Spherical lamellar grating interferometer for airborne astronomical observations of far infrared objects

Astronomy and Astrophysics – Astronomy

Scientific paper

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Airborne Equipment, Astronomical Spectroscopy, Far Infrared Radiation, Gratings (Spectra), Infrared Astronomy, Infrared Interferometers, Black Body Radiation, Collimation, Infrared Spectra, Jupiter (Planet)

Scientific paper

A lamellar-grating interferometer designed for airborne IR astronomy is described, and its response to a laboratory far-IR source and to Jupiter as viewed from NASA's Kuiper Airborne Observatory is discussed. The theory of lamellar-grating interferometers is reviewed, advantages over Michelson interferometers are noted, and the optical arrangement for the lamellar-grating instrument is indicated. The response of the instrument is illustrated using purged and unpurged spectra of a 1000-K blackbody source as well as a raw spectrum of Jupiter containing many absorption features (probably telluric) identified with rotation bands of H2O. It is noted that the interferometer's self-collimation allows for efficient operation with a minimum of auxiliary optics.

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