A high efficiency polarizing interferometer for astronomical observations in the submillimetric region

Details A high efficiency polarizing interferometer for astronomical observations in the submillimetric region A high efficiency polarizing interferometer for astronomical observations in the submillimetric region

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986infph..26..347a&link_type=abstract

Infrared Physics (ISSN 0020-0891), vol. 26, Nov. 1986, p. 347-352.

Astronomy and Astrophysics

Astrophysics

3

Astrophysics, Infrared Spectroscopy, Michelson Interferometers, Microwave Interferometers, Polarized Electromagnetic Radiation, Faint Objects, Infrared Astronomy, Performance Prediction, Prototypes, Signal To Noise Ratios

Scientific paper

The design and performance of a prototype high-efficiency low-resolution polarizing interferometer for use as a focal-plane Fourier spectrometer in ground-based 3-30/cm (90-900-GHz) astronomical observations of cold objects are reported. The instrument is a signal-doubling-configuration Fabry-Perot interferometer operating in a step-and-integrate mode and employs a cooled Ge-Ga composite detector with electrical NEP 50 pW/sq rt Hz, corresponding to sensitivity 12.5 Jy per spectral interval for 1 h of observations under good sky conditions with the f/20 TIRGO telescope, or 3 Jy for a 3.6-m telescope. In test observations of the moon performed at TIRGO in April 1984, noise equivalent flux density 1.4 kJy/sq rt Hz was obtained with the detector working at a nonoptimal temperature; sensitivity of a few Jy is predicted for optimum operation with a low-noise (NEP of a few pW/sq rt Hz) detector.

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