.A method for calculating the center position of collimated light[J].Optoelectronics Letters,2008,4(2):155-158 A method for calculating the center position of collimated light WU Guo-jun WU Ling-ling CANG Yu-ping HE Jun-hua DONG Wei-bin CHEN Liang-yi Xi＇an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi ＇an 710119, China Abstract:       It is a key problem to accurately calculate beam spots'center of measuring the warp by using a collimated laser.A new method,namedd ouble geometrical center method(DGCM),is put forward for the first time.In this method,a plane wave perpendicularly irradiates an aperture stop,and a charge couple device(CCD) is employed to receive the diffraction-beam spots,then the geometrical centers of the first and the second diffraction-beam spots are calculated respectively,and their mean value is regarded as the center of datum beam.In face of such adverse instances as laser intension distributing defectively,part of the image being saturated.this method can still work well.What's mole,this method can detect whether an unacceptable error exits in the courses of image receiving,processing and calculating.The experimental results indicate the precision of this method is high. Hits: 3419 Download times: 192 View Full Text    Download reader