指出全息菲涅耳透镜是一种特殊类型的光栅。分析并说明光栅的标量衍射理论是计算衍射效率的一种近似方法，因此它的应用是有限制条件的。
We show and illuminate that the scalar diffraction theory is an approximation method to calculate the diffraction efficiency of grating, and there are restrictions on its application.
介绍了进行FDTD运算时处理边界条件和加速计算所采用的算法，说明了其激励类型和参数设定方法；
The boundary condition and the method of accelerating computation are introduced. Their excitation styles and the methods of setting parameter are illuminated.
文章对该类型调湿板在北京地区的应用效果进行了数值模拟，计算结果表明在北京的气候条件下，调湿板对办公型建筑的室内湿度调节有明显作用。
The numerical computation of indoor humidity of an office room in Beijing was carried. The results show that the hygrocsopic board can adjust the indoor humidity prominently.
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