title: Measurement of difference deformation using speckle interferometry.
abstract: An application of speckle interferometry is presented that allows one to compare the resistance to stress of two nominally identical specimens. The interference pattern gives contours of equal differences in displacements of the two stressed specimens. The method is briefly developed, and its experimental feasibility is demonstrated by comparing the deflections of two square plates clamped along the edges and subjected to centrally concentrated loads.
authors.affiliation: Laboratory of Stress Analysis, Swiss Federal Institute of Technology, Lausanne, CH-1015 Lausanne, Switzerland.
authors.forename: P K
authors.initials: PK
authors.lastname: Rastogi
authors.forename: P
authors.initials: P
authors.lastname: Jacquot