Optical: systems and elements – Holographic system or element – Having optical element between object and recording medium
Patent
1996-07-29
1999-07-20
Henry, Jon W.
Optical: systems and elements
Holographic system or element
Having optical element between object and recording medium
359 11, 359 1, 359495, 359501, 356345, 356360, G03H 126, G01B 9021
Patent
active
059262958
ABSTRACT:
An optical device for generating a signal based on a distance of an object from the optical device. The optical device includes a first polarizer, a birefringent crystal positioned optically downstream from the first polarizer, and a second polarizer arranged optically downstream from the birefringent crystal. The second polarizer creates a pair of interferograms by adjusting a phase of the light. Two outputs are generated by separately integrating an amount of light of at least a part of each of the pair of interferograms. Finally, the two outputs are combined such that the signal, depending only on the distance between the object and the optical system, is obtained.
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Charlot Didier
Malet Yann
Henry Jon W.
Le Conoscope SA
Michaelson Peter L.
Pokotylo John C.
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