不同脉冲参数的微波对大鼠耳蜗热应力波影响的理论仿真OA
Theoretical simulation of the effects of microwaves with different pulse parameters on thermal stress waves in the cochlea of rats
通过数值模拟的手段研究了脉冲微波辐照引起的大鼠听觉效应.通过建立基于三维解剖结构的大鼠模型,用时域有限差分(FDTD)方法计算了不同上升沿和脉宽的微波辐照在大鼠体内的电磁能量吸收剂量.在此基础上,采用绝热近似,用FDTD方法进一步仿真了微波吸收产生的温升在大鼠体内激发的应力波.结果表明,在一定的脉冲宽度和辐照方式下的微波辐照时,大鼠模型体内激发的应力波(热声波)谱在人(鼠)的听觉系统可感知的频率范围内.根据仿真数据推算,在脉宽20 μs的EyHx辐照方式下,大鼠微波听觉效应阈值功率为0.6 kW/m2,这一结果与相关人体微波听觉效应的功率阈值接近.
A numerical simulation study was conducted to investigate the auditory effects in rats induced by pulsed microwave exposure.Based on a three-dimensional anatomically realistic rat model,the finite-difference time-domain(FDTD)method was employed to calculate the electromagnetic energy absorption in the rat body under microwave irradiation at different rise times and pulse widths.Subsequently,using the adiabatic approximation,the FDTD method was further applied to simulate the stress waves generated by the temperature rise caused by microwave absorption in the rat body.The results indicate that under specific pulse widths and irradiation conditions,the spectrum of the stress waves(thermoacoustic waves)excited in the rat model falls within the frequency range perceivable by the human(or rat)auditory system.Based on the simulation data,the threshold power for the microwave auditory effect in rats was estimated to be 0.6 kW/m2 under EyHx irradiation with a pulse width of 20 μs,a result that is consistent with the power threshold reported for the microwave auditory effect in humans.
王愉炜;张杰
华东师范大学物理学院 上海磁共振重点实验室 上海 200241华东师范大学物理学院 上海磁共振重点实验室 上海 200241
生物科学
微波听觉时域有限差分法耳蜗热应力波
Microwave hearingFinite-difference time-domain methodCochleaThermal stress wave
《辐射研究与辐射工艺学报》 2026 (3)
157-162,6
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