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FDC1004EVM: Sensing through conveyor belt

tom roberts
Prodigy 20 points
Part Number: FDC1004EVM
Other Parts Discussed in Thread: FDC1004

We want to mount a FDC1004 PCB under a conveyor looking upward through a 2mm thick plastic conveyor belt. The PCB would be potted in a ~2mm layer of epoxy resin, and we'd use active shielding to address the capacitive effect of the stainless steel below. Will having to look though the epoxy and plastic significantly affect measurements though attenuation, capacitive effect, or any other means?

  • +1
    TI__Mastermind 40295 points

    Tom,

    The Epoxy won't be a problem, and the conveyor belt material  in and of itself probably won't present a problem,
    But the movement of the conveyor belt, and any associated change in its thickness or vertical position may be contribute fluctuations in the capacitance measurements (aka "noise").

    Regards,
    John