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Vision-Based Large-Area Damage Inspection Via Ultrasonic Phase Estimation in Laser Speckle Interferometry.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Vision-Based Large-Area Damage Inspection Via Ultrasonic Phase Estimation in Laser Speckle Interferometry./
作者:	Fong, Rey-Yie.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
面頁冊數:	344 p.
附註:	Source: Dissertations Abstracts International, Volume: 83-05, Section: B.
Contained By:	Dissertations Abstracts International83-05B.
標題:	Conventions. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28814857
ISBN:	9798494456205

Vision-Based Large-Area Damage Inspection Via Ultrasonic Phase Estimation in Laser Speckle Interferometry.
Fong, Rey-Yie.

Vision-Based Large-Area Damage Inspection Via Ultrasonic Phase Estimation in Laser Speckle Interferometry. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 344 p.

Source: Dissertations Abstracts International, Volume: 83-05, Section: B.

Thesis (Ph.D.)--North Carolina State University, 2021.

This item must not be sold to any third party vendors.

FONG, REY-YIE. Vision-based Large-area Damage Inspection via Ultrasonic Phase Estimation in Laser Speckle Interferometry. (Under the direction of Dr. Fuh-Gwo Yuan).Laser speckle interferometry (LSI) techniques such as digital speckle pattern interferometry (DSPI), shearography (SG) and laser speckle photometry (LSP) rely on laser speckles as a sensing cloud in contrast to digital image correlation (DIC) using painted speckles to quantify the deformation. All above techniques are vision-based optical metrologies that can be applied for large-area damage inspection. LSI has the benefits to adjust to the laser emission power, coherence, field of view (FOV), and have the choice to correlate the images optically or numerically. It is more suitable for qualitative damage featuring while DIC is a more quantitative tool for strain measurement and structure characterization.A direct phase estimation (DPE) via Riesz transform from LSI speckles was proposed for large-area damage inspection. Commercial LSI systems rely on optical setups to extract phase information from intensity in which damage feature is encoded. Depending on the stress loading conditions, either temporal phase shifting (TPS) if quasi-static or steady-state prevails or spatial phase stepping (SPS) when transient state occurs needs to be implemented beforehand in the hardware for phase estimation. In contrast, DPE via Riesz transform numerically evaluates the phase instantly and can be combined with either a filter bank for multi-scale pyramid imaging or monogenic filters for multi-dimensional feature extraction.This research explores almost entire speckle related techniques for large-area damage inspection. The fullfield vision-based LSI system was demonstrated and verified on a honeycomb composite plate and C-17 aileron composite stiffened panel using this proposed DPE algorithm under two classes of loading: (I) lowfrequency thermal stress loading (~Hz) and (II) high-frequency steady-state vibration in ultrasonic frequency range for large-area inspection in near real-time. The visualized damage images agreed with images from the baseline of pulse laser/LDV, ultrasonic C-scan and X-ray CT scan. The DPE algorithm has a promising potential to apply on any optical metrology for instantaneous phase estimation and is capable of combining with selected imaging conditions for multi-damages blind detection.

ISBN: 9798494456205Subjects--Topical Terms:

3562375
Conventions.

Vision-Based Large-Area Damage Inspection Via Ultrasonic Phase Estimation in Laser Speckle Interferometry.
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