Three Dimensional Imaging with Multiple Wavelength Speckle Interferometry
We present the design, modeling, construction, and results of a three-dimensional imager based upon multiple-wavelength speckle interferometry. A surface under test is illuminated with tunable laser light in a Michelson interferometer configuration while a speckled image is acquired at each laser frequency step. The resulting hypercube is Fourier transformed in the frequency dimension and the beat frequencies that result map the relative offsets of surface features. Synthetic wavelengths resulting from the laser tuning can probe features ranging from 18 microns to hundreds of millimeters. Three dimensional images will be presented along with modeling results.
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- Conference: Proceedings of the SPIE: Dimensional Optical Metrology and Inspection for Practical Applications III, May 5, 2014, Baltimore, Maryland, 9110:91100A
- KG Harding and T Yoshizawa; SPIE, Bellingham, WA, United States(US).
- Research Org:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
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- United States
- speckle interferometry; synthetic wavelength