Abstract
ABSTRACT The Composite InfraRed Spectrometer (CIRS) instrument flying on the Cassini spacecraft to Saturn is acryogenic spectrometer with far-infrared (FIR) and mid-infrared (MIR) channels. The CIRS FIR channel is apolarization interferometer that contains three polarizing grid components. These components are an inputpolarizer, a polarizing beamsplitter, and an output polarizer/analyzer. They consist of a 1 .5 micron (pin)thick mylar substrate with 2 tm wide copper wires, with 2 im spacing (4 jim pitch) photolithographicallydeposited on the substrate. This paper details the polarization sensitivity studies performed on the outputpolarizer/analyzer, and the alignment sensitivity studies performed on the input polarizer and beamsplittercomponents in the FIR interferometer.Key words: far infrared, interferometry, polarization, beamsplitters, alignment, sensitivity 1. INTRODUCTION The CIRS instrument is one of twelve instruments currently flying on the CASSINI spacecraft en route toSaturn'.
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