|3984802||Feature recognition system|
9. A feature recognition system for identifying an unknown signal source, mprising: First means for receiving a signal from the unknown signal source and producing a hologram thereof; Second means for receiving the hologram and for correlating it with a s...
|3970390||Multifrequency laser oscillator for holographic contouring|
A multifrequency laser oscillator which generates coherent light of two closely adjacent optical frequencies in rapid succession for recording contour holograms by the double exposure technique. The two light frequencies are selected by an optical interca...
|3934461||Multiple exposure holographic interferometer method|
Apparatus and method wherein a photographic plate is doubly exposed by pulsed laser illumination to record successive instants in the history of an object under consideration. The doubly exposed plate is then developed and the photograph or hologram is us...