High-resolution heterodyne spectrometer for the KAO (Kuiper Airborne Observatory)

Hans-Peter Roeser

doi:10.1117/12.185836

14 September 1994 High-resolution heterodyne spectrometer for the KAO (Kuiper Airborne Observatory)

Hans-Peter Roeser

Proceedings Volume 2268, Infrared Spaceborne Remote Sensing II; (1994) https://doi.org/10.1117/12.185836
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

A heterodyne receiver system for 700 to 3,000 GHz has been successfully used aboard the Kuiper Airborne Observatory since 1985. With this instrument several first high-resolution detection of CO (J equals 7 - 6, 9 - 8, 11 - 10, 12 - 11, 14 - 13) were performed. The down-converted signal is amplified by low-noise amplifiers and decomposed by an acousto-optical spectrometer. It has a maximum bandwidth of 1,400 MHz with a resolution of 1.5 MHz. At 3,000 GHz this yields an instantaneous velocity range of 170 km/sec with a resolution of 0.2 km/sec. The sensitivity of the whole system is given by the system noise temperature, e.g. T_sys equals 6,400 K (NEP equals 1 X 10^-19 W/Hz) at 2,500 GHz and 2,300 K (3 X 10^-20 W/Hz) at 800 GHz.

Citation Download Citation

Hans-Peter Roeser "High-resolution heterodyne spectrometer for the KAO (Kuiper Airborne Observatory)", Proc. SPIE 2268, Infrared Spaceborne Remote Sensing II, (14 September 1994); https://doi.org/10.1117/12.185836

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