Optics: measuring and testing – By polarized light examination
Reexamination Certificate
2006-04-04
2006-04-04
Nguyen, Tu T. (Department: 2877)
Optics: measuring and testing
By polarized light examination
Reexamination Certificate
active
07023546
ABSTRACT:
An imaging spectropolarimeter for measuring the polarization and spectral content and the spatial signature of a target scene. The imaging spectropolarimeter includes an objective optic for receiving an electromagnetic signal and a modulator for modulating the electromagnetic signal The amplitude of each frequency component of the resulting modulated electromagnetic signal is a function of the particular polarization state of each frequency component of the electromagnetic signal. A linear polarizer passes a single polarization of the modulated electromagnetic signal to a tunable filter, which is tunable through a frequency spectrum. The tunable filter outputs a plurality of electromagnetic signal samples at predetermined frequency increments. A focal plane array receives each electromagnetic signal sample and outputs a spectrum signal and a processor applies Fourier transformation to the spectrum signal to obtain at least one Stokes polarization vector component for each pixel within the scene.
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Nguyen Tu T.
The United States of America as represented by the Secretary of
USA Space and Missile Defense Command
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