Laser alignment system with modulated field
US4756617A · kind A · utility
34Cited by
16References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 27, 1987 |
| Grant date | Jul 12, 1988 |
| Priority date | — |
| Expiry date | Jan 27, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C15/004
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A laser alignment system includes a transmitter and one or more receivers. The transmitter produces an alignment field by projecting laser energy in a non-planar reference cone, and the receivers locate this reference cone with photodetectors. The laser energy in the alignment field is modulated at 8 kHz and the signals produced by the photodetectors are filtered and amplified to increase the range of the system. Each receiver operates a display which indicates when it is aligned in the reference cone, and it produces an out-of-level indication when the transmitter is not properly aligned.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.