Abstract

A laser radar is provided that comprises a laser beam source arranged to generate a laser beam, means for changing an elevation angle of a beam axis of the beam, means for controllably adjusting anisotropy of a cross-section of the beam and a controller configured to control adjustment of a degree of anisotropy of the beam in correspondence with changes of the elevation angle. The laser radar may be used for example with the beam directed downward at grazing angles to a surface, the controller being configured to increase the degree of anisotropy with increasing angle to a direction of the surface. In this case, elevation angle corresponds to distance to the target. By adjusting anisotropy with distance, higher sensitivity can be realized at long distance and less scans are required to cover shorter distances. A beam with a diverging profile may be used, which diverges anisotropically, with selectable divergence in the elevation direction and constant divergence perpendicularly to the elevation direction. This may be realized using movable or rotatable cylindrical lenses, reflectors or refracting optical elements.

Claims

Description

Topics

Download Full PDF Version (Non-Commercial Use)

Patent Citations (6)

    Publication numberPublication dateAssigneeTitle
    DE-10124433-A1November 21, 2002Bosch Gmbh RobertDevice for optical distance measurement has components that allow easy variation of the beam path direction and divergence to match the target type and distance
    DE-102006008139-A1August 23, 2007Adc Automotive Distance Control Systems GmbhSensor for environment monitoring in motor vehicle, comprises dynamic detection area, which is controlled depending on situation, where motor vehicle has device for speed and heading angle regulation
    DE-4402642-A1August 10, 1995Leuze Electronic Gmbh & Co, Schwarte Rudolf Prof Dr IngOpto-electronic arrangement locating obstacles within defined area
    EP-0840140-A1May 06, 1998Honda Giken Kogyo Kabushiki KaishaAntennenvorrichtung
    US-2007216878-A1September 20, 2007Omron CorporationDistance measuring device and laser beam projector therefor
    US-2007295393-A1December 27, 2007Akeena Solar, Inc.Mounting system for a solar panel

NO-Patent Citations (2)

    Title
    BISSON S E ET AL: "NARROW-BAND, NARROW-FIELD-OF-VIEW RAMAN LIDAR WITH COMBINED DAY AND NIGHT CAPABILITY FOR TROPOSPHERIC WATER-VAPOR PROFILE MEASUREMENTS" APPLIED OPTICS, OPTICAL SOCIETY OF AMERICA, US LNKD- DOI:10.1364/AO.38.001841, vol. 38, no. 9, 20 March 1999 (1999-03-20) , pages 1841-1849, XP000828596 ISSN: 0003-6935
    S.E. BISSON: 'Narrow-band, narrow-field-of-view Raman lidar with combined day and night capability for tropospheric water-vapor profile measurements', 1999, OPTICAL SOCIETY OF AMERICA

Cited By (0)

    Publication numberPublication dateAssigneeTitle