Principles of surface-phase-resolved shearography

  • DeWeert M
  • Acker A
  • Noguchi R
  • et al.
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Abstract

There is a need to remotely measure the full phase and amplitude information of small-scale acousto-seismic vibrations in order to detect the presence of buried objects (e.g., tunnels, etc.), or for other purposes. This remote sensing information may need to be collected with a large area coverage rate and at a safe standoff distance. To accomplish this, we have implemented a shearographic imaging system that incorporates phase stepping in a novel way, automatically separating random speckle noise from surface motion, without requiring an intermediate unwrapping step. This method, which we call surface-phase-resolved shearography, is especially effective for very low-amplitude motions that generate less than one light-wavelength of phase change. In laboratory studies, we have demonstrated sensitivity of two nanometers RMS with 532-nm-wavelength light. (C) The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License.

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APA

DeWeert, M. J., Acker, A. N., Noguchi, R., Yoon, D., & Sawai, G. (2019). Principles of surface-phase-resolved shearography. Optical Engineering, 58(11), 1. https://doi.org/10.1117/1.oe.58.11.114103

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