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11 March 2015 Broadband ultrasonic sensor array via optical frequency domain reflectometry
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Abstract
We introduce a new approach for multiplexing fiber-based ultrasound sensors using Optical Frequency Domain Reflectometry (OFDR). In the present demonstration of the method, each sensor was a short section of Polyimide-coated single-mode fiber. One end of the sensing fiber was pigtailed to a mirror and the other end was connected, via a fiber optic delay line, to a 1X4 fiber coupler. The multiplexing was enabled by using a different delay to each sensor. Ultrasonic excitation was performed by a 1MHz transducer which transmitted 4μs tone-bursts above the sensor array. The ultrasound waves generated optical phase variations in the fibers which were detected using the OFDR method. The ultrasound field at the sensors was successfully reconstructed without any noticeable cross-talk.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Haniel Gabai, Idan Steinberg, and Avishay Eyal "Broadband ultrasonic sensor array via optical frequency domain reflectometry", Proc. SPIE 9323, Photons Plus Ultrasound: Imaging and Sensing 2015, 93231L (11 March 2015); https://doi.org/10.1117/12.2080234
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