Distributed fiber-optic laser-ultrasound generation based on ghost-mode of tilted fiber Bragg gratings

Optics Express, Vol. 21, Issue 5, pp. 6109-6114 (2013).

Jiajun Tian, Qi Zhang, and Ming Han.

Department of Electrical Engineering, University of Nebraska–Lincoln, Lincoln, Nebraska 68588, USA.

Abstract

 

Active ultrasonic testing is widely used for medical diagnosis, material characterization and structural health monitoring. Ultrasonic transducer is a key component in active ultrasonic testing. Due to their many advantages such as small size, light weight, and immunity to electromagnetic interference, fiber-optic ultrasonic transducers are particularly attractive for permanent, embedded applications in active ultrasonic testing for structural health monitoring. However, current fiber-optic transducers only allow effective ultrasound generation at a single location of the fiber end. Here we demonstrate a fiber-optic device that can effectively generate ultrasound at multiple, selected locations along a fiber in a controllable manner based on a smart light tapping scheme that only taps out the light of a particular wavelength for laser-ultrasound generation and allow light of longer wavelengths pass by without loss. Such a scheme may also find applications in remote fiber-optic device tuning and quasi-distributed biochemical fiber-optic sensing.

© 2013 OSA

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Additional Information:

“This work was primarily supported by the Office of Naval Research under grant no. N000141110705 and grant no. N000141110262.”

 

Distributed fiber-optic laser-ultrasound generation based on ghost-mode of tilted fiber Bragg gratings