Event Title

The Radiating Near Field of an Ultrasonic Transducer Directly Coupled to an Isotropic Solid Half-Space

Location

Snowbird, UT, USA

Start Date

1-1-1999 12:00 AM

Description

Simulating the propagation of pulses radiated by ultrasonic transducers into an elastic half-space is a first step toward the system model of ultrasonic non-destructive evaluation (NDE) of industrial materials. The case of a time-harmonic transducer acting on the surface of a homogeneous and isotropic elastic half-space has been considered by Miller and Pursey [1]. The solutions were obtained in the integral form using the Hankel transform, and then the far-field asymptotics of the compressional and shear waves were found for the case of a point-like transducer. However, in practice large transducers are used and for the directly coupled large transducers mostly the near field is of interest. Its structure is rather complicated. For this reason, for the past two decades the problem has been intensively studied by various full numerical schemes (e.g. [2,3]). The schemes are time-consuming and do not produce explicit dependence of the radiated waves upon the model parameters. Therefore, a considerable effort has been put into developing analytical and approximate methods instead.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

18A

Chapter

Chapter 4: UT Transducers and Fields, Sensors

Section

UT Transducers Fields

Pages

1147-1154

DOI

10.1007/978-1-4615-4791-4_146

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

The Radiating Near Field of an Ultrasonic Transducer Directly Coupled to an Isotropic Solid Half-Space

Snowbird, UT, USA

Simulating the propagation of pulses radiated by ultrasonic transducers into an elastic half-space is a first step toward the system model of ultrasonic non-destructive evaluation (NDE) of industrial materials. The case of a time-harmonic transducer acting on the surface of a homogeneous and isotropic elastic half-space has been considered by Miller and Pursey [1]. The solutions were obtained in the integral form using the Hankel transform, and then the far-field asymptotics of the compressional and shear waves were found for the case of a point-like transducer. However, in practice large transducers are used and for the directly coupled large transducers mostly the near field is of interest. Its structure is rather complicated. For this reason, for the past two decades the problem has been intensively studied by various full numerical schemes (e.g. [2,3]). The schemes are time-consuming and do not produce explicit dependence of the radiated waves upon the model parameters. Therefore, a considerable effort has been put into developing analytical and approximate methods instead.