Photodetector array based optical measurement systems

Details Photodetector array based optical measurement systems Photodetector array based optical measurement systems

G - Physics

06

K

354/57

G06K 9/82 (2006.01) B07C 5/10 (2006.01) G01B 11/02 (2006.01) G06K 9/62 (2006.01)

Patent

CA 1166750

ABSTRACT OF THE DISCLOSURE A method and apparatus are provided for analyzing a light pattern produced on a photodetector array wherein a signal from the array is filtered by a low pass filter and then differentiated by at least one differentiator to obtain the first or second derivative of a point or points in the pattern. A zero crossing detector detects the point of zero crossing in the differen- tiated signal and a timer times this point to obtain the position of the point(s) in the pattern. This technique can be used with back-lit illumina- tion of edge images as well as with diffraction fringes and triangulation spots, among other uses. Further techniques using photodetector arrays are also disclosed.

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