1) To determine the pain threshold for 94 GHz mm-wave irradiation in human subjects; 2) to extend earlier obeservations of the perception threshold for 94 GHz mm-wave irradiation; and 3) to develop a simple thermal model, based on the heat conduction equation, that would allow the accurate prediction of pain at other millimeter-wave frequencies.
|Exposure duration||3 s|
|Chamber||Exposure chamber/ 90 cm wide x 90 cm long x 180 cm high.|
|Additional info||A dielectric lens capable of focusing the output of the horn into a 4 cm diameter beam. The lens had a focal length of 90 cm and was placed 90 cm from the antenna. The lens was situated at 188 cm from the aperture of the exposure chamber.|
The study reports the thresholds for painful cutaneous sensation during stimulation by mm-wavelength microwaves, together with an analysis of the thermal response of skin in terms of a simple heat-conduction model. The data are in good agreement with the thermal model, with parameter values that agree well with those that have been reported in literature. The model may provide a basis for estimating the thresholds for pain and for perception of microwave energy over a large range of frequencies and exposure times.