Laser strain extensometer for material testing
US4869110A · kind A · utility
11Cited by
17References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 16, 1988 |
| Grant date | Sep 26, 1989 |
| Priority date | — |
| Expiry date | Jun 16, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B11/16
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A non-contact, laser strain extensometer for use in materials testing utilizes a revolving laser beam to measure the separation of benchmarks placed on the specimen to be tested. The reflection of the laser beam from the benchmarks is focused on a photosensor to generate electronic pulses. The time duration between these pulses can be precisely measured using electronic counters. This time duration correlates with the distance separating the benchmarks. The revolving beam can be generated either by rotating polygonal mirror or an oscillating mirror.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.