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Using LDC1101 to measure gap in metal

Paul Goedeke
Mastermind 30600 points
Other Parts Discussed in Thread: LDC1101

Hello,

I'm working with a design using the LDC1101 to replace an existing mechanical potentiometer. It could be done by using a tapered piece of metal over the coil. However, would this technology work if the coil was placed underneath a tapered void in a sheet of metal? In the picture below, metal is grey, white is air, and the red is the pick-up coil. This slot would be moved along the x-axis of this image and at a constant height above the coil.

Would there be any accuracy issues compared to having a tapered metal target? Does this look like a feasible idea?

Thank you very much for your help! I really appreciate your time.

Paul

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    TI__Genius 14270 points
    Hi Paul.

    The approach you are proposing is feasible, but you will need to ensure that the alignment in the X/Y direction is good. It is better to have a "positive" target (a metal target ) than a "negative" target (the void in the metal) , because the eddy currents induced mirror the current path of the sensor.

    Regards,

    Chris O