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Optical shaft encoder photodiode circuit

2015-02-04 17:52  
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Optical shaft encoder photodiode circuit
Light emitted from incandescent light bulb reaches the photodiode through the lens, cylindrical lens and the slot of chrome optical encoding disk. Coding plate engraves according to cyclic binary code. If it is corresponded to n-bit binary code, n photodiodes should be ranked in the optical narrow line behind the slot. 16-bit requires the width of optical slit of 20μm, so the good reliability can be ensured. Microampere meter reads about 0.1μA when there exists light. And it reads about 6~10μA when there is no light. 3DG5DX2 is the composite pipe, which has a rather greater magnification and emitter output. Two pieces of 3DK2 composite Schmitt trigger, whose function is to coin. When there exists light, the output is less than 0.5V. When there is no light, the output reaches +6V.