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根据光波在介质内的散射、折射特点,分析了脉冲链在参与性介质内经界面反射和介质散射后的叠加机理。导出了脉冲链入射非散射性半透明平板时透射比和反射率的解析解。利用间断有限元法和时间平移叠加法计算了脉冲链在一维散射性介质平板内传输的透射比和反射率。结果表明由于介质内部入射光与介质的相互影响,脉冲链受界面的反射和内部介质的散射,分裂成一系列时滞不同的子光波。经过不同的光学行程后,子光波叠加成离开平板的反射光波和透射光波。叠加效果随介质散射系数、脉冲宽度和脉冲时间间距发生变化。通过调节脉冲链的脉冲宽度和脉冲时间间距可得到不同波形的反射波和透射波。
According to the characteristics of light scattering and refraction in the medium, the superposition mechanism of the impulsive chain in the medium after interface reflection and medium scattering is analyzed. The analytical solutions of the transmittance and the reflectivity of the pulse chain incident on the non-scattering translucent plate are derived. The transmissivity and reflectivity of impulsive chains propagating in a one-dimensional scattering medium plate were calculated by using the discontinuous finite element method and time-shift superposition method. The results show that due to the interaction between the incident light and the medium inside the medium, the pulse chain is reflected by the interface and scattered by the internal medium and split into a series of sub-light waves with different time delays. After different optical strokes, the sub-light wave superposed to leave the plate of the reflected light and transmitted light waves. The superposition effect varies with the medium scattering coefficient, pulse width and pulse time spacing. By adjusting the pulse width of the pulse chain and the pulse time interval can be different waveforms of reflected waves and transmitted waves.