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Proceedings Paper

Development of pulse-echo ultrasonic propagation imaging system and its delivery to Korea Air Force
Author(s): Hasan Ahmed; Seung-Chan Hong; Jung-Ryul Lee; Jongwoon Park; Jeong-Beom Ihn
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Paper Abstract

This paper proposes a full-field pulse-echo ultrasonic propagation imaging (FF-PE-UPI) system for non-destructive evaluation of structural defects. The system works by detection of bulk waves that travel through the thickness of a specimen. This is achieved by joining the laser beams for the ultrasonic wave generation and sensing. This enables accurate and clear damage assessment and defect localization in the thickness with minimum signal processing since bulk waves are less susceptible to dispersion during short propagation through the thickness. The system consists of a Qswitched laser for generating the aforementioned waves, a laser Doppler vibrometer (LDV) for sensing, optical elements to combine the generating and sensing laser beams, a dual-axis automated translation stage for raster scanning of the specimen and a digitizer to record the signals. A graphical user interface (GUI) is developed to control all the individual blocks of the system. Additionally, the software also manages signal acquisition, processing, and display. The GUI is created in C++ using the QT framework. In view of the requirements posed by the Korean Air Force(KAF), the system is designed to be compact and portable to allow for in situ inspection of a selected area of a larger structure such as radome or rudder of an aircraft. The GUI is designed with a minimalistic approach to promote usability and adaptability while masking the intricacies of actual system operation. Through the use of multithreading the software is able to show the results while a specimen is still being scanned. This is achieved by real-time and concurrent acquisition, processing, and display of ultrasonic signal of the latest scan point in the scan area.

Paper Details

Date Published: 11 April 2017
PDF: 6 pages
Proc. SPIE 10164, Active and Passive Smart Structures and Integrated Systems 2017, 101640A (11 April 2017); doi: 10.1117/12.2263957
Show Author Affiliations
Hasan Ahmed, Korea Advanced Institute of Science and Technology (Korea, Republic of)
Seung-Chan Hong, Korea Advanced Institute of Science and Technology (Korea, Republic of)
Jung-Ryul Lee, Korea Advanced Institute of Science and Technology (Korea, Republic of)
Jongwoon Park, Republic of Korea Air Force (Korea, Republic of)
Jeong-Beom Ihn, Boeing Research & Technology (United States)

Published in SPIE Proceedings Vol. 10164:
Active and Passive Smart Structures and Integrated Systems 2017
Gyuhae Park, Editor(s)

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