Optical device for determining the location of a reflective target
US5771099A · kind A · utility
10Cited by
2References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 19, 1996 |
| Grant date | Jun 23, 1998 |
| Priority date | — |
| Expiry date | Dec 19, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C15/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to an optical device by means of which the direction of a graticule may be measured with high precision. To this end, the graticule is illuminated by a spotlight and the light reflecting from it collected by a theodolite telescope and a locating detector. To increase the range and to improve accuracy of measurement, use is made not of a conventional spherical metal graticule but a sphere of transparent material the refractive index n of which is greater than the square root of 2 and smaller than 2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.