Yitzhak N M, Ruppin R, Hareuveny R
Radiation Safety Division, Soreq NRC, Yavne, Israel.
Phys Med Biol. 2009 Jul 7;54(13):4037-49. doi: 10.1088/0031-9155/54/13/006. Epub 2009 Jun 5.
A generalized theoretical model for evaluating the amplitudes of the sound waves generated in a spherical head model, which is irradiated by microwave pulses, is developed. The thermoelastic equation of motion is solved for a spherically symmetric heating pattern of arbitrary form. For previously treated heating patterns that are peaked at the sphere centre, the results reduce to those presented before. The generalized model is applied to the case in which the microwave absorption is concentrated near the sphere surface. It is found that, for equal average specific absorption rates, the sound intensity generated by a surface localized heating pattern is comparable to that generated by a heating pattern that is peaked at the centre. The dependence of the induced sound pressure on the shape of the microwave pulse is explored. Another theoretical extension, to the case of repeated pulses, is developed and applied to the interpretation of existing experimental data on the dependence of the human hearing effect threshold on the pulse repetition frequency.
建立了一个广义理论模型，用于评估在受微波脉冲照射的球形头部模型中产生的声波振幅。针对任意形式的球对称加热模式求解了热弹性运动方程。对于先前处理过的在球心处达到峰值的加热模式，结果与之前给出的结果一致。将广义模型应用于微波吸收集中在球体表面附近的情况。结果发现，对于相等的平均比吸收率，由表面局部加热模式产生的声强与由在中心处达到峰值的加热模式产生的声强相当。探讨了感应声压对微波脉冲形状的依赖性。开发了另一个理论扩展，用于重复脉冲的情况，并将其应用于解释关于人类听觉效应阈值对脉冲重复频率依赖性的现有实验数据。
