SEPARATION OF ADDITIVE AND SUBTRACTIVE MOIRE PATTERNS,
Abstract
A spatial filtering technique for observing several different moire patterns in the same image of superposed gratings and for separating them at will, is described. In addition to the commonly observed moire pattern, and the equivalent patterns obtained by fringe sharpening or multiplication, patterns can be observed that correspond to different forms of the indicial equation describing the parametric properties of moire phenomena. In particular both the additive and subtractive moires are obtained individually, over the field. This method, combined with a previously developed method for obtaining spatial partial derivatives from deformed gratings (as a direct moire rather than moire of moire), permits the experimental determination of the whole field of Cartesian shears and rigid rotations. The method is applied to a circular ring subjected to diametral compression. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1969
- Accession Number
- AD0699601
Entities
People
- Augusto J. Durelli
- J. A. Clark
Organizations
- The Catholic University of America