Leica Geosystems Ag

Logitech Europe S.a.

Yves Salvade

Marcel Rohner

Peter Sheehan

Thomas Jensen

Olivier Theytaz

Neil O'Connell

Olivier Mathis

Sébastien Le Floch

Dennis O'Keeffe

Sebastien Le Floch

A method for speckle mitigation in an interferometric distance meter comprises the steps of transmitting optical radiation with at least one wavelength &#x3bb; to a target to be surveyed, receiving a portion of the optical radiation scattered back by the target in an optical axis (OA), wherein the optical radiation forms a speckle field, converting the received optical radiation into at least one received signal, determining a true distance to the target from the received signal by absolute or incremental interferometric distance measurements. In the method the true pointing direction relative to the optical axis (OA) is determined, wherein the distance error due to speckle effects is corrected.

Method for speckle mitigation in an interferometric distance meter by determining a pointing direction

In a method for generating a synthetic wavelength, particularly for an interferometric distance measuring setup, with a primary laser source defining a primary frequency &#x3c5;and at least a first sideband frequency &#x3c5;of the primary frequency &#x3c5;, laser radiation with the first sideband frequency &#x3c5;and a corresponding first wavelength is provided wherein the first sideband frequency &#x3c5;is continuously shifted, particularly by modulating the primary laser source. The synthetic wavelength is generated by combining the first wavelength and a second wavelength which is defined by the primary laser source, particularly by superposition.

Method and device for generating a synthetic wavelength

A housing for a control device includes an enclosed cavity configured to secure an optical detection system, including a light source and a sensor, and a face of the enclosed cavity configured to include a window to allow light from the light source to scatter light off of a surface and configured to allow reception of the scattered light on the sensor. In this configuration the housing is structured to prevent exposure of the optical detection system to external elements such as the surface. Also disclosed is a homodyning system for use with a coherent light source optical pointing device.

Continuous base beneath optical sensor and optical homodyning system

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St. Imier, Switzerland

Yves Salvade