An optical sensor which can be used in conjunction with an automatic stripping apparatus. A plurality of sensing elements are placed in a predetermined geometrical relationship with respect to a plurality of nozzles which deliver paint stripping material. Each of the sensing elements comprises a lens system which optimizes inspection of the desired field of view while minimizing the effects of light from outside the desired field of view. The sensing elements produce optical signals which are converted into electrical signals by a plurality of optical detectors. The signal output of the plurality of detectors is analyzed using a programmable digital computer which is used to control a robotic positioning system.
R.J. Weniger;E.A. Franke;Glynn Bartlett