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A new algorithm for precision laser triangulation measurement

SUN Junli,ZHAO Hui,TAO Wei(Department of Instrumentation of Shanghai Jiaotong University,Shanghai,200030,China)  
The accuracy of laser triangulation measurement system with CCD as detector mainly depends on the location of the image-spot on the surface of CCD.This paper puts forth a novel method for locating the image-spot.All nodes within a certain range near the image-spot are adopted to interpolate respectively and assigned with different weight separately to carry out the weighted average so that the exact position of the image-spot will be gained finally.This method takes full advantage of the multiple messages near the laser-spot so that the influence from the single light-spot to the precision of location can be avoided,and the precision and stability of location are enhanced notably.As is proved by the experiment,the precision of location can be up to 1/10 pixel.
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