摘要
从Maxwell方程出发 ,推导了光在湍流中传播的调制传递函数的计算公式。依据折射率起伏相关函数的两种形式 ,计算了光学相位差。根据湍流的动能和动能耗散率输运方程 ,建立了折射率起伏方差的计算模型。最后 ,指出了文中所给公式的适用范围 ,对更好地进行调制传递函数的计算提出了建议。
The formula to calculate modulation transfer function (MTF) is deduced from Maxwell's equations when wave front propagates through turbulent flow.According to correlation function of th e refractivity fluctuations,the optical phase degradation is calculated.Based on turbulent kinetic energy and the rate of turbulent dissipation transport equati ons,the equation to calculate variance of the refractivity fluctuation is modele d.Finally,the limitations to the formulas are pointed out,and the suggestion s for the better calculation of MTF are given.
出处
《现代防御技术》
2000年第6期30-35,46,共7页
Modern Defence Technology
关键词
气动光学效应+
导引头
湍流
相位
折射率
Aerodynamic optical effect＋；Seeker
Turbule nt flow
Phase
Refractivity
