Astronomy and Astrophysics – Astronomy
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992ssrv...60..531r&link_type=abstract
Space Science Reviews (ISSN 0038-6308), vol. 60, no. 1-4, May 1992, p. 531-563.
Astronomy and Astrophysics
Astronomy
15
Astronomical Polarimetry, Galileo Spacecraft, Jupiter Atmosphere, Radiometers, Satellite-Borne Instruments, Systems Engineering, Calibrating, Linear Polarization, Network Synthesis, Polarimeters, Structural Design
Scientific paper
The Photopolarimeter/Radiometer (PPR) is a remote sensing instrument on the Galileo Orbiter designed to measure the degree of linear polarization and the intensity of reflected sunlight in ten spectral channels between 410 and 945 nm to determine the physical properties of Jovian clouds and aerosols, and to characterize the texture and microstructure of satellite surfaces. The PPR also measures thermal radiation in five spectral bands between 15 and 100 microns to sense the upper tropospheric temperature structure. Two additional channels which measure spectrally integrated solar and solar plus thermal radiation are used to determine the planetary radiation budget components. The PPR photopolarimetric measurements utilize previously flown technology for high-precision polarimetry using a calcite Wollaston prism and two silicon photodiodes to enable simultaneous detection of the two orthogonal polarization components. The PPR radiometry measurements are made with a lithium tantalate pyroelectric detector utilizing a unique arrangement of radiometric stops and a scene/space chopper blade to enable a warm instrument to sense accurately the much colder scene temperatures.
Brown F. G.
Chandos R. A.
Fincher W. C.
Kubel L. F.
Lacis Andrew A.
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