Phased laser diode array permits selective excitation of ultrasonic guided waves in coated bone-mimicking tubes
Moilanen, P., Salmi, A., Kilappa, V., Zhao, Z., Timonen, J., & Hæggström, E. (2017). Phased laser diode array permits selective excitation of ultrasonic guided waves in coated bone-mimicking tubes. Journal of Applied Physics, 122(14), Article 144901. https://doi.org/10.1063/1.5007224
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Journal of Applied PhysicsAuthors
Date
2017Copyright
© AIP Publishing, 2017. Published in this repository with the kind permission of the publisher.
This paper validates simulation predictions, which state that specific modes could be enhanced in
quantitative ultrasonic bone testing. Tunable selection of ultrasonic guided wave excitation is
useful in non-destructive testing since it permits the mediation of energy into diagnostically useful
modes while reducing the energy mediated into disturbing contributions. For instance, it is often
challenging to distinguish and extract the useful modes from ultrasound signals measured in bone
covered by a soft tissue. We show that a laser diode array can selectively excite ultrasound in bone
mimicking phantoms. A fiber-coupled diode array (4 elements) illuminated two solid tubes
(2–3 mm wall thickness) embraced by an opaque soft-tissue mimicking elastomer coating (5 mm
thick). A predetermined time delay matching the selected mode and frequency was employed
between the outputs of the elements. The generated ultrasound was detected by a 215 kHz piezo
receiver. Our results suggest that this array reduces the disturbances caused by the elastomer cover
and so pave way to permit non-contacting in vivo guided wave ultrasound assessment of human
bones. The implementation is small, inexpensive, and robust in comparison with the conventional
pulsed lasers.
...
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American Institute of PhysicsISSN Search the Publication Forum
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https://converis.jyu.fi/converis/portal/detail/Publication/27281983
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