base 307 and the bottom cover 308.

[0050] To ensure the acoustic waveguide 303 is suspended within the mounting cavity while maintaining a tight seal, such as... Figure 3As shown, the above-mentioned fixing assembly includes an upper fixing assembly for radial fixing of the acoustic waveguide rod 303 and a lower fixing assembly for axial fixing of the acoustic waveguide rod 303.

[0051] The upper fixing assembly includes two or more elastic upper fixing members 309, such as O-rings. The upper fixing members 309 are spaced apart along the axial direction of the acoustic waveguide rod 303. The outer wall of the acoustic waveguide rod 303 is provided with an annular curved groove that matches the upper fixing member 309. The other side of the upper fixing member 309 elastically contacts the inner wall of the mounting cavity to form a dynamic buffer. In this way, the radial displacement of the acoustic waveguide rod 303 is suppressed, and the transmission of vibration of the hydrophone body structure to the acoustic waveguide rod 303 is reduced.

[0052] The lower fixing component is located below the upper fixing member 309 and includes an elastic lower fixing member 310 and a locking block 304. For example, the lower fixing member 310 is also an O-ring. The outer wall of the acoustic waveguide rod 303 is provided with a shoulder that matches the lower fixing member 310. The locking block 304 is threadedly connected to the mounting cavity and presses the lower fixing member 310. Through the combination of the axial limiting structure and the lower fixing member 310, the axial stability of the acoustic waveguide rod 303 is ensured while playing a sealing role.

[0053] More specifically, a through hole is provided on the locking block 304, and the lower end of the acoustic waveguide rod 303 passes through the through hole and connects to the piezoelectric device 306. At the same time, a wire fastening head 312 is fixed in the mounting cavity. The signal line 7 connected to the piezoelectric device 306 passes through the wire fastening head 312 and is laid to the wire sealing member 313 on the side of the base 307. The wire sealing member 313 is sealed to the outlet hole provided on the side of the base 307. In this way, a multi-level sealing barrier is formed on the path of the signal line 7 through the hydrophone body, completely blocking the potential path of the detection medium to penetrate along the signal line 7.

[0054] Example 2

[0055] To improve the purity of the acoustic signal, this embodiment 2 provides a hydrophone for detecting self-focusing transducers, based on embodiment 1. Figures 2-3As shown, a sound-absorbing plate 301 is connected to the upper end face of the hydrophone body. The sound-absorbing plate 301 is made of various damping materials, composite materials, organic fiber materials, micro-perforated materials, aluminum foam, etc. The sound-absorbing plate 301 has a through hole in the middle for matching the mounting cavity. The receiving end of the acoustic waveguide 303 extends outward from the through hole. Specifically, the top of the cone 302 is flat and fixed together with the sound-absorbing plate 301. Since the acoustic waveguide 303 needs to be made of materials with good acoustic performance, mechanical performance and corrosion resistance, materials such as copper, stainless steel, titanium alloy, polyurethane, modified rubber, and polymers can generally be used. Different materials result in different surface areas for receiving signals, and the height of the acoustic waveguide 303 extending outward from the through hole is also different. Preferably, the top of the acoustic waveguide 303 is 0.5mm to 10mm higher than the inner plane of the sound-absorbing plate 301, which effectively avoids the attenuation effect of the sound-absorbing plate material on the focused sound wave and ensures that the ultrasonic energy is transmitted to the acoustic waveguide 303 with minimal loss.

[0056] Example 3

[0057] This embodiment 3 provides a sound intensity testing system for detecting self-focusing transducers, such as... Figure 1 As shown, the device includes the hydrophone 3, water tank 1, mounting base 4, and testing instrument 5 described in Embodiment 1 or Embodiment 2. The mounting base 4 and hydrophone 3 are respectively connected to the water tank 1 filled with the detection medium 2, wherein the detection medium 2 is deoxygenated and vacuumed water. The lower end of the mounting base 4 is connected to a self-focusing ultrasonic transducer. The self-focusing ultrasonic transducer continuously emits ultrasonic waves to the hydrophone 3 by changing its position. The hydrophone 3 converts the received ultrasonic wave signal into an electrical signal and transmits it to the testing instrument 5 via the signal line 7.

[0058] Specifically, the high-frequency power source device 6 applies an electric field to the self-focusing ultrasonic transducer through the power line 8, and transmits the electrical signal to the high-frequency power source device 6 through the signal line 7. After being processed by the high-frequency power source device 6, the electrical signal is transmitted to the test instrument 5, where the changes in sound intensity and sound pressure waveforms emitted by the self-focusing ultrasonic transducer can be observed.

[0059] A self-focusing ultrasonic transducer converts electrical energy into ultrasonic energy under the influence of an electric field. The transducer is arc-shaped, allowing the ultrasonic waves to pass through the detection medium 2 and converge at a single point, forming a focal core. The shape of the focal core is shown in [details omitted]. Figure 4The hydrophone 3 is located below the self-focusing ultrasonic transducer. By moving the position of the mounting base 4, the focal core moves, allowing the acoustic waveguide 303 at the upper end of the hydrophone 3 to receive ultrasonic waves. The ultrasonic waves are transmitted to the piezoelectric device 306 through the acoustic waveguide 303. The piezoelectric device 306 converts the acoustic signal into an electrical signal, which is transmitted to the testing instrument 5 via the signal line 7. By adjusting the position of the transducer, the change in the sound intensity waveform on the testing instrument 5 can be observed, and the point with the most significant waveform can be found. This point usually represents the focal point. The sound-absorbing plate 301 is used to absorb the ultrasonic waves in the area between the focal point and the focal core. Subsequently, the transducer is moved further to gradually determine the edge of the sound intensity focal region. By analyzing the changes in the sound intensity waveform, the range of the focal region can be accurately defined.

[0060] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A hydrophone for detecting self-focusing transducers, characterized in that, include: Acoustic waveguide (303); The hydrophone body has a mounting cavity in the middle to accommodate the acoustic waveguide rod (303), and a fixing component is provided between the mounting cavity and the acoustic waveguide rod (303) so that the acoustic waveguide rod (303) is suspended in the mounting cavity; A sound-absorbing plate (301) is connected to the upper end face of the hydrophone body. The sound-absorbing plate (301) has a through hole that matches the mounting cavity. The receiving end of the acoustic waveguide rod (303) extends outward from the through hole.

2. A hydrophone for detecting a self-focusing transducer according to claim 1, characterized in that, The top of the acoustic waveguide rod (303) is 0.5mm to 10mm higher than the inner plane of the sound-absorbing plate (301).

3. A hydrophone for detecting a self-focusing transducer according to claim 1, characterized in that, The hydrophone body also includes a cone (302), a base (307), and a positioning cover (305); The positioning cover (305) has a positioning cavity inside that matches the cone (302). The lower end of the positioning cavity is threadedly connected to the base (307) so that the cone (302) and the base (307) are connected as one unit. A sealing element (311) is also connected between the cone (302) and the base (307).

4. A hydrophone for detecting a self-focusing transducer according to claim 3, characterized in that, The fixing assembly includes an upper fixing assembly for radial fixing of the acoustic waveguide rod (303) and a lower fixing assembly for axial fixing of the acoustic waveguide rod (303); The upper fixing component includes multiple elastic upper fixing members (309), and the outer wall of the acoustic waveguide rod (303) is provided with an annular curved groove that matches the upper fixing member (309). The upper fixing member (309) is in elastic contact with the inner wall of the mounting cavity.

5. A hydrophone for detecting a self-focusing transducer according to claim 4, characterized in that, The lower fixing assembly includes a flexible lower fixing member (310) and a locking block (304). The outer wall of the acoustic waveguide rod (303) is provided with a shoulder that matches the lower fixing member (310). The locking block (304) is threadedly connected to the mounting cavity and presses against the lower fixing member (310).

6. A hydrophone for detecting a self-focusing transducer according to claim 5, characterized in that, The locking block (304) is provided with a through hole, and the lower end of the acoustic waveguide rod (303) passes through the through hole and is connected to the piezoelectric device (306).

7. A hydrophone for detecting a self-focusing transducer according to claim 6, characterized in that, The hydrophone body also includes a wire fastening head (312), which is fixed in the mounting cavity, and the signal line (7) connected to the piezoelectric device (306) is laid outward through the wire fastening head (312).

8. A hydrophone for detecting a self-focusing transducer according to claim 7, characterized in that, The hydrophone body also includes a wire seal (313), and an outlet hole is provided on the side of the base (307). The wire seal (313) is connected inside the outlet hole, and the signal line (7) passes through the wire seal (313) to connect to an external device.

9. A hydrophone for detecting a self-focusing transducer according to claim 3, characterized in that, The bottom of the base (307) is provided with a bottom cover (308), and a sealing element (311) is provided between the base (307) and the bottom cover (308).

10. A sound intensity testing system for detecting a self-focusing transducer, characterized in that, Includes the hydrophone (3), water tank (1), mounting base (4), and testing instrument (5) as described in any one of claims 1-9; The mounting base (4) and the hydrophone (3) are respectively connected to the water tank (1) filled with the detection medium (2). The lower end of the mounting base (4) is connected to a self-focusing ultrasonic transducer. The self-focusing ultrasonic transducer continuously emits ultrasonic waves to the hydrophone (3) by changing its position. The hydrophone (3) converts the received ultrasonic wave signal into an electrical signal and transmits it to the tester (5) via a signal line (7).

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