Leica Geosystems Ag

Marcel Buerki

Jürg Hinderling

Paul Benz

Juerg Hinderling

Markus Geser

Roland Graf

Markus Hammerer

J&uuml;rg Hinderling

Gerhard Bayer

Günther Hanns

Bruno Pfiffner

G&uuml;nther Hanns

Marco Landert

A device for measuring the distances (d) to far-off objects () and close objects by emitting modulated laser beams () that are reflected on the objects. The device includes an objective (), structure(s) () for selecting beams, and a receiver (). Beams are bundled by the objective, the beams not only containing the laser beams () reflected on the objects but also background beams (). The beams in an associated cross-sectional region () of the bundle are selected from a bundle of beams by the selection structure(s) (). The cross-sectional region includes a first section () and at least one second section (), laser beams () reflected by a far-off object being associated with the first section (), and laser beams () reflected by a close object () being associated with the at least second section ().

Device for measuring the distance to far-off objects and close objects

In geodetic measuring systems and measuring devices ( ) there exists a need to find and detect, rapidly and automatically, marker points to be measured that are provided with a marker (retro reflector) ( ). For the rapid detection, identification and determination of the horizontal angles of such a marker, even at greater distances, electromagnetic radiation in the form of a vertical fan ( ) is transmitted by a transmitter unit ( ) whose radiation is received, after reflection from the marker, by a receiving unit with a view field in the form of a vertical fan. By analyzing the signal strength and the apparent object size, a plausibility test and a reliable suppression of foreign or interference markers can be achieved. Such a marker searching device is marked by a selective analysis of specific characteristics of a marker detected. On the basis of the plausibility test, a rapid, certain and robust location of markers is possible.

Process and device for the automatic location of reference markers

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Au, Switzerland

Marcel Buerki