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CN-121988519-A - Ultrasonic transducer shell wave suppression structure based on boundary state wave barrier, wave suppression method of ultrasonic transducer shell wave suppression structure and ultrasonic transducer

CN121988519ACN 121988519 ACN121988519 ACN 121988519ACN-121988519-A

Abstract

The invention provides an ultrasonic transducer shell wave-inhibiting structure based on a boundary state wave barrier, which comprises a transducer shell and a boundary state regulating structure arranged in a boundary region of the transducer shell, wherein the boundary state regulating structure inhibits the coupling output of multidirectional propagation waves, boundary reflection waves or trailing related waves to a detection direction by changing the propagation path, localized state or energy distribution of mechanical waves or ultrasonic stray waves propagated along the transducer shell. The invention has the advantages of remarkable wave suppression effect, convenience for integration with the existing transducer shell, strong engineering applicability and the like, and is suitable for nondestructive detection, structural health monitoring and other ultrasonic application scenes.

Inventors

  • HAN QIANGQIANG
  • WANG ZIJIAN

Assignees

  • 东南大学

Dates

Publication Date
20260508
Application Date
20260324

Claims (10)

  1. 1. The ultrasonic transducer shell wave-inhibiting structure based on the boundary state wave barrier is characterized by comprising a transducer shell and a boundary state regulating structure arranged in a boundary area of the transducer shell, wherein the boundary state regulating structure inhibits the coupling output of multidirectional propagation waves, boundary reflection waves or trailing related waves to a detection direction by changing the propagation path, localized state or energy distribution of mechanical waves or ultrasonic stray waves propagated along the transducer shell.
  2. 2. The ultrasonic transducer housing wave-inhibiting structure based on boundary state wave barriers of claim 1, wherein the boundary state regulating structure is arranged at least one of a housing peripheral boundary, a housing inner wall boundary, a corner region, and a connection region of the housing and other structures of the transducer housing.
  3. 3. The boundary state wave barrier-based ultrasonic transducer shell wave inhibiting structure according to claim 1, wherein the boundary state regulating structure is composed of one or any combination of a plurality of periodic units, quasi-periodic units, local defect units, groove structures, boss structures, local thinning areas and local thickening areas.
  4. 4. The boundary state wave barrier-based ultrasonic transducer housing wave-inhibiting structure of claim 1, wherein the characteristic dimensions of the boundary state tuning structure are determined by the target operating wavelength.
  5. 5. The boundary-state-wave barrier-based ultrasound transducer housing wave-inhibiting structure of claim 4, wherein the characteristic dimensions include a first characteristic dimension L 1 , a second characteristic dimension L 2 , and a third characteristic dimension L 3 , wherein L 3 is determined by a target operating wavelength λ and satisfies a predetermined geometric constraint relationship (L 3 – (L 1 + L 2 ). Ltoreq.λ/50).
  6. 6. The boundary state wave barrier-based ultrasonic transducer housing wave inhibiting structure of claim 1, wherein the transducer housing is made of metal, alloy or high stiffness composite material.
  7. 7. The ultrasonic transducer housing wave-inhibiting structure based on boundary state wave barriers of claim 1, wherein the boundary state regulating structure is formed on the transducer housing by additive manufacturing, integral printing, machining, precision cutting, etching forming or die forming.
  8. 8. A boundary state wave barrier-based ultrasonic transducer shell wave suppression method is characterized in that a boundary state regulation structure is built in a transducer shell boundary area, so that undesired waves propagating along the transducer shell are localized, deflected, blocked or attenuated in the transducer shell boundary area, the coupling of the undesired waves to a detection direction is reduced, and the unidirectionality and the fidelity of the output waveform of the transducer are improved.
  9. 9. The method for suppressing waves of an ultrasonic transducer housing based on boundary state wave barriers according to claim 8, wherein the boundary state adjusting and controlling structure enables the boundary local state to correspond to the target working frequency band of the transducer by controlling the geometric size, the arrangement mode or the local transition relation of the boundary region of the transducer housing.
  10. 10. An ultrasonic transducer is characterized by comprising a piezoelectric element and an ultrasonic transducer shell wave inhibiting structure as claimed in any one of claims 1 to 7, wherein the ultrasonic transducer shell wave inhibiting structure, the piezoelectric element and a backing layer are assembled together to form an integrated transducer shell assembly.

Description

Ultrasonic transducer shell wave suppression structure based on boundary state wave barrier, wave suppression method of ultrasonic transducer shell wave suppression structure and ultrasonic transducer Technical Field The invention belongs to the technical field of ultrasonic transducers, and particularly relates to a boundary state wave barrier-based ultrasonic transducer shell wave suppression structure, a boundary state wave barrier-based ultrasonic transducer shell wave suppression method and an ultrasonic transducer. Background Ultrasonic transducers are a core component in nondestructive testing, structural health monitoring, and industrial ultrasonic testing. The mechanical wave generated by the excitation of the piezoelectric element propagates along the expected direction, and reflection, diffraction and structure guided wave propagation can also occur in the transducer. Because acoustic impedance differences generally exist among the piezoelectric element, the backing layer and the transducer shell, part of waves can reflect from the shell after passing through the internal structure, and the other part of waves continue to propagate along the shell and are coupled to the tested object again, so that multidirectional clutter and tailing waves are formed, and the detection accuracy is affected. For the transducer housing, if the high attenuation material is directly used to suppress clutter, the excitation energy is often weakened and the detection depth is reduced, so that the dependence on the high attenuation material is not ideal. In contrast, the active regulation and control of the wave propagation path in the boundary region of the shell is more suitable for realizing clutter suppression while maintaining the structural compactness. Boundary states are localized wave field states supported by the boundary region itself, which are capable of characterizing how energy is constrained, guided, damped or blocked along the boundary and are therefore suitable for wave propagation interception in dynamic processes. The prior art for transducer housings has focused on improving signal output, enhancing shock resistance, or improving operational stability, while there is insufficient focus on multidirectional clutter suppression propagating along the housing. Therefore, it is necessary to provide a wave-suppressing structure that can directly act on the boundary propagation behavior of the transducer housing, so that the wave-suppressing structure can locally regulate, deflect, block or attenuate the undesired wave propagating along the housing without significantly weakening the main excitation energy, thereby improving the quality of the output waveform of the transducer. Disclosure of Invention The invention aims to provide a boundary state wave barrier-based ultrasonic transducer shell wave suppression structure, a boundary state wave barrier-based ultrasonic transducer shell wave suppression method and an ultrasonic transducer, so as to solve the problems that multi-directional transmission clutter in the existing transducer shell is difficult to effectively suppress, trailing waves are longer and output waveforms are insufficient in fidelity. The method aims at changing the propagation path, the localization state and the energy distribution of mechanical waves or ultrasonic stray waves propagated along a shell by arranging a boundary state regulation structure in the shell or the boundary region of the shell of the transducer, so that the coupling of unexpected propagation components to a detection direction is inhibited, and the unidirectionality and the signal fidelity of the output ultrasonic of the transducer are improved. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: The boundary state regulating structure suppresses coupling output of multidirectional propagation waves, boundary reflection waves or trailing related waves to a detection direction by changing propagation paths, localized states or energy distribution of mechanical waves or ultrasonic stray waves propagated along the transducer shell. Further, the boundary state regulating structure is arranged at least one of the peripheral boundary of the shell, the boundary of the inner wall of the shell, the corner area and the connection area of the shell and other structures of the transducer shell. Further, the boundary state regulation structure is formed by one or any combination of a plurality of periodic units, quasi-periodic units, local defect units, groove structures, boss structures, local thinning areas and local thickening areas. Further, the characteristic size of the boundary state adjusting and controlling structure is determined through the target working wavelength. Further, the feature sizes include a first feature size L 1 , a second feature size L 2 and a third feature size L 3, wherein L 3 is determined by a target operating wavelength lambda and satisfies a prese