Precision Optical Emitters
Original Publication Date: 1981-Apr-01
Included in the Prior Art Database: 2005-Feb-11
Small emitter distances are detected without having close mechanical distances normally associated with a grid and an aperture. The optical emitters, such as that shown in Fig. 1, use a light source 1, such as a light-emitting diode (LED), a collimating lens 2, an optical grid 3, a 90 degrees prism 4, and a photodetector 5.