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Identifying leads of a quadrature photodiode

grozema

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Aug 21, 2013
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Hey Guys, I have a quick question for anyone. Currently I'm working on converting a discarded CD-ROM drive into an optical profilometer. I've built the necessary circuitry to amplify the signals and sum the quadrants of the photodiode but I can't find anything to help me identify the leads for the A,B,C, and D quadrants of the detector. is there any way anyone could point me to something that helps identify these? if necessary I can post a picture of the photodiode to help with identification. thanks!
 



BShanahan14rulz

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heh, how good are you with macro photography? :can: All I can think of, maybe there are bond wires sticking out of logical places on the detector and going to visible ends of pins in the package.
 

grozema

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I have a microscope at my disposal so a picture wont be a problem at all. however, it is being calibrated at the moment so maybe in an hour or two I can get a picture up.
 

ARG

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Yeah, unless you can find the datasheet for the diode you'll have to eye ball it and see what's going on.
 




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