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.
© 1987 Optical Society of America
Original Manuscript: December 1, 1986
Manuscript Accepted: February 22, 1987
Published: August 1, 1987
Pramod K. Rastogi and Pierre Jacquot, "Measurement of difference deformation using speckle interferometry," Opt. Lett. 12, 596-598 (1987)