Infrared and Microwave Effects on Skin Heating and Temperature Sensation
E. HENDLER, J. D. HARDY · 1960
Researchers exposed the forehead area of seven subjects to controlled heating while measuring skin temperature radiometrically. Temperature sensation reports correlated best with the rate of change of skin temperature. Warmth threshold occurred at a skin temperature rise rate of 0.001°C/second and cool threshold at a fall rate of 0.005° °C/second. Microwave irradiation at about 17 mW/cm² produced a linear skin temperature increase of 0.037°C/second for the first 30 seconds. Warmth sensation persisted after microwave exposure ended, which the authors attributed to slowly dissipated heat retained in the tissues.