Optical Heterodyne Strain Sensor.
Abstract
It has been demonstrated that heteordyne optical strain sensing can be used to measure both static and vibratory strains to a range of 2000 microstrain with a sensitivity approaching one microstrain and an accuracy approaching one percent. The theoretical and experimental work undertaken to develop a heteordyne optical strain sensing system, as described herein, includes: 1) the fabrication of a prototype device; 2) a system evaluation study; and 3) application to a beam, turbine blade and crack detection. In addition to a detailed discussion of the results, the principles of heterodyne optical strain measurements, as originally conceived at the United Technologies Research Center, are presented. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1981
- Accession Number
- ADA110288
Entities
People
- Karl A. Stetson
- Robert K. Erf
Organizations
- United Technologies Corporation