Patent ID: 7283223
Filing Date: 2007-10-16
Classification: G01N

Abstract:
1. An illumination apparatus comprising: a light source; an optical system, having an axis, at least partially situated between the light source and a target; and a detector situated on the axis and proximate to the target; and wherein: the target moves on axis or off axis; the light source provides a light beam that is moveable to illuminate the target on axis or off axis; light from the light beam is mapped to a first position on the detector when the light source is on axis; light from the light beam is mapped to a second position on the detector when the light source is off axis; the second position is equivalent to the first position; the illumination apparatus further comprises: a mechanism connected to the light source to provide various positions of the light source that moves the light beam; and a processor connected to the detector and the mechanism.