Abstract

The CIRRIS-1A spectroradiometer system is designed to obtain spectral and spatial airglow data on the shuttle platform over a global extent. The sensor system includes a Michelson interferometer which exhibits a noise equivalent sterance [radiance] (NER) of 2 × 10−13 W cm−2 sr−1 Hz−1/2; and at a resolution of 0.964 cm−1 (scan time 9.1 s) exhibits a noise equivalent spectral sterance [radiance] NESR of 7 × 10−14 W cm−2 sr −1/cm−1. The entire optical subsystem, silicon–arsenic focal-plane, off-axis high-rejection telescope, and removable cover are cooled below 20 K. The measured performance is shown to agree with theory to within a few percent. Noise-equivalent-sterance [radiance] per root–Hz is recommended as a figure of merit for interferometers that is independent of the specific operating conditions; i.e., mirror velocity, scan time or transform size.

© 1989 Optical Society of America

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