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A thorough formulation of acoustic coupling by high power microwaves (HPM) is presented. It is found that the coupling may arise from thermoacoustic effect, electrostrictive effect, and electronagnetic energy of dielectric polarization. The formulation takes into account dielectric discontinuities at material interfaces and tansient charcter of microwave pulses. The result shows that, through themacoustic...
Acoustic waves generated by pulsed microwaves have been cited as a mechanism for microwave hearing [1],[2],[3]. More recently it has been demonstrated that acoustic waves are transduced in dielectric objects simulating the ocular lens when exposed to pulsed microwaves [4]. The effect has also been cited as the operant mechanism for cellular damage in studies of the murine ocular lens in vitro [5]...
Experimental measurements on transient dielectric responses have shown that few materials actually follow Debye's theory of dielectrics relaxation. The existing theoretical explanation for the deviation from Debye's behaviour is that each material may possess a distribution of relaxation times (DRT). However, until now no physical explanation has ever been obtained for the distribution functions....
Recently there have been renewed interests in the fundamental theory of transient dielectric responses. It centers on the physical interpretation of the Curie-von Schweidler law for the depolarization current in a dielectric after a constant field is abruptly removed or applied [1]: J(t) = kt−n (ο < n < 1)(1) and on the asympototic frequency_dependence of the dielectric susceptibility, χ ∼ ω,...
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