A CARRIER METHOD OF SPECKLE-SHEARING INTERFEROMETRY FOR INDIVIDUAL-COMPONENT PATTERNS OF IN-PLANE STRAIN

摘要

With single-beam illumination and double-film recording, two fringe carriers are introduced separately into double-exposure recording of speckle-shearing interferometry, so that the deformation of the specimen is recorded in the form of spatial modulation to the frequency of the carrier fringes. By Fourier transform optical-filtering, two strain-modulating fringe carriers are obtained, and these are then processed by digital image processing as grey level images, from which the pattern of the individual in - plane strain is acquired by subtraction of these images. [References: 9]