ISSN:
1572-9559
Keywords:
water vapor spectroscopy
;
submillimeter-wave radiometry
;
heterodyne radiometer
;
submillimeter-wave oscillator
;
frequency multiplier
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract A compact, solid state submillimeter-wave heterodyne radiometer has been developed and was used to measure spectral characteristics of a water vapor jet in a space simulation chamber. Features of the 557 GHz water vapor line profile were observed in significantly greater detail than in previous experiments through an increased sensitivity and improved frequency resolution (600 kHz). The local oscillator of the radiometer consisted of a frequency multiplication chain which was driven by an InP Gunn oscillator at 92.6 GHz, and which contained a frequency tripler and harmonic mixer in cascade. The front end of the receiver had a noise temperature of 4500 K (DSB) at 555 GHz, consumed 3 W and weighed 3 kg. This advance in technology is particularly relevant to submillimeter-wave radiometry from a space-based platform.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01011946
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