Abstract
The traditional concepts considered that only off-plane displacement can be obtained by the shadow moire method, but the slope moire fringes must be obtained from the specimen with mirror surface by the reflection moire method, etc. However, our recent experimental results reveal that the off-plane displacement fringe and the slope fringe appear together in a shadow moire pattern under experimental definitions. The basic principle and related experiment techniques are presented firstly in this paper. Two examples, a thin hyperboloidal shell and a thin cylindrical shell with local buckling, are given to demonstrate the actual coupled moire fringe patterns. Moreover, two distribution curves of δ<i>W</i>/δ<i>x</i> and <i>W</i> along asymmetry axis on the thin hyperboloidal shell are also calculated.
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