DocumentCode :
1407287
Title :
FDTD analysis of microwave hearing effect
Author :
Watanabe, Yoshiaki ; Tanaka, Toshiyuki ; Taki, Masao ; Watanabe, So-ichi
Author_Institution :
Dept. of Electr. Eng., Tokyo Metropolitan Univ., Japan
Volume :
48
Issue :
11
fYear :
2000
fDate :
11/1/2000 12:00:00 AM
Firstpage :
2126
Lastpage :
2132
Abstract :
This paper presents a numerical analysis of the thermoelastic waves excited by the absorbed energy of pulsed microwaves in a human head. First, the authors calculate the distribution of the specific absorption rate using a conventional finite-difference time-domain (FDTD) algorithm for the Maxwell´s equation. They then calculate the elastic waves excited by the absorbed microwave energy. The FDTD method is again applied to solve the elastic-wave equations. The validity of the analysis for elastic waves is confirmed through comparison of the FDTD results with the analytical solutions in a sphere model. Two anatomically based human head models are employed for numerical calculations. The waveforms of the calculated pressure waves are different from the previously reported ones. It is especially shown that the surface heating is important in exciting the fundamental mode of the pressure waves in the head. The pulsewidth dependency of the loudness of microwave hearing is clearly explained by the simulation with realistic head models. The peak pressure of elastic waves in the realistic head models is of the same order as the previously reported values obtained with a homogeneous sphere model. The strength of elastic wave is discussed in consideration of the safety of this phenomenon.
Keywords :
biological effects of microwaves; electromagnetic wave absorption; finite difference time-domain analysis; hearing; physiological models; FDTD analysis; absorbed energy; analytical solutions; anatomically based human head models; elastic-wave equations; microwave hearing effect; numerical analysis; pulsed microwaves; specific absorption rate distribution; sphere model; thermoelastic waves; Auditory system; Electromagnetic heating; Finite difference methods; Humans; Maxwell equations; Numerical analysis; Space vector pulse width modulation; Surface waves; Thermoelasticity; Time domain analysis;
fLanguage :
English
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9480
Type :
jour
DOI :
10.1109/22.884204
Filename :
884204
Link To Document :
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