散射介质中多重散射太赫兹脉冲的时域统计特性

Temporal statistics of multiply scattered terahertz pulses in scattering medium

对散射介质中多重散射太赫兹脉冲的时域统计特性进行了分析.给出了时间延迟量取不同值时电场的概率分布、散射场强度及其概率分布、散射场实部和虚部的概率分布.由于脉冲的宽带特性及瞬间特性,多重散射场概率统计分布与不同时间延迟量有关,太赫兹脉冲多重散射场的统计特性分布是非平稳过程.

The temporal statistics of multiple scattered broadband terahertz pulses through a highly scattering medium is analyzed. The probability distribution function of the scattered field varies with the delay time. The probability distributions of the scattered field, and the real and imaginary components are discussed. Due to the broad bandwidth and the transient nature of the terahertz pulses, the statistics of the scattered field evolves over time and is therefore nonstationary. This analysis emphasizes that these measured fields are not stationary. We demonstrate that the nonstationary process is a direct consequence of the time dependence of the averaged intensity.