Proposal of Non Contact Inspection Method for Concrete Structures Using High-Power Directional Sound Source and Scanning Laser Doppler Vibrometer

Maintenance for concrete structures such as buildings, bridges, and tunnels is necessary, because it is thought that a lot of them show deterioration. As a periodic inspection, a hammering test is the most popular method. However, it has several problems. One of the problems is that it is difficult...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2013-07, Vol.52 (7), p.07HC12-07HC12-6
Main Authors: Akamatsu, Ryo, Sugimoto, Tsuneyoshi, Utagawa, Noriyuki, Katakura, Kageyoshi
Format: Article
Language:English
Subjects:
Concrete structures
Concretes
Contact
Inspection
Laser doppler vibrometers
Sound sources
Vibration
Walls
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Summary:Maintenance for concrete structures such as buildings, bridges, and tunnels is necessary, because it is thought that a lot of them show deterioration. As a periodic inspection, a hammering test is the most popular method. However, it has several problems. One of the problems is that it is difficult to inspect the places where people cannot reach. Therefore, non contact inspection methods have been developed. As a non-contact inspection method, we propose a system consisting of a high-power directional sound source and a scanning laser doppler vibrometer (SLDV). In this method, an air-borne sound wave is used for the excitation of a concrete wall, and then the vibration velocities on the concrete wall are measured two-dimensionally by the SLDV. From the vibration velocity, defective parts can be detected. In this paper, we describe two types of experiment on the feasibility of our proposed method. In these experiments, concrete wall test pieces, which have artificial defects, are used. From the experimental results, we confirmed the effectiveness of our proposed method as a non contact inspection method for concrete structures.
ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.52.07HC12