Loading...
Please wait, while we are loading the content...
Optical strain measurement system development, phase 1
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Lant, Christian T. Qaqish, Walid |
| Copyright Year | 1987 |
| Description | A laser speckle, differential strain measurement system was built and tested for future applications in hostile environments. One dimensional electronic correlation of speckle pattern movement allows a quasi-real time measure of strain. The system was used successfully to measure uniaxial strain reaching into plastic deformation of a test specimen, at temperatures ranging to 450 C. A resolution of 16 microstrain is given by the photodiode array sensor pitch and the specimen to sensor separation. The strain measurement limit of the gauge is determined by air density perturbations causing decorrelation of the reference and shifted speckle patterns, and may be improved by limiting convective flow in the immediate vicinity of the test specimen. |
| File Size | 10847250 |
| Page Count | 39 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19870013527 |
| Archival Resource Key | ark:/13960/t0xq1wh84 |
| Language | English |
| Publisher Date | 1987-05-01 |
| Access Restriction | Open |
| Subject Keyword | Equipment Specifications Laser Outputs Component Reliability Stress-strain Relationships Temperature Effects Space Shuttle Main Engine Speckle Patterns Strain Gages Numerical Control Plastic Deformation Laser Applications Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
