Airborne infrared polarimeter

Computer Science

Scientific paper

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Airborne Equipment, Computer Techniques, Infrared Instruments, Polarimeters, Remote Sensors, Atmospheric Scattering, Calibrating, Flight Tests, Least Squares Method, Minicomputers, Numerical Control, Polarization Characteristics

Scientific paper

An infrared polarimeter was built to measure the degree of linear polarization and the direction of vibration of radiation scattered upwards by clouds, between 1.1 and 3.5 microns, with a 1.5-deg field of view, using a rotating wire-grid polarization analyzer. A PbS detector is cooled to 192 K by condensing freon-13. This AEROPOL instrument operates under minicomputer control, giving a polarization least-squares solution every 2.5 s. The polarimeter was flown on the NASA CV-990 aircraft, in a remote-sensing study of terrestrial cloud particle sizes and shapes.

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