Optical sensor for object position and-or contour - guides object reflected light from source to opto-electronic receiver via optical system

摘要

The light beams from a light source (LQ) are reflected from the sensed object (OB) and are fed to an opto-electronic receiver (A) via an optical system (AX, L). The strength of the light beams is independent of the object position and contour. The object related information is obtained directionally selectively from the impingement angle of the beams at the receiver. The optical system pref. contains a conical axicon, whose surfaces point towards the examined object. The opto-electronic receiver may contain two photodetector in tandem in the direction of the light beams, with a beam guide plate in between. It may have a photoconductive stage index fibre, with transite time differences caused by the beam impingement angles. ADVANTAGE - Reliable evaluation of detected light flux.