Patent ID: 6449036
Filing Date: 2002-09-10
Classification: G01B,G01N,G01S,G02B

Abstract:
A device for inspecting a surface of an object to determine surface characteristics of the object, said device comprising:a scanning device, and an optical sensor unit comprising: a sending module for emitting light to the scanning device, a receiving module for receiving light incident from the scanning device, and an optical deflecting element that is operable to split light incident from the scanning device into a first beam path and a second beam path, said first beam path being different than said second beam path, said first beam path being defined by a first spatially limited part of the incident light and said second beam path being defined by a second spatially limited part of the incident light, and where the first spatially limited part has a cross sectional area that is smaller than a cross sectional area of the second spatially limited part, wherein the scanning device includes:a light deflecting element, said light deflecting element having a time-dependent deflection angle, and a concave mirror having a focal point and an axis of symmetry (7), wherein said light deflecting element is located in said focal point so that light emitted from the sensor unit can be guided into the sensor unit under a constant angle relative to the symmetry axis of the concave mirror along a scanning line over the object and so that light diffusely scattered from the object emanating from the scanning device can be guided into the sensor unit along a path identical to the emitted light and wherein the concave mirror is disposed relative to the object surface and the receiving module such that the surface can be telecentrically projected into the receiving module and the light deflecting element acts as an aperture diaphragm, said receiving module further comprising at least one light receiver with a special filter or a diaphragm designed and positioned in a manner that directly diffusely scattered light is blanked out for said at least one light receiver, in order to detect tracheid scattered light.