J. Mees et al., ASUR - AN AIRBORNE SIS RECEIVER FOR ATMOSPHERIC MEASUREMENTS OF TRACEGASES AT 625 TO 760 GHZ, IEEE transactions on microwave theory and techniques, 43(11), 1995, pp. 2543-2548
A heterodyne receiver making use of a SIS waveguide mixer with integra
ted horn and single backshort tuner has been built, It has been used f
or a series of airborne measurements of atmospheric trace gases, such
as HCl and ClO, above northern Europe during the winter of 1993 and 19
94. The receiver is suitable for measurements in the range of 625-760
GHz and shows stable operation in the airplane together with high sens
itivity. Best achieved noise temperatures are T-DSB = 310 K at 708 GHz
in the laboratory and T-SSB = 1500 K at 625 GHz for the complete syst
em in the airplane.