Electronic Interface with Vignetting Effect Reduction for a Nikon 6B/6D Autocollimator

GUILLERMO BERGUES; LUIS CANALI; CLEMAR SCHURRER; ANA GEORGINA FLESIA

IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

Lugar: New York; Año: 2015 vol. 64 p. 3500 - 3509

0018-9456

In this paper we present an electronic interfacecreated for the Nikon 6B/6D visual autocollimator which allowsfor an increase in the final resolution of measurements and areduction of the vignetting and distortion effects produced bythis optical instrument?s lenses. The electronic interface consistsof a Basler ACE HD camera and its positioning devices, and acomputer with a sub-pixel digital image processing package. Thelatter includes two main procedures: one for scale calibrationand the other for determining the position of crosshair lines.Both procedures work at sub-pixel level. The feasibility of themeasurement method was verified. The resolution obtained forthe measurement of angular displacements is about 0.019 secondsof arc, 25 times better than the one registered by the originalvisual system. Its overall performance was compared against anelectronic level with internationally traceable certification.