Optical surface topography mapping system
US4070683A · kind A · utility
23Cited by
4References
5Claims
0Family size
Inventors
Key dates
| Filing date | Mar 4, 1976 |
| Grant date | Jan 24, 1978 |
| Priority date | — |
| Expiry date | Mar 4, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C11/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A first laser beam is reflected from the front and rear surfaces of a partially silvered glass slab generating a diverging set of interference fringes which are collimated by a positive lens. A second set of fringes is generated by a second laser beam and second partially silvered glass slab and is positioned to project through the first slab and is collimated by the same positive lens. The second pattern is aligned coaxially and mutually perpendicular to the first pattern creating a rectangular parallopiped grid pattern projected upon an observed object.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.