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.
Highlights
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
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
Summary
Active ultrasonic testing is a powerful tool for medical diagnosis, material characterization and structural health monitoring [1,2,3,4]. PZTs are relatively bulky, susceptible to electromagnetic interference, and each transducer requires two electric wires for power supply and data transmission These disadvantages lead to significant limitations on the reliability and the number of transducers that can be imbedded in a structure. A straightforward way is to polish the cladding area all the way to the core and replace with absorption coatings at selected locations of a MMF for ultrasonic generation [6] In such a configuration, each of the transducers cannot be excited independently and only uses a portion of the laser light for ultrasonic generation, significantly limiting the number of transducers that can be multiplexed in a fiber and the strength of the generated ultrasound. We propose and demonstrate a novel approach that can efficiently make use of the optical power and generate ultrasound at multiple locations along the fiber in a controllable manner
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
