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research-article

Preliminary design of a high frequency phased-array acoustic microscope probe for nondestructive evaluation of pressure vessel and piping materials

[+] Author and Article Information
Jeong Nyeon Kim

Department of Engineering Science and Mechanics, The Pennsylvania State University, 212 Earth and Engineering Sciences Building, University Park, PA 16802, USA
juk252@psu.edu

Richard L. Tutwiler

Applied Research Laboratory, The Pennsylvania State University, P.O. Box 30, State College, PA 16804
rlt1@psu.edu

Judith Todd

Department of Engineering Science and Mechanics, The Pennsylvania State University, 212 Earth and Engineering Sciences Building, University Park, PA 16802, USA
jtodd@psu.edu

1Corresponding author.

ASME doi:10.1115/1.4040316 History: Received September 11, 2017; Revised May 11, 2018

Abstract

In pressure vessel and pipe inspection, ultrasonic nondestructive evaluation (NDE) plays a pivotal role in both in-situ and laboratory examinations. Scanning acoustic microscopy (SAM) has been a well-recognized laboratory tool for both visualization and quantitative evaluation of pressure vessel and piping materials at the microscale since its invention in 1974. While there have been multiple advances in SAM over the past four decades, some issues still remain to be addressed. First, the measurement speed is limited by the mechanical movement of the acoustic lens and the sample stage. Second, a single element transducer with an acoustic lens forms a predetermined beam pattern for a fixed focal length and incident angle, thereby limiting control of the inspection beam. Here, we propose to develop a phased-array probe as an alternative to overcome these issues. Preliminary studies to design a practical high frequency phased-array acoustic microscope probe were explored. A linear phased-array, comprising 32 elements and operating at 5 MHz, was modeled using PZFlex, a finite-element method software. This phased-array system was characterized in terms of electrical input impedance response, pulse-echo and impulse response, surface displacement profiles, mode shapes, and beam profiles. Details of the construction of the model and the results are presented in this paper. Development of a phased-array acoustic microscope probe will significantly enhance scanning acoustic microscopy techniques for detecting surface and subsurface defects and microstructural changes in laboratory samples of pressure vessel and piping materials.

Copyright (c) 2018 by ASME
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