Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1994-02-04
1998-07-07
Turner, Samuel A.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
356360, G01B 902
Patent
active
057777420
ABSTRACT:
A system and method for three-dimensional imaging utilize a lens to perform a two-dimensional Fourier transform of an interference pattern while focusing the pattern on a two-dimensional detector array which is positioned in the image plane of the lens. This allows immediate previewing of the imaged object for proper positioning. Coherent energy beams are utilized to create a series of interference patterns, or image-plane holograms, each at a different frequency of the source energy beams. Furthermore, at each frequency, the relative phase between an object and a reference energy beam is varied to capture the complex values associated with the interference patterns. After capturing and storing the various interference patterns, a computer performs a one-dimensional Fourier transform, or other simplified processing to generate the three-dimensional image of the object. The image resolution extends to the micron range making this system and method easily adaptable to a variety of three-dimensional inspection applications.
REFERENCES:
patent: 4957367 (1990-09-01), Ducman
patent: 5384573 (1995-01-01), Turpin
patent: 5398113 (1995-03-01), de Groot
"Wavelength decorrelation of laser speckle from three-dimensional diffuse objects", by Joseph C. Marron, 1992 Elsevier Science Publishers B.V., Optics Communication.
"Three-dimensional, fine-resolution imaging using laser frequency diversity", Joseph C. Marron and Timothy J. Schultz, 1992 Optical Society of America, Optics Letters.
"Three-dimensional lensless imaging user laser frequency diversity", Joseph C. Marron and Kirk S. Schroeder, 1992 vol. 31, No. 2, Applied Optics.
Environmental research Institute of Michigan
Turner Samuel A.
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