Accession Number:

AD0699601

Title:

SEPARATION OF ADDITIVE AND SUBTRACTIVE MOIRE PATTERNS,

Descriptive Note:

Corporate Author:

CATHOLIC UNIV OF AMERICA WASHINGTON D C SCHOOL OF ENGINEERING AND ARCHITECTURE

Personal Author(s):

Report Date:

1969-12-01

Pagination or Media Count:

25.0

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

Subject Categories:

  • Test Facilities, Equipment and Methods
  • Optics
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE