Sensors, Vol. 25, Pages 6154: Resonant Ultrasound Spectroscopy Detection Using a Non-Contact Ultrasound Microphone

Sensors doi: 10.3390/s25196154

Authors:
Jake Pretula
Nolan Shaw
Ayden Chen
Kyle G. Scheuer
Ray G. DeCorby

We observed vibrational eigenmodes for a variety of millimeter-scale objects, including glass and sapphire lenses, by placing them on a piezoelectric ‘shaker’ driven by a broadband noise or frequency sweep signal, and using an optomechanical microphone to pick up their vibrational signatures emitted into the surrounding air. High-quality vibrational modes were detected over the ~0–8 MHz range for a typical object–microphone spacing of 1–10 mm. The observed eigenfrequencies are shown to be in excellent agreement with numerical predictions. Non-contact detection of resonant vibrational eigenmodes in the MHz ultrasound range could find application in the quality control of numerous industrial parts, such as ball bearings and lenses.

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Jake Pretula www.mdpi.com