Moire Gauging of Two Components of In-Plane Displacement

Abstract

The moire gauging technique proposed by Duffy is followed up and critical factors associated with the experiment are investigated. The technique is extended further to simultaneous measurement of two orthogonal components of in-plane displacement by the use of two pairs of small apertures located on apexes of a rhombus. The effect of out-of-plane displacement of the object under test is also studied.