Comparison of diurnal contrast changes for millimeter-wave and infrared imagery.
Far-infrared outdoor imagery has a lower contrast in the morning/afternoon relative to the highest contrast, which is observed at 14:00. Millimeter-wave (mmW) imagery can also follow this pattern. However, in this paper, we show that the opposite can occur for mmW imagery, wherein a higher contrast can occur in the morning/afternoon and lower contrast at 14:00. To this end, we show that a wood and rubber sample are observed to have a difference in mmW radiometric temperature of 17 degrees C at 9:00 and a difference of only 7 degrees C at 14:00. Details of our observations are presented.
Wilson
John P
JP
Department of Electrical and Computer Engineering, University of Delaware, Newark, Delaware 19716, USA. jwils@udel.edu
Mackrides
Daniel G
DG
Samluk
Jesse P
JP
Prather
Dennis W
DW