It is proved that combining converter holographic grating with lens can produce variable angle between reference light and object light and variable size of holographic facula.

At the first,the principle of speckle holography is intruduced briefly,then some influences upon power spectrum arised from the noise in real data is analysed and a method to correct the noise bias is discussed.

Particles interaction in separator inlet section diagnosed by laser holography;

Nondestructive test for phase objects by secondary exposure laser holography;

Two non-destructive laser inspection techniques of airplane tire——non-destructive laser holography inspection and laser digital stagger scatter spot inspection are described in terms of the work principle,inspection equipment,inspection method and the defect judgement.