Development of a dual-plate technique for speckle photography
Abstract
The paper describes a two-laser speckle photographic method for measuring in-plane displacement which allows the user to cancel rigid body translation and rotation. The method involves making separate speckle photographs of a test specimen. One is made with no load on the specimen, while the second is made with the specimen loaded. A sandwich is constructed from the two photographs and data are recovered in a manner similar to that used in conventional speckle photography. The fringes generated during data recovery, however, are not strictly Young's fringes.
- Publication:
-
Society for Experimental Stress Analysis
- Pub Date:
- May 1976
- Bibcode:
- 1976sesa.meet.....M
- Keywords:
-
- Displacement Measurement;
- Laser Applications;
- Photographic Measurement;
- Photographic Plates;
- Speckle Patterns;
- Stress Analysis;
- Diffraction Patterns;
- Fraunhofer Lines;
- Photographic Film;
- Rigid Structures;
- Stress Distribution;
- Structural Strain;
- Instrumentation and Photography