Title :
Formation of hot spots in the human eye for plane wave exposures
Author :
Hirata, Akihiko ; Ushio, G. ; Shiozawa, T.
Author_Institution :
Dept. of Commun. Eng., Osaka Univ., Japan
fDate :
11/1/1999 12:00:00 AM
Abstract :
The interaction between the human eye and EM waves in the hot spot frequency range is investigated with the aid of the FDTD method. Numerical results show that hot spots appear in a certain frequency range, and the location and number of hot spots depend on the frequencies of the incident wave. In particular, hot spot formation is found to be mainly caused by the resonance due to the geometrical structure of the eye. Additionally, temperature rises in the human eye are calculated to assess the possibilities of microwave-induced cataract formation. The numerical estimate shows that the EM wave with the power density 22 mW/cm2 induces temperature rise 3.0 °C, the threshold temperature rise for cataract formation
Keywords :
biological effects of microwaves; biothermics; eye; finite difference time-domain analysis; health hazards; physiological models; vision defects; 700 MHz to 6.0 GHz; EM waves; FDTD method; geometrical structure; hot spot frequency range; hot spots; human eye; microwave-induced cataract formation; numerical estimate; plane wave exposures; power density; resonance; temperature rise; temperature rises; Eyes; Focusing; Frequency; Geometry; Humans; Resonance; Skin; Solid modeling; Temperature distribution; Temperature sensors;
Conference_Titel :
Microwave Conference, 1999 Asia Pacific
Print_ISBN :
0-7803-5761-2
DOI :
10.1109/APMC.1999.829912
