VESDA;very early smoke detection apparatus

The very early transient electromagnetic responses in a layered earth is calculated and compared to the closed-form analytic expressions, the numerical algorithm is proved to be valid.

利用高密度采样的线性滤波算法计算余弦变换,对层状介质的甚早期瞬变电磁进行模拟,并与均匀半空间的闭合解析式结果进行对比,证明了该方法的有效性。