Patent ID: 7582855
Filing Date: 2009-09-01
Classification: A61C,G01B,G02B

Abstract:
1. A scanning system for an object comprising: a light source for emitting illuminating light along an illuminating light path, an aperture array positioned between the light source and the object, imaging optics positioned between the aperture array and the object for focusing the illuminating light onto the object, means positioned between the aperture array and the object for changing a length of an optical path between the aperture array and the object, an image detector for detecting backscattered light from a point on the object that passes back through said imaging optics along an observed beam path, said image detector comprising two sensor elements for detecting backscattered light from the object point, and means for adjusting an accumulation of charges in the two sensor elements from intensity of light in the observed beam path during an exposure period (T) so that a correlation with the length of the optical path of an image plane from the imaging optics is created to enable reconstruction of an altitude coordinate (zs) of the object from a distribution of levels of intensity acquired from the two sensor elements during the exposure period (T), said means altering sensitivity of said two sensor elements and/or translucence in the observed beam path between said imaging optics and said image detector.