Novel method for increasing accuracy of projection moiré contouring of large surfaces.
Projection moiré is a high resolution, non-contact, full field method for measuring out-of-plane displacements. Here, we develop a novel model for projection moiré system and derive a universal formula expressing the relation between phase variation and out-of-plane displacement. In order to eliminate the error caused by mismatching of pixels and changing of sensitivity coefficient, an iterative algorithm is presented which expands measurements to the magnitude of depth of field. Computer simulations and actual experiments prove the validity of the proposed method.
Ying
Y
Tang
Jun
J
Yao
Jubing
J
Chen