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none of which will pick up from a meter away.Put a blob of (white) paint on it and use a reflective photo detector,
Put a hole in it and use a direct photo detector,
Place a magnet on it and use a hall effect sensor.
Mike.
Hi,
Anyone know of a method of measuring a disc (car wheel type) using any electonic non contact method? need to be able to measure from about 1m distance with good accuracy speeds between 60-120rpm with a narrow pickup point ideally (8mm approx)
Thanks
Steve
Ah, I read the 1M distance as the smallest distance the wheel would move. Having reread it, I think you are correct. Maybe the OP should describe the setup so we have a better idea of the limitations.
Mike.