Strain measurements using Fizzeau interferometry and photo-diode sensor in composite structuresA 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.
Document ID
19910067232
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Syed, Hazari I. (NASA Langley Research Center; Analytical Services and Materials, Inc. Hampton, VA, United States)
Balister, Raymond L. (Analytical Services and Materials, Inc. Hampton, VA, United States)