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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2009.12
- 수록면
- 550 - 556 (7page)
이용수
초록· 키워드
오류제보하기
In an application of a time reversal(TR) focusing of array transducer on a defect inside the test material, we employ a new time delay focusing technique based the TR process. In order to realize this idea, a multi-channel ultrasonic system is constructed capable of applying necessary time delays to each channel. The TR-based focusing procedure first measures the backscattered signals after firing one of the array elements. A phase slope method is then used to determine the time-of-flights of the backscattered signals received by all elements of the array. These time delays are used to adjust the time of excitation of the elements for transmission focusing on the defect. In addition to the TR focusing, the classical phased array focusing is also considered for comparison. Experimental results show that the TR-based time delay focusing produces much stronger backscattered signals than the phased array focusing, demonstrating the enhanced capability of the TR focusing.
목차
Abstract
1. Introduction
2. Time Delay Focusing Based on the TR Process
3. Experiments
4. Results and Discussion
5. Conclusion
References
참고문헌 (8)
참고문헌 신청
1. [학술지(정기간행물)] - Azar, L. / 2000 / Beam Focusing Behavior of Linear Phased Arrays / NDT&E International 33 : 189 ~ 198
2. [학술지(정기간행물)] - Bok Kyoung Choi / 2008 / Ultrasonic Focused Waveform Generation using Time Reversal Acoustic Focusing System / 대한기계학회 영문 논문집 22 (4) : 699 ~ 707
3. [학술지(정기간행물)] - Deutsch, W. A. K. / 1997 / Self-Focusing of Rayleigh and Lamb Waves with a Linear-Phased Array / Research in Nondestructive Evaluation 9 : 81 ~ 95
4. [학술지(정기간행물)] - Fink, M. / 1992 / Time Reversal of Ultrasonic Fields. I. Basic Principles / IEEE Trans. Ultrason. Ferroelectr. Freq. Control 39 : 555 ~ 566
5. [학술지(정기간행물)] - Jang, Y.-S. / 1999 / Measurements of Ultrasonic Velocity and Attenuation by Signal Processing Technique in Time and Frequency Domains / Journal of The Korean Society for Nondestructive Testing 19 : 118 ~ 128
2. [학술지(정기간행물)] - Bok Kyoung Choi / 2008 / Ultrasonic Focused Waveform Generation using Time Reversal Acoustic Focusing System / 대한기계학회 영문 논문집 22 (4) : 699 ~ 707
3. [학술지(정기간행물)] - Deutsch, W. A. K. / 1997 / Self-Focusing of Rayleigh and Lamb Waves with a Linear-Phased Array / Research in Nondestructive Evaluation 9 : 81 ~ 95
4. [학술지(정기간행물)] - Fink, M. / 1992 / Time Reversal of Ultrasonic Fields. I. Basic Principles / IEEE Trans. Ultrason. Ferroelectr. Freq. Control 39 : 555 ~ 566
5. [학술지(정기간행물)] - Jang, Y.-S. / 1999 / Measurements of Ultrasonic Velocity and Attenuation by Signal Processing Technique in Time and Frequency Domains / Journal of The Korean Society for Nondestructive Testing 19 : 118 ~ 128
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