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Proceedings Paper

An integrated multiangle, multispectral, and polarimetric imaging concept for aerosol remote sensing from space
Author(s): David J. Diner; Russell A. Chipman; Neil A. Beaudry; Brian Cairns; Leslie D. Foo; Steven A. Macenka; Thomas J. Cunningham; Suresh Seshadri; Christoph U. Keller
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Paper Abstract

Techniques for passive remote sensing of aerosol optical and microphysical properties from space include visible, near- and shortwave-infrared imaging (e.g., from MODIS), multiangle intensity imaging (e.g., ATSR-2, AATSR, MISR), near-ultraviolet mapping (e.g., TOMS/OMI), and polarimetry (e.g., POLDER, APS). Each of these methods has unique strengths. In this paper, we present a concept for integrating these approaches into a unified sensor. Design goals include spectral coverage from the near-UV to the shortwave infrared; intensity and polarimetric imaging simultaneously at multiple view angles; global coverage within a few days; kilometer to sub-kilometer spatial resolution; and measurement of the degree of linear polarization (DOLP) for a subset of the spectral complement with an uncertainty of 0.5% or less. This high polarimetric accuracy is the most challenging aspect of the design, and is specified in order to achieve climate-quality uncertainties in optical depth, refractive index, and other microphysical properties. Based upon MISR heritage, a pushbroom multi-camera architecture is envisioned, using separate line arrays to collect imagery within each camera in the different spectral bands and in different polarization orientations. For the polarimetric data, accurate cross-calibration of the individual line arrays is essential. An electro-optic polarization "scrambler", activated periodically during calibration sequences, is proposed as a means of providing this cross-calibration. The enabling component is a rapid retardance modulator. Candidate technologies include liquid crystals, rotating waveplates, and photoelastic modulators (PEMs). The PEM, which uses a piezoelectric transducer to induce rapid time-varying stress birefringence in a glass bar, appears to be the most suitable approach. An alternative measurement approach, also making use of a PEM, involves synchronous demodulation of the oscillating signal to reconstruct the polarization state. The latter method is potentially more accurate, but requires a significantly more complex detector architecture.

Paper Details

Date Published: 11 January 2005
PDF: 9 pages
Proc. SPIE 5659, Enabling Sensor and Platform Technologies for Spaceborne Remote Sensing, (11 January 2005); doi: 10.1117/12.579050
Show Author Affiliations
David J. Diner, Jet Propulsion Lab. (United States)
Russell A. Chipman, Univ. of Arizona (United States)
Neil A. Beaudry, Univ. of Arizona (United States)
Brian Cairns, Columbia Univ. (United States)
Leslie D. Foo, Optical Research Associates (United States)
Steven A. Macenka, Jet Propulsion Lab. (United States)
Thomas J. Cunningham, Jet Propulsion Lab. (United States)
Suresh Seshadri, Jet Propulsion Lab. (United States)
Christoph U. Keller, National Solar Observatory (United States)

Published in SPIE Proceedings Vol. 5659:
Enabling Sensor and Platform Technologies for Spaceborne Remote Sensing
George J. Komar; Jinxue Wang; Toshiyoshi Kimura, Editor(s)

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