双高斯(Double Gauss)/普兰那(Planar)镜头(基本设计:6片4组 前后对称)是在1896年发明的,而天塞(Tessar)镜头(基本设计:4片3组)是在1902年才发明的.
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依此原理，模拟了双高斯分布函数的投影，并由平行束卷积法重建出模拟的温度场。
On this foundation, it simulates the projections for double Gauss distribution function and reconstructs the simulating temperature field by the convolution method for parallel beam.
针对这个特点，采用更为细致的双高斯模型来模拟这种分布，并且使用EM算法来获得相应的模型参数。
For this character, to use more fine double Gauss model to simulate the distribution and to use EM principle to get the corresponding model coefficients is a good idea.
在综合大量实例的基础上，提出双高斯函数逼近多模光纤的光脉冲输出的解析近似方法，使时域法确定光纤带宽的精度大为提高。
On the base of a plenty of facts we suggested a method in which bi-Gaussian form is approached the output pulse in multimode fibers The accuracy measuring band in time domain can be improved highly.
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