本文最后分析了光栅恰如一精密度尺，用于变形测量，但度尺与被测物不应为同一量级，因变形高频信号将被转换为衰逝波被光栅所阻挡。
However , the scale can 't measure an object with same order of magnitude because the deformed information of all the higher frequencies would be transformed into decaying waves arrested by the grating .
衰逝波