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以“热像”形成的衍射理论模型和分步傅里叶算法为基础,模拟研究了厚介质情况下“热像”的形成特点.重点分析了散射点调制系数(包括振幅调制和相位调制)、散射点与介质前表面之间的距离、散射点大小、入射光强等参数的变化对“热像”点位置以及强度的影响.数值模拟结果与解析理论结果进行了对比,在散射点调制系数和入射光强的变化对“热像”的影响两种情况下,得出了与解析理论基本一致的结论;在散射点大小的变化对“热像”的影响情况下,得出了与解析理论预言不同的结论.此外,还发现散射点与介质前表面距离为零时,在介质后表面也可能出现“热像”效应.
Based on the diffraction theory model and the step-by-step Fourier algorithm formed by the “thermal image”, the formation characteristics of “thermal image” under the condition of thick medium are simulated, and the modulation coefficients of scattering point (including amplitude modulation and phase modulation) , The distance between the scattering point and the front surface of the medium, the size of the scattering point, the incident light intensity and other parameters on the location and intensity of the “thermal image.” The numerical simulation results are compared with the analytical theoretical results. In the scattering point modulation Coefficient and incident light intensity changes on the “thermal image” in two cases, the conclusion is consistent with the analytical theory; the impact of changes in the size of the scattering point on the “thermal image” In addition, it is also found that when the distance between the scattering point and the front surface of the medium is zero, the “thermal image” effect may also appear on the back surface of the medium.