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Title: Dual-photoelastic-modulator-based polarimetric imaging concept for aerosol remote sensing
Authors: Diner, David J.
Davis, Ab
Hancock, Bruce
Gutt, Gary
Chipman, Russell A.
Cairns, Brian
Keywords: dual photoelastic modulator (PEM)
degree of linear polarization (DOLP)
spectropolarimetric imaging
Issue Date: 3-Dec-2007
Publisher: Optical Society of America
Citation: Applied Optics, Vol. 46, No. 35, p. 8428-8445,10 December 2007
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.
Appears in Collections:JPL TRS 1992+

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