Hand-held laser distance measuring device with a pulse reflection mixing method
US7714990B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 2008 |
| Grant date | May 11, 2010 |
| Priority date | — |
| Expiry date | Jan 16, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S17/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A hand-held pulse laser distance measuring device and a pulse reflection mixing method both having an algorithm which controls a microcontroller and which serves to calculate the distance to a measurement object by at least two different time differences τ11, τ12 between a measurement pulse and a reference pulse with a pulse width Δt, which time differences τ11, τ12 are measured with a pulse repetition frequency f1, f2, respectively, wherein a selection module is provided which selects at least the first pulse repetition frequency f1 from at least a first frequency set {f}1 with at least one other pulse repetition frequency f1i in such a way that the condition |τ11·f1i|>A >2·|Δt11·f1i| is satisfied with a pre-selected lower limit A, a relative time difference |τ1i·f1i| and a relative pulse width |Δtλ·f1i|.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.