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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2010.12
- 수록면
- 569 - 577 (9page)
이용수
초록· 키워드
오류제보하기
Nonplanar surface geometries of components are frequently encountered in real ultrasonic inspection situations. Use of rigid array transducers can lead to beam defocusing and reduction of defect image quality due to the mismatch between the planar array and the changing surface. When a flexible array is used to fit the complex surface profile, the locations of array elements should be known to compute the delay time necessary for adaptive beam focusing. An alternative method is to employ the time reversal focusing technique that does not require a prior knowledge about the properties and structures of the specimen and the transducer. In this paper, a time reversal method is applied to simulate beam focusing of flexible arrays and imaging of point-like defects contained in specimens with nonplanar surface geometry. Quantitative comparisons are made for the performance of a number of array techniques in terms of the ability to focus and image three point-like reflectors positioned at regular intervals. The sinusoidal profile array studied here exhibits almost the same image quality as the flat, reference case.
목차
Abstract
1. Introduction
2. Description of Array Transducer Wave Fields
3. Beamforming for Defect Imaging
4. Simulation Results and Discussion
5. Conclusion
References
참고문헌 (16)
참고문헌 신청
1. [학술지(정기간행물)] - Azar, L. / 2000 / Beam Focusing Behavior of Linear Phased Arrays / NDT&E International 33 : 189 ~ 198
2. [학술지(정기간행물)] - Casula, O. / 2006a / Control of Complex Components with Smart Flexible Phased Arrays / Review of Progress in QNDE 25 : 829 ~ 836
3. [학술지(정기간행물)] - Casula, O. / 2006 / Control of Complex Components with Smart Flexible Phased Arrays / Ultrasonics 44 : 647 ~ 651
4. [학술지(정기간행물)] - Chakroun, N. / 1995 / Time Reversal Processing in Ultrasonic Nondestructive Testing / IEEE Trans. Ultrason. Ferroelectr. Freq. Control 42 : 1087 ~ 1098
5. [학술지(정기간행물)] - Holmes, C. / 2005 / Post-Processing of the Full Matrix of Ultrasonic Transmit-Receive Array Data for Non-Destructive Evaluation / NDT&E International 38 : 701 ~ 711
2. [학술지(정기간행물)] - Casula, O. / 2006a / Control of Complex Components with Smart Flexible Phased Arrays / Review of Progress in QNDE 25 : 829 ~ 836
3. [학술지(정기간행물)] - Casula, O. / 2006 / Control of Complex Components with Smart Flexible Phased Arrays / Ultrasonics 44 : 647 ~ 651
4. [학술지(정기간행물)] - Chakroun, N. / 1995 / Time Reversal Processing in Ultrasonic Nondestructive Testing / IEEE Trans. Ultrason. Ferroelectr. Freq. Control 42 : 1087 ~ 1098
5. [학술지(정기간행물)] - Holmes, C. / 2005 / Post-Processing of the Full Matrix of Ultrasonic Transmit-Receive Array Data for Non-Destructive Evaluation / NDT&E International 38 : 701 ~ 711
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UCI(KEPA) : I410-ECN-0101-2014-500-003270386