Speckle averaging system for laser raster-scan image projection

Details Speckle averaging system for laser raster-scan image projection Speckle averaging system for laser raster-scan image projection

1995-07-03

1998-03-17

Nelms, David C.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359220, 359223, 359226, G02B 2608

Patent

active

057293740

ABSTRACT:
The viewers' perception of laser speckle in a laser-scanned image projection system is modified or eliminated by the addition of an optical deflection system that effectively presents a new speckle realization at each point on the viewing screen to each viewer for every scan across the field. The speckle averaging is accomplished without introduction of spurious imaging artifacts.

REFERENCES:
patent: 5313479 (1994-05-01), Florence
Leger et al., Real-time measurement of surface roughness by correlation of speckle patterns, Nov. 1976, vol. 66, No. 11, 1210-1217, J. OptSoc of Am.
Tsuruta et al., Formation and localization of holographically produced interference fringes, 1969, vol. 16, No. 6, 723-733, Optica Acta.
Leger et al., Optical Surface Roughness Determination Using Speckle Correlation Technique, Apr. 1975, vol. 14, No. 4, 872-877, Applied Optics.
Archbold et al., Displacement measurement from double-exposure laser photographs, 1972, vol. 19, No. 4, 253-271 Optica Acta.

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