Interferometers
SIRIS
The Stratospheric Infrared Interferometer Spectrometer (SIRIS) was first carried on Nimbus 3, to obtain temperature soundings of the atmosphere. It had eight detectors, Fastie-Ebert optics, and a 12-degree field of view. Additional information available at "http://euromet.meteo.fr/demos/courses/glossary/satellit.htm" [Summary provided by EuroMET]