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Updated: Jun 10, 2026

Infrared Thermography for the Detection of Changes in Brown Adipose Tissue Activity
Published on: September 28, 2022
Comparison of diurnal contrast changes for millimeter-wave and infrared imagery
John P Wilson1, Daniel G Mackrides, Jesse P Samluk
1Department of Electrical and Computer Engineering, University of Delaware, Newark, Delaware 19716, USA. jwils@udel.edu
Abstract:
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.
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