Patent ID: 6290135
Filing Date: 2001-09-18
Classification: G06K

Abstract:
A method of scanning an item in a scan volume, comprising the steps ofgenerating first and second light beams along first and second offset outgoing beam paths;locating a scanning mechanism in the outgoing beam paths;scanning the first and second light beams with the scanning mechanism toward a target;collecting return light from the target onto a first detector and a second detector;arranging the first detector and the second detector offset to collect primarily return signal originating from the first light beam onto the first detector and collect primarily return signal originating from the second light beam onto the second detector;focusing the first light beam to a near field waist location;focusing the second light beam to a far field waist location;adjusting processing of the return signal from the first detector to enhance processing of near field signals;adjusting processing of the return signal from the second detector to enhance processing of far field signals.