Synchronous sampling circuit increases signal-to-noise ratio of measurements of chopped signal of known phase and frequency in presence of low-frequency or dc background noise. Used with linear array of photoelectric sensors for locating edge of metal plate. Multiplexing circuit cycles through 16 light-emitting-diode/photodiode pairs, under computer control. Synchronized with multiplexer so edge detector makes one background-subtracted signal measurement per emitter/detector pair in turn.


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    Title :

    Synchronous Photodiode-Signal Sampler


    Contributors:

    Published in:

    Publication date :

    1988-06-01



    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English




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