Electronic light beam tester

摘要

The invention concerns an opto-electrical device for measuring the orientation and the characteristic luminous intensities of light beams. The device is essentially characterized by containing at least: a screen on which photo-electric transducers are situated, a positioning device for the screen according to a reference direction, amplifiers and voltage dividers which give signals proportional to the characteristic luminous intensities sensed by the transducers and comparators for comparing the ratios between the voltage and between the maxima of sub-sets of voltages.