Enhancement of the selectivity of closed cracks in nonlinear ultrasonic imaging using amplitude difference phased array

Yoshikazu Ohara; Masako Ikeuchi; Kentaro Jinno; Akihiro Ouchi; Satoshi Horinouchi; Kazushi Yamanaka

Enhancement of the selectivity of closed cracks in nonlinear ultrasonic imaging using amplitude difference phased array

Yoshikazu Ohara, Masako Ikeuchi, Kentaro Jinno, Akihiro Ouchi, Satoshi Horinouchi, Kazushi Yamanaka

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

Subharmonic waves realize a high selectivity for closed cracks. However, when a short-burst wave is used to achieve a high temporal resolution, not only closed cracks but also linear scatterers appear in the subharmonic image owing to leakage in frequency filtering. They are ghosts that degrade the selectivity for closed crack in the subharmonic image. Here, we propose an amplitude difference phased array (ADPA), where the ghosts are eliminated by subtracting a subharmonic image at a small input multiplied by the input amplitude ratio from that at a large input. We verified the ADPA method by a two-dimensional simulation based on the finite difference time domain (FDTD) method with damped double nodes (DDNs) for subharmonic imaging of closed cracks. Furthermore, the ADPA method was experimentally verified in a closed-crack specimen.

Original language	English
Title of host publication	2012 Proceedings of SICE Annual Conference, SICE 2012
Publisher	Society of Instrument and Control Engineers (SICE)
Pages	1177-1180
Number of pages	4
ISBN (Print)	9781467322591
Publication status	Published - 2012 Jan 1
Event	2012 51st Annual Conference on of the Society of Instrument and Control Engineers of Japan, SICE 2012 - Akita, Japan Duration: 2012 Aug 20 → 2012 Aug 23

Publication series

Name	Proceedings of the SICE Annual Conference

Other

Other	2012 51st Annual Conference on of the Society of Instrument and Control Engineers of Japan, SICE 2012
Country	Japan
City	Akita
Period	12/8/20 → 12/8/23

Keywords

Amplitude difference phased array (ADPA)
closed cracks
damped double node (DDN)
nonlinear ultrasonic imaging

ASJC Scopus subject areas

Control and Systems Engineering
Computer Science Applications
Electrical and Electronic Engineering

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Ohara, Y., Ikeuchi, M., Jinno, K., Ouchi, A., Horinouchi, S., & Yamanaka, K. (2012). Enhancement of the selectivity of closed cracks in nonlinear ultrasonic imaging using amplitude difference phased array. In 2012 Proceedings of SICE Annual Conference, SICE 2012 (pp. 1177-1180). [6318622] (Proceedings of the SICE Annual Conference). Society of Instrument and Control Engineers (SICE).

Enhancement of the selectivity of closed cracks in nonlinear ultrasonic imaging using amplitude difference phased array. / Ohara, Yoshikazu; Ikeuchi, Masako; Jinno, Kentaro; Ouchi, Akihiro; Horinouchi, Satoshi; Yamanaka, Kazushi.

2012 Proceedings of SICE Annual Conference, SICE 2012. Society of Instrument and Control Engineers (SICE), 2012. p. 1177-1180 6318622 (Proceedings of the SICE Annual Conference).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Ohara, Y, Ikeuchi, M, Jinno, K, Ouchi, A, Horinouchi, S & Yamanaka, K 2012, Enhancement of the selectivity of closed cracks in nonlinear ultrasonic imaging using amplitude difference phased array. in 2012 Proceedings of SICE Annual Conference, SICE 2012., 6318622, Proceedings of the SICE Annual Conference, Society of Instrument and Control Engineers (SICE), pp. 1177-1180, 2012 51st Annual Conference on of the Society of Instrument and Control Engineers of Japan, SICE 2012, Akita, Japan, 12/8/20.

Ohara, Yoshikazu ; Ikeuchi, Masako ; Jinno, Kentaro ; Ouchi, Akihiro ; Horinouchi, Satoshi ; Yamanaka, Kazushi. / Enhancement of the selectivity of closed cracks in nonlinear ultrasonic imaging using amplitude difference phased array. 2012 Proceedings of SICE Annual Conference, SICE 2012. Society of Instrument and Control Engineers (SICE), 2012. pp. 1177-1180 (Proceedings of the SICE Annual Conference).

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abstract = "Subharmonic waves realize a high selectivity for closed cracks. However, when a short-burst wave is used to achieve a high temporal resolution, not only closed cracks but also linear scatterers appear in the subharmonic image owing to leakage in frequency filtering. They are ghosts that degrade the selectivity for closed crack in the subharmonic image. Here, we propose an amplitude difference phased array (ADPA), where the ghosts are eliminated by subtracting a subharmonic image at a small input multiplied by the input amplitude ratio from that at a large input. We verified the ADPA method by a two-dimensional simulation based on the finite difference time domain (FDTD) method with damped double nodes (DDNs) for subharmonic imaging of closed cracks. Furthermore, the ADPA method was experimentally verified in a closed-crack specimen.",

keywords = "Amplitude difference phased array (ADPA), closed cracks, damped double node (DDN), nonlinear ultrasonic imaging",

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AB - Subharmonic waves realize a high selectivity for closed cracks. However, when a short-burst wave is used to achieve a high temporal resolution, not only closed cracks but also linear scatterers appear in the subharmonic image owing to leakage in frequency filtering. They are ghosts that degrade the selectivity for closed crack in the subharmonic image. Here, we propose an amplitude difference phased array (ADPA), where the ghosts are eliminated by subtracting a subharmonic image at a small input multiplied by the input amplitude ratio from that at a large input. We verified the ADPA method by a two-dimensional simulation based on the finite difference time domain (FDTD) method with damped double nodes (DDNs) for subharmonic imaging of closed cracks. Furthermore, the ADPA method was experimentally verified in a closed-crack specimen.

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