Measuring vibrational motion in the presence of speckle using off-axis holography

Applied Optics
Brandon ReddingAnthony Dandridge

Abstract

We present a holographic laser vibrometer designed to mitigate the effects of speckle noise when measuring the vibrational motion of a rough object. We show that multiplexing the interferometric measurement across 10<sup>5</sup> pixels provides a 50 dB reduction in the incoherent noise. Using a high-speed camera, this enables a displacement sensitivity of 50  fm/√Hz with a bandwidth of 12.5 kHz when measuring rough objects, representing a 20 dB improvement compared with a commercially available single-detector-based laser vibrometer. Finally, we show that the holographic vibrometer system is capable of stand-off acoustic sensing by measuring the acoustic-induced vibrations of a piece of paper with sensitivity as low as 10 dB (re 20 μPa). The ability to sensitively and noninvasively measure the vibrations of arbitrary rough surfaces could enable new applications in laser vibrometry.

References

May 19, 2006·Applied Optics·Giancarlo PedriniMikhail E Gusev
Jun 27, 2006·Applied Optics·Steve Rothberg
Apr 19, 2011·Optics Letters·Benjamin SamsonMichael Atlan
Jan 1, 2013·Sensing and Imaging·Habib TabatabaiChristopher Papadopoulos
May 15, 2015·Applied Optics·Julien PoittevinCharles Pézerat

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Citations

Apr 5, 2017·Applied Optics·Brandon Redding, Allen Davis
Nov 2, 2019·Applied Optics·S Bianchi, E Giacomozzi
Nov 7, 2019·Optics Express·Matthew J MurrayBrandon Redding

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