Surveying instrument
US4346989A · kind A · utility
33Cited by
2References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 30, 1979 |
| Grant date | Aug 31, 1982 |
| Priority date | — |
| Expiry date | Aug 30, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C3/30
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A tacheometer includes a distance measuring module whose output indicates the distance to a target by a phase shift in an output signal relative to a reference signal. An angle measuring module has an output that indicates angular displacement by a phase shift in another output signal relative to a different reference signal. A single phase comparison module alternately measures both phase shifts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.