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Dual-photoelastic-modulator-based polarimetric imaging concept for aerosol remote sensing

Show simple item record Diner, David J. Davis, Ab Hancock, Bruce Gutt, Gary Chipman, Russell A. Cairns, Brian 2008-08-08T22:41:04Z 2008-08-08T22:41:04Z 2007-12-03
dc.identifier.citation Applied Optics, Vol. 46, No. 35, p. 8428-8445,10 December 2007 en_US
dc.identifier.clearanceno 07-2298
dc.description.abstract A dual-photoelastic-modulator- (PEM-) based spectropolarimetric camera concept is presented as an approach for global aerosol monitoring from space. The most challenging performance objective is to measure degree of linear polarization (DOLP) with an uncertainty of less than 0.5% in multiple spectral bands, at moderately high spatial resolution, over a wide field of view, and for the duration of a multiyear mission. To achieve this, the tandem PEMs are operated as an electro-optic circular retardance modulator within a high-performance reflective imaging system. Operating the PEMs at slightly different resonant frequencies generates a beat signal that modulates the polarized component of the incident light at a much lower heterodyne frequency. The Stokes parameter ratio q = Q/I is obtained from measurements acquired from each pixel during a single frame, providing insensitivity to pixel responsivity drift and minimizing polarization artifacts that conventionally arise when this quantity is derived from differences in the signals from separate detectors. Similarly, u = U/I is obtained from a different pixel; q and u are then combined to form the DOLP. A detailed accuracy and tolerance analysis for this polarimeter is presented. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher Optical Society of America en_US
dc.subject dual photoelastic modulator (PEM) en_US
dc.subject degree of linear polarization (DOLP) en_US
dc.subject spectropolarimetric imaging
dc.title Dual-photoelastic-modulator-based polarimetric imaging concept for aerosol remote sensing en_US
dc.type Article en_US

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