New Optical Method to Determine Vibration-Induced Strains with Variable Sensitivity after Recording,
Abstract
A steady-state vibrating object is illuminated with coherent light and its image is slightly misfocused in the film plane of a camera. The resulting processed film is called a 'Time-integrated specklegram'. When the specklegram is Fourier filtered, it exhibits fringes depicting derivatives of the vibrational amplitude. The direction of the spatial derivative, as well as the fringe sensitivity may be easily and continuously varied during Fourier filtering process. Besides the above mentioned advantages, this new method is also much less demanding than hologrphic interferometry with respect to vibration isolation, optical set-up time, illuminating source coherence, required film resolution, etc. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1976
- Accession Number
- ADA032087
Entities
People
- Augusto J. Durelli
- J. D. Hovanesian
- Y. Y. Hung
Organizations
- Oakland University