Efficient elastic reverse-time migration for decomposed P-wavefield using stress tensor in time domain

Ha, Jiho; Shin, Sung Ryul; Chung, Wookeen; Shin, Changsoo

doi:10.1190/segam2014-0974.1

Cited by 1 publication

(2 citation statements)

References 14 publications

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“…To enhance the smoothness of the damage images, absolute values were performed on the attained images. 40 Similar effects can be also achieved using envelope functions. 41,42 However, the pixel values in this image, with an amplitude-squared unit, do not reflect the accurate relative damage image intensity if there are multiple sites of damage, each with different distances to the scan area and the actuator.…”

Section: A Nzlcc Imaging Condition: Stepmentioning

confidence: 80%

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Lamb-wave-based two-dimensional areal scan damage imaging using reverse-time migration with a normalized zero-lag cross-correlation imaging condition

Fang

2016

Structural Health Monitoring

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This article presents a two-dimensional, non-contact, areal scanning system to image and quantify multiple sites of damage in isotropic plates using reverse-time migration with a normalized zero-lag cross-correlation imaging condition. The hybrid system composed of a single piezoelectric actuator mounted onto the structure and a laser Doppler vibrometer for two-dimensional scan. The laser Doppler vibrometer scanned a region in the vicinity of the lead zirconate titanate actuator to capture the scattered wavefield introduced by the damage. The proposed damage imaging technique takes into account the amplitude, phase, and all the frequency content of the single-mode Lamb waves propagating in the plate; thus, the size of multiple sites of damage can be imaged without bias, regardless of the damage locations. Damage image quality was used as a metric to compare two-dimensional areal scans and linear scans as well as to compare the proposed method with existing imaging conditions. The experimental results show that the two-dimensional reverse-time migration/normalized zero-lag cross-correlation technique is capable of imaging and quantification of multiple damage sites in an aluminum plate using a single lead zirconate titanate actuator and a nearby, areal laser Doppler vibrometer scan.

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Section: A Nzlcc Imaging Condition: Stepmentioning

confidence: 80%

“…Similar to the processing to ZLCC images, additional absolute value was performed on the attained RTM/ZLCC images. 40 Other imaging conditions for RTM include the ratio of forward and backward wavefields 38 and excitation amplitude, 43 which may be used for NDE application as well.…”

Section: A Nzlcc Imaging Condition: Stepmentioning

confidence: 99%

Lamb-wave-based two-dimensional areal scan damage imaging using reverse-time migration with a normalized zero-lag cross-correlation imaging condition

Fang

2016

Structural Health Monitoring

View full text Add to dashboard Cite

show abstract

Efficient elastic reverse-time migration for decomposed P-wavefield using stress tensor in time domain

Cited by 1 publication

References 14 publications

Lamb-wave-based two-dimensional areal scan damage imaging using reverse-time migration with a normalized zero-lag cross-correlation imaging condition

Lamb-wave-based two-dimensional areal scan damage imaging using reverse-time migration with a normalized zero-lag cross-correlation imaging condition

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