@inproceedings{ab8cf3e197354d619065acba36264f58,
title = "Accurate measurement of closed cracks using subharmonic phased array",
abstract = "We developed a novel imaging method, subharmonic phased array for crack evaluation (SPACE), to measure closed-crack depth in the thickness direction. This implementation of the SPACE used a LiNbO3 single-crystal transmitter to generate the intense ultrasound required for subharmonic generation and a phased array sensor as a receiver for focusing on reception. We applied SPACE to closed fatigue and stress corrosion cracks and found that SPACE images can reduce the measurement error to approximately 1 mm. In addition, to explain the SPACE images, we propose a concept of localized subharmonic resonances.",
keywords = "Closed cracks, SPACE, Subharmonic resonance, Ultrasonic imaging",
author = "Yoshikazu Ohara and Setsu Yamamoto and Hiroaki Endo and Tsuyoshi Mihara and Kazushi Yamanaka",
year = "2008",
doi = "10.1063/1.2956284",
language = "English",
isbn = "9780735405448",
series = "AIP Conference Proceedings",
pages = "557--560",
booktitle = "Nonlinear Acoustics - Fundamentals and Applications - ISNA18 - 18th International Symposium on Nonlinear Acoustics",
note = "18th International Symposium on Nonlinear Acoustics, ISNA18 ; Conference date: 07-07-2008 Through 10-07-2008",
}