Leica Geosystems Ag

Bernhard G&auml;chter

Beat Aebischer

Urs Vokinger

Christian Betschon

Ernst Ramseier

Georg Orawez

Esther Rutishauser

In order to improve target illumination a light emitter comprises several partial light sources ( ), the partial beams ( ) of which are collected by means of a beam collector optic ( ) and directed to the aperture of a collimator ( ). The beam collector optic ( ) comprises two half-mirrored sheets ( ), which each direct two similarly polarized partial beams ( ) side by side onto a polarization cube ( ), where the pairs of partial beams which are polarized perpendicular and orthogonal to each other are overlaid.

Optical rangefinder

To measure the distance to targets, local maxima exceeding a threshold (&egr;) and being associated with a correlation function (f) are determined, the reference values of which are obtained from scalar products of a received signal (e), produced by reflections of an optical pulse by the targets, and number of comparison functions, copies of a reference function (r) which are shifted as a function of time, and the transit times of the reflections are derived from the time-related shifts of the corresponding comparison functions. By interpolation with respect to the time-related shifts or optimization thereof, for example by adjusting them so that the orthogonal distance of the received signal (e) from the vector space which is spanned by the corresponding comparison functions is a minimum, the transit times can be determined even more accurately.

Method for measuring the distance to at least one target

Growing community of inventors

Balgach, Switzerland

Bernhard Gächter

Growing community of inventors

Balgach, Switzerland

Bernhard G&auml;chter

Bernhard Gächter