POLARIS-II - An acousto-optic imaging spectropolarimeter for ground-based astronomyA compact, acousto-optic tunable filter (AOTF) imaging spectropolarimeter for ground based astronomy from 400-1100 nm has been constructed at NASA/GSFC. The key components of this instrument are a TeO2 non-collinear AOTF, CCD camera, and an all-reflective optical relay assembly which uses a single elliptical mirror to produce side-by-side orthogonally polarized spectral images. The instrument was used at the Lowell Observatory 42-inch telescope for 'first light' planetary imaging and measurements of photometric standard stars. Narrow-band images of Saturn near 700 nm appear to show polarization effects which result from multiple scattering by aerosols. The instrument has recently been upgraded in order to integrate the RF drive electronics and eliminate contamination by scattered light. Design of the instrument and some initial results are presented.
Document ID
19930046033
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Glenar, D. A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hillman, J. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Saif, B. (Engineering and Economics Research, Inc. Seabrook, MD, United States)
Bergstralh, J. (JPL Pasadena, CA, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1992
Publication Information
Publication: In: Polarization and remote sensing; Proceedings of the Meeting, San Diego, CA, July 22, 23, 1992 (A93-30026 11-35)
Publisher: Society of Photo-Optical Instrumentation Engineers