Method and apparatus for real-time polarization difference...

Details Method and apparatus for real-time polarization difference... Method and apparatus for real-time polarization difference...

2006-06-28

2008-11-04

Stafira, Michael P (Department: 2886)

Optics: measuring and testing

By polarized light examination

Reexamination Certificate

active

07446871

ABSTRACT:
A method and apparatus for real-time polarization difference imaging (PDI) video including an imaging lens focusing the light on to a collimating lens, whereby the stimulus beams becomes parallel before striking a polarizing beam-splitter. Segregated orthogonally polarized components of the stimulus are then focused on imaging sensors, and one sensor's output signal is subtracted from the other, thereby creating a real-time polarization difference video image. The efficiency of such a system is greatly enhanced by illuminating the target with a polarized light source (with a polarization orientation matching one of those used in the PDI process), and PDI-enhanced targets can be constructed with surface features and textures optimised to result in a maximum return signal strength and spatial contrast.

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patent: 2006/0192960 (2006-08-01), Rencs et al.
patent: 2 153 071 (1985-08-01), None
patent: 9-145329 (1997-06-01), None

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