Optical monitoring apparatus
AssigneeErwin Sick GmbH Optik-Elektronik
InventorErwin Sick
Life of this patent
Estimating the term…
Abstract
Optical monitoring apparatus for detecting the angles at which light rays leave a material surface scanned by a light bead such as an incident laser beam includes a row of individual Fresnel lenses arranged edgewise directly adjacent each other to focus light leaving the surface onto respective arrays of photodetectors arranged in their focal planes. The outputs from the photodetectors are connected together by processing means to allow evaluation of their output signals. The row of Fresnel lenses may also be used for other optical monitoring purposes.
Claims7
Optical monitoring appratus for the separate detection of light rays which leave a surface scanned by a light beam at various angles in which there is provided, in the path of the light rays leaving the surface, a strip-like row of Fresnel lenses extending in the scanning direction, said strip like row comprising a series of individual Fresnel lenses arranged edge-wise directly adjacent one another with at least the adjacent edges of each neighbouring pair of Fresnel lenses being plane and their being further provided a respective group of a plurality of photodetectors arranged in the focal plane of each individual Fresnel lens and processing means for processing the electrical output signals from said photodetectors.
Dependencies are inferred from the claim text.