Location

La Jolla, CA

Start Date

1-1-1987 12:00 AM

Description

One of the main goals of ultrasonic inspection is to determine the absolute scattering response from a given reflector (i.e., defect). In the literature there are a number of reported successful approaches for evaluation of the absolute scattering response from spheroidal inclusions and voids [1]. These approaches were based on a measurement model that accounts for transducer diffraction effects and the scattering and propagation through liquid-solid interfaces. Approximate analytic diffraction corrections were developed for some experimental configurations, and consequently the scattering responses were deconvolved from received ultrasonic signals in an absolute sense. However, one of the important conditions for the accuracy of the deconvolution process is the proper modeling of the individual transducer diffraction characteristic. There is evidence [2,3] based upon on-axis pressure studies and C-scan profiles that considerable discrepancies can occur between individual transducers of the same diameter and nominal frequency. The main purpose of this paper is to study the acoustic characteristics of a set of three unfocused, immersion, piezoelectric, pulse-echo transducers. The analysis of transducer modeling was performed by correlating the vibrating piston theory with experimental results.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

6A

Chapter

Chapter 3: Sensors and Probes

Section

Ultrasonics

Pages

657-666

DOI

10.1007/978-1-4613-1893-4_74

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Transducer Radiation Modeling for Ultrasonic Inspection Purposes

La Jolla, CA

One of the main goals of ultrasonic inspection is to determine the absolute scattering response from a given reflector (i.e., defect). In the literature there are a number of reported successful approaches for evaluation of the absolute scattering response from spheroidal inclusions and voids [1]. These approaches were based on a measurement model that accounts for transducer diffraction effects and the scattering and propagation through liquid-solid interfaces. Approximate analytic diffraction corrections were developed for some experimental configurations, and consequently the scattering responses were deconvolved from received ultrasonic signals in an absolute sense. However, one of the important conditions for the accuracy of the deconvolution process is the proper modeling of the individual transducer diffraction characteristic. There is evidence [2,3] based upon on-axis pressure studies and C-scan profiles that considerable discrepancies can occur between individual transducers of the same diameter and nominal frequency. The main purpose of this paper is to study the acoustic characteristics of a set of three unfocused, immersion, piezoelectric, pulse-echo transducers. The analysis of transducer modeling was performed by correlating the vibrating piston theory with experimental results.