Imaging polarimeter sensor with achromatic beam-splitting...

Optics: measuring and testing – By polarized light examination

Reexamination Certificate

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Reexamination Certificate

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07016040

ABSTRACT:
An imaging polarimeter sensor includes an achromatic beam-splitting polarizer that receives a polychromatic image beam of a scene and simultaneously produces a first polarized polychromatic image beam and a second polarized polychromatic image beam. The second polarized polychromatic image beam is of a different polarization than the first polarized polychromatic image beam and is angularly separated from the first polarized polychromatic image beam. The achromatic beam-splitting polarizer preferably includes a Wollaston prism through which the polychromatic image beam passes, and at least one grating through which the polychromatic image beam passes either before or after it passes through the Wollaston prism. An imaging detector receives the first polarized polychromatic image beam and the second polarized polychromatic image beam and produces an output image signal responsive to the first polarized polychromatic image beam and the second polarized polychromatic image beam.

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Courtial J et al: “Design of a Static Fourier-Transform Spectrometer with Increased Field of View” Applied Optics, Optical Society of America, Washington, US, vol. 35, No. 34, Dec 1, 1996, pp. 6698-6702, XP000640855 ISSN: 0003-6935, * p. 6700, col. 2, line 15 - p. 6701, col. 1 line 27; figures 1.5* p. 6699, col. 1, lines 6,7.

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