Strain measurements using Fizzeau interferometry and photo-diode sensor in composite structures
Abstract
A system is presented which allows the measurement of very small changes of strain in real time and can be applied to the design of stable space structures. The Fizzeau interferometry technique is employed in conjunction with a tube dilatometer to generate a fringe pattern that expands and contracts with temperature variations. A photodiode array transforms the bulls eye fringes to video signals which can be analyzed to determine the strain in structural elements such as tubes.
- Publication:
-
36th International Instrumentation Symposium
- Pub Date:
- 1990
- Bibcode:
- 1990isa..symp...43S
- Keywords:
-
- Composite Structures;
- Fizeau Effect;
- Interferometry;
- Photodiodes;
- Strain Measurement;
- Diffraction Patterns;
- Digital To Analog Converters;
- Extensometers;
- Software Tools;
- Instrumentation and Photography