Laser land-surveying apparatus with digital display
US4029415A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 3, 1975 |
| Grant date | Jun 14, 1977 |
| Priority date | — |
| Expiry date | Feb 3, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C15/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A land-surveying apparatus for use with a laser beam source to obtain grade and range distances has a grade pole with a laser beam detection unit slidably mounted thereon, electrical measuring means being connected between the grade pole and the detection unit to generate an electrical grade signal representative of the grade distance between a detector using an array of phototransistors and the base of the grade pole. A digital display unit receives the grade signal, processes it, and digitally, visibly displays the information contained in the signal. Electrical grade calculating circuitry is provided to process first and second grade signals containing the elevation of the upper and lower edges of the laser beam relative to the base of the pole and arithmetically process the signals to obtain the elevation of the laser beam center which is then displayed as the grade distance. Electrical range calculating circuitry is provided to selectively use information contained in the laser beam and generate a range output signal representing the range distance between the laser beam detector and the laser source, the range calculating circuitry delivering the range output signal to the di…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.