【摘要】 本文从Lucovsky方程入手,根据rc传输线模型和理想脉冲响应函数,提出PSD线性时不变系统(LTI)的模型近似,并基于该模型得出一般模式点光源下的PSD的响应函数。光强随时间变化的点光源可以均匀分割成一系列时域脉冲信号,并近似认为是方波脉冲信号,在线性时不变系统情况下,该光源的电流响应近似等于这些方波脉冲信号的线性叠加。结果表明,PSD的一般响应函数是自身衰减因子和外界响应因子的乘积序列的叠加。此外,基于PSD一般响应函数的交流响应表明,PSD的响应电流对高频交变光信号不敏感,且随光强的变化滞后性震荡。更多还原

【Abstract】 A PSD is modeled as an approximate Linear Time Invariant(LTI) system based on the rc transmission line model and the impulse response obtained from Lucovsky equation.Based on the model,the PSD general response is derived.In our processing,a time-varying light signal is divided into many sections in time domain.Each section is regarded as a square-wave pulse.And the response is approximated to be a linear superposition of those pulse responses.Results show that the response is the summation of product of two factor sequences:one factor is the inherent decay factor and the other is the outer incentive response factor.In addition,analysis on Alternating Current(AC) response by virtue of the general response shows that there is hysteretic fluctuation with light intensity change and the current response is insensitive to high-frequency AC optical signals.更多还原