Fiber-optic ultrasonic transducers are an important component of an active ultrasonic testing system for structural health monitoring. Fiber-optic transducers have several advantages such as small size, light weight, and immunity to electromagnetic interference that make them much more attractive than the current available piezoelectric transducers, especially as embedded and permanent transducers in active ultrasonic testing for structural health monitoring. In this paper, a distributed fiber-optic laser-ultrasound generation based on the ghost-mode of tilted fiber Bragg gratings is studied. The influences of the laser power and laser pulse duration on the laser-ultrasound generation are investigated. The results of this paper are helpful to understand the working principle of this laser-ultrasound method and improve the ultrasonic generation efficiency.

Date Published: 29 May 2013
PDF: 7 pages
Proc. SPIE 8722, Fiber Optic Sensors and Applications X, 872208 (29 May 2013); doi: 10.1117/12.2018279

Published in SPIE Proceedings Vol. 8722:
Fiber Optic Sensors and Applications X
Eric Udd; Gary Pickrell; Henry H. Du; Jerry J. Benterou; Xudong Fan; Alexis Mendez; Stephen J. Mihailov; Anbo Wang; Hai Xiao, Editor(s)