The use of random wave surfaces for the optical measurement of very small displacements of diffusing objects and the determination of their statistical properties - The interpretation of experiments with 'random moires'
Abstract
A generalization of moire systems has been adopted to interpret phenomena resulting from the illumination of a diffuse object by a fringe pattern formed with two symmetrical laser beams. The moire interpretation is then used to measure transverse vibrations of a diffuse surface in real time, and to create a linear displacement transducer. The random moire transducer is accurate to the subnanometer range. While providing a sensitivity comparable to that of interferometric techniques, the transducer requires only mechanical precision for its realization.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- May 1977
- Bibcode:
- 1977PhDT........19J
- Keywords:
-
- Diffraction Patterns;
- Laser Applications;
- Moire Effects;
- Random Processes;
- Vibration Measurement;
- Autocorrelation;
- Interferometry;
- Microstructure;
- Photometry;
- Speckle Patterns;
- Transducers;
- Transverse Oscillation;
- Instrumentation and Photography