Laser Generation and Detection of Ultrasound in Concrete

by Laurence J. Jacobs, Georgia Inst of Technology, Atlanta, United States,



Document Type: Proceeding Paper

Part of: Structures Congress XII

Abstract:

Laser ultrasonics is a non-contact nondestructive evaluation method that uses lasers to generate and detect elastic waves. In this work, laser ultrasonics is used to produce broadband ultrasonic waveforms and investigate the effect of the concrete media on the amplitude and frequency content of these ultrasonic waves. Laser detection is accomplished with an interferometer and allows for the absolute measurement of ultrasonic pulses without interfering with the process being monitored. The sensor does not influence the frequency content of the waveforms being measured. In addition to being broadband generators and receivers of ultrasound, laser ultrasonic techniques have the potential for remote, non-contact evaluation of concrete components.

Subject Headings: Nondestructive tests | Lasers | Wave generation | Ultrasonic methods | Sensors and sensing | Frequency response | Concrete

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