A passive optical technique to remotely measure physical properties of a vibrating surface

Frank O. Clark; Ryan Penney; Wellesley E. Pereira; John Kielkopf; Jason Cline

doi:10.1117/12.2064366

12 September 2014 A passive optical technique to measure physical properties of a vibrating surface

Frank O. Clark, Ryan Penney, Wellesley E. Pereira, John Kielkopf, Jason Cline

Proceedings Volume 9219, Infrared Remote Sensing and Instrumentation XXII; 92190G (2014) https://doi.org/10.1117/12.2064366
Event: SPIE Optical Engineering + Applications, 2014, San Diego, California, United States

Abstract

We report on a passive imaging technique to measure physical properties of a vibrating surface using the detection of optical signal modulation in light scattered from that surface. The optical signal modulation arises from a changing surface normal and may be used to produce a surface normal change image without touching the surface and changing its state. The images may be used to extract the surface vibration frequency and mode pattern which are dependent on surface properties of the material, including its flexural modulus and mass density. Comparison of the vibration image with a finite element model may be used to infer properties of the vibrating surface, including boundary conditions. A temporal sequence of optical images of signal modulation may be analyzed to infer spatial damping properties of the surface material. Damping is a measure of energy dissipation within the material. The approach being developed has the advantage of being able to remotely image arbitrary sized structures to determine global or local vibrational properties.

Citation Download Citation

Frank O. Clark, Ryan Penney, Wellesley E. Pereira, John Kielkopf, and Jason Cline "A passive optical technique to measure physical properties of a vibrating surface", Proc. SPIE 9219, Infrared Remote Sensing and Instrumentation XXII, 92190G (12 September 2014); https://doi.org/10.1117/12.2064366

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