A novel technique for visualizing ultrasonic waves in general solid media by pulsed laser scan

Yashiro, Shigeki; Takatsubo, Junji; Miyauchi, Hidekazu; Toyama, Nobuyuki

doi:10.1016/j.ndteint.2007.08.002

Cited by 82 publications

(37 citation statements)

References 13 publications

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“…Experimental methods such as Schlieren imaging and Laser interferometry have been used for wave field imaging in the past [1][2][3][4][5]. Even though Laser methods are very fast and accurate, they are costly.…”

Section: Objective and Literature Surveymentioning

confidence: 99%

Visualization studies of Lamb wave propagation and interactions with anomalies in composite laminates using air-coupled ultrasonics

Durvasula¹,

Madhavan²,

M³

et al. 2014

AIP Conference Proceedings

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An experimental method to visualize the propagation of ultrasonic Lamb waves in composite plates with delaminations, using air coupled ultrasonic transducers, is described here. Using this method experiments are done, on glass fiber reinforced plastic(GFRP) laminates, to study the Lamb wave interactions with delamination type defects. The S 0 and A 0 modes are chosen for experiments at an excitation frequency of 200 kHz. Defect dimensions are calculated from the visualization images and compared with actual values. A method for detecting depth of defects using deviation of wave-fronts, at the defect contours, is presented.

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Section: Objective and Literature Surveymentioning

confidence: 99%

Visualization studies of Lamb wave propagation and interactions with anomalies in composite laminates using air-coupled ultrasonics

Durvasula¹,

Madhavan²,

M³

et al. 2014

AIP Conference Proceedings

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“…In this system, the elastic waves that are thermoelastically generated through pulsed laser scanning propagate through the solid material specimen and are received by the transducer attached to the specimen surface. Under the assumption of the reciprocity principle of wave propagation [5], it can be observed that the waves are transmitted from the transducer and they propagate through the material. An aluminum alloy specimen, 40-mm long, 40-mm wide, 15-mm thick, and with a φ5.6-mm cylindrical hole at its center, is considered.…”

Section: Measurement System and Data Processingmentioning

confidence: 99%

“…The authors have developed an imaging system using pulsed laser scanning [4], [5]. It is clarified that in this system, the defect center location can be detected from a snapshot image immediately following the reflection from the defect [6].…”

Section: Introductionmentioning

confidence: 99%

Detection of wavefront using Hough transform from time-sequential images recorded by pulsed laser scan

Yamamoto¹,

Miyauchi²,

Tsuda³

et al. 2013

2013 IEEE Antennas and Propagation Society International Symposium (APSURSI)

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The center location of the side hole (defect) in a solid material is roughly estimated using Hough transform. The measurement data recorded by a pulsed laser scanning system is used for the estimation. The incident and scattering wavefronts are characterized as the plane and conical tracks, respectively, using the stored data. The center location of the side hole is reasonably detected as the vertex coordinates of a conical track that is circularly scattered from the hole with the passage of time, after data preprocessing.

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“…Here, the key point of the present technique is to exchange the generation and the non-contact reception: ultrasonic waves are generated at grid points by a scanning pulsed laser, and the signal is received by a fixed piezoelectric transducer. Based on the reciprocity principle in wave propagation, 16) the waveforms obtained by the system with the scanning generation and the fixed reception are the same as the data set of the conventional approach. The amplitude of each waveform at time t is then plotted on a contour map, which corresponds to a snapshot of the wave propagation.…”

Section: Procedures For Imaging Wave Propagationmentioning

confidence: 99%

“…The authors developed a technique for imaging wave propagation by using a scanning pulsed laser for generation, and employed this technique to detect bonding damage in a CFRP skin/hat-stringer structure 15) and artificial corrosion damage in a steel elbow-pipe. 16) Although these studies [14][15][16] indicated usefulness of the wave propagation images for damage detection, to our knowledge, no study has been reported on engineering applications of the imaging techniques and on the possibility for characterizing damage.…”

Section: Introductionmentioning

confidence: 99%

Laser-Generation Based Imaging of Ultrasonic Wave Propagation on Welded Steel Plates and Its Application to Defect Detection

et al. 2010

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This study investigated nondestructive testing of welded steel plates by imaging ultrasonic wave propagation based on laser generation. The specimens were scanned by a pulsed laser, and the signals were received by a fixed piezoelectric transducer. A moving diagram of wave propagation from the fixed point was obtained directly from the collected signals. Wave scattering due to a weld defect (e.g., toe crack or root crack) was successfully imaged on weld specimens, and was easily recognized by visual observation in the measured moving diagrams. These experiments demonstrated the ability of the imaging technique to inspect a large area in a short time and to reliably detect a defect. Furthermore, the position-time-amplitude maps (B-scope images) were reconstructed from the moving diagram along some lines perpendicular to the defect, and the location and the size of a root crack were evaluated based on the B-scope images.

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A novel technique for visualizing ultrasonic waves in general solid media by pulsed laser scan

Cited by 82 publications

References 13 publications

Visualization studies of Lamb wave propagation and interactions with anomalies in composite laminates using air-coupled ultrasonics

Visualization studies of Lamb wave propagation and interactions with anomalies in composite laminates using air-coupled ultrasonics

Detection of wavefront using Hough transform from time-sequential images recorded by pulsed laser scan

Laser-Generation Based Imaging of Ultrasonic Wave Propagation on Welded Steel Plates and Its Application to Defect Detection

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