Hand-held laser distance measuring device with a pulse reflection mixing method
US7940378B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 15, 2008 |
| Grant date | May 10, 2011 |
| Priority date | — |
| Expiry date | Dec 20, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S17/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A hand-held laser distance measuring device (1) with pulse reflection mixing includes a control device (2) for calculating the distance (D) to a measurement object (3) over at least one determinable periodic, with a pulse repetition frequency (f), time difference (τ) between a measurement pulse (4) reflected at the measurement object (3) and a reference pulse (6) of an optically emitted transmitting pulse (7) traveling over a reference distance (5) within the device, a local oscillator (8) for generating the transmitting pulse (7) at the pulse repetition frequency (f), at least one delay circuit (9a, 9b) which can be controlled by the control device (2), is arranged between the local oscillator (8) and a light detector (10) and/or a light transmitter (12), and generates a delay between the scanning pulses (11) and the transmitting pulses (7) in order to scan the measurement pulse (4) and the reference pulse (6).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.