Evaluating Image Precision of Acoustical Imaging Diffraction by Focused Ultrasound Beam

Sensors & Transducers Journal

(ISSN: 2306-8515, e-ISSN 1726-5479)

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Vol. 208, Issue 1, January 2017, pp. 51-58

Evaluating Image Precision of Acoustical Imaging Diffraction
by Focused Ultrasound Beam

^1a Jinwen DING, ² Dewen ZHENG, ³ Han DING, ⁴ Kang LI, ^1b Qichen MA, ^1c Guochao HE, ^1a Jingjing LIU and ^1a Junhua CHEN

^1a CAS Key Laboratory of Materials for Energy Conversion; Department of Materials Science and Engineering; ^1b School of the Gifted Young;
^1c School of Computer Science and Technology, University of Science and Technology of China, 96 Jinzhai Road, Hefei, 230026, China
² Research Institute of Petroleum Exploration and Development, Donghuan Road, Langfang, 065006, China
³ School of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, 6 Xuefu Middle Road, Xi’an, 710021, China
⁴ Anhui Academy of Coal Science, 81 Xuancheng Road, Hefei, 230001, China
E-mail: cjh@ustc.edu.cn, zdw69@petrochina.com.cn, jwding@ustc.edu.cn

Received: 30 December 2016 /Accepted: 24 January 2017 /Published: 31 January 2017

Abstract: The paper concisely reveals an acoustic behavior - acoustic diffraction (scattering) phenomena, which arises between a spherical cavity of acoustic lens and the microstructure of an object in immersion. As the result, this phenomena cause some negative influence on acoustical imaging precision. As a certain condition is satisfied, the outline of microstructure in acoustic images become blurred, the image precision is somewhat corroded. The paper introduces a brief evaluation approach to this acoustic interaction, and provides some typical characteristics of this acoustic interaction in two-dimensional (2D) and three-dimensional (3D) acoustical images. The paper suggests the researcher should take into account this interaction behavior - diffraction, to avoid any misrepresentation as investigating microstructures and imaging characterization, promoting the accuracy for materials characterization through the acoustical images by scanning acoustic microscopy technology (SAM), in the application field of non-destructive Testing / Evaluation (NDT/E).

Keywords: Transducer, Acoustic lens, Scattering and diffraction, Time-of-flight (TOF), Signal aberration, Acoustical imaging, Scanning acoustic microscopy, Non-destructive testing / evaluation (NDT/E).

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This work is licensed under a Creative Commons 4.0 International License

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