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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 35 — Dec. 10, 2007
  • pp: 8428–8445

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

David J. Diner, Ab Davis, Bruce Hancock, Gary Gutt, Russell A. Chipman, and Brian Cairns  »View Author Affiliations


Applied Optics, Vol. 46, Issue 35, pp. 8428-8445 (2007)
http://dx.doi.org/10.1364/AO.46.008428


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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.

© 2007 Optical Society of America

OCIS Codes
(120.5410) Instrumentation, measurement, and metrology : Polarimetry
(230.2090) Optical devices : Electro-optical devices
(280.1100) Remote sensing and sensors : Aerosol detection

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: August 7, 2007
Manuscript Accepted: October 8, 2007
Published: December 3, 2007

Citation
David J. Diner, Ab Davis, Bruce Hancock, Gary Gutt, Russell A. Chipman, and Brian Cairns, "Dual-photoelastic-modulator-based polarimetric imaging concept for aerosol remote sensing," Appl. Opt. 46, 8428-8445 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-35-8428

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