Applications of computer-generated holograms in optical testing
Abstract
Various encoding methods for making computer generated holograms are discussed, and a new method is presented that can easily be used on image recorders intended for image processing applications. This general encoding method has many characteristics in common with earlier computer generated holograms. Examples are given to demonstrate the properties of synthetic holograms and the differences among different encoding techniques. A computer ray trace code was developed to model the optical performance of equipment used in optical testing. A detailed prescription is given for making a computer generated hologram for a commercial interferometer designed for use with holograms. Problems of finding the proper focal point, the correct hologram size, and preparation of the final hologram image are discussed. An example of an actual test is included. Finally, an analysis of various errors encountered and the limitations of the methods used is presented. Within these limitations, computer generated holograms can easily and routinely be used to test aspheric optical components.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- December 1980
- Bibcode:
- 1980PhDT........59L
- Keywords:
-
- Computer Graphics;
- Hologrammetry;
- Interferometers;
- Optical Measurement;
- Holographic Interferometry;
- Imaging Techniques;
- Optical Measuring Instruments;
- Phase Contrast;
- Instrumentation and Photography