INTENSITY COMPENSATED SCANNING SYSTEM

摘要

An intensity compensated scanning system includes laser means (10) for providing a laser beam; scanner means (14) for sweeping the laser beam in an arcuate path across a surface (21) to be scanned; means (22) for sensing the return laser beam reflected from the surface to be scanned; means (38) for quantifying the decrease in the intensity of the return laser beam at the scan extremity portion relative to the intermediate scan portion; and means (30) responsive to the means for quantifying for varying the power to the laser means at the scan extremity portion relative to that at the intermediate scan portion for balancing the intensity of the return laser beam reflected from the surface to the means for sensing.