A general analytic expression of light intensity distribution at the observation plane is obtained by means of ambiguity function method. Some special cases are discussed and verified by experiments.
运用模糊函数方法给出系统观察面上一个更为普遍的光强分布数学表达式，并分析讨论一些特殊情况及相应的实验结果。
Through the theoretical analysis, a function relation between the back-scattering light intensity and flue-dust concentration under the condition of lower concentration is received.
通过理论分析得出在烟尘浓度较低的情况下散射光强与烟尘浓度函数关系。
Distance measurement is realized by ultrasonic sensors, light intensity detection is achieved by photosensitive element, timer function is realized by 89c52's timer.
测距是利用超声波传感器来实现，光强检测是通过光敏元件实现，定时功能由89c52单片机定时器实现的。
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