Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/235024
Title: NON-CONTACT PHOTOACOUSTIC WAVE DETECTION TECHNIQUES FOR INSPECTION OF METALS STRUCTURES
Authors: MENG XIANYU
ORCID iD:   orcid.org/0000-0002-0959-113X
Keywords: photoacoustic detection techniques, lasers, inspection of metal structures, non-contact, elliptical reflector, water-coupling
Issue Date: 30-Jul-2022
Citation: MENG XIANYU (2022-07-30). NON-CONTACT PHOTOACOUSTIC WAVE DETECTION TECHNIQUES FOR INSPECTION OF METALS STRUCTURES. ScholarBank@NUS Repository.
Abstract: The Photoacoustic (PA) detection technique is a non-destructive inspection technique, which can be grouped into two operating modes, contact and non-contact. The contact mode has restrictions such as slow detection speed, possible contamination from couplants and difficulties in detecting irregular objects. On the other hand, the non-contact mode can overcome these restrictions, but it has low detection efficiency when encountering rough sample surfaces. In this thesis, to overcome the limitations of non-contact detections, all-optical detection is studied, and then an enhanced all-optical detection with an elliptical reflector on rough surfaces is proposed. Secondly, to improve the limitations of contact-based ultrasonic detection, a waterjet is proposed to enable non-contact detection for ultrasonic transducers. The proposed non-contact PA techniques can empower functionalities of PA detection in more demanding environments and conditions and may pave the road for more biomedical or industrial applications.
URI: https://scholarbank.nus.edu.sg/handle/10635/235024
Appears in Collections:Master's Theses (Open)

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