利用偏振多通道相机进行激光散斑照相,研测振动物体的二维瞬态振型。拍摄一张散斑底片可同时记录振动物体在各不同位相下的一连串二维瞬态振型的全场分布信息。 The laser speckle photography was carried out by using a polarized multi-channel camera to study the two-dimensional transient mode shapes of the vibrating objects. Taking a speckle film can simultaneously record the full-field distribution of a series of two-dimensional transient modes under different phases of a vibrating object.