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How to improve the measurement change?

XUNYAN MA
Prodigy 20 points
Part Number: LDC1612EVM

I have a ldc1612evm development board, a coil of diameter 20mm, but I use them to measure the deformation of 1mm at the 15mm distance, and the inductance return is only less than the change of 0.001uH. How to increase it. My hope is to change 0.01uH.

  • 0
    TI__Mastermind 23810 points
    You can increase the response in the following ways:

    - Make sure that the target is at least as large as the sensor coils.
    - Increase the diameter of the sensor coil (make sure the target is still at least as large as the sensor coil)
    - Reduce the distance
    - Increase the deformation
    - Double check the skin depth of the target material you are using (you can use the skin depth tab on the LDC Tools calculator). If the material is too thin and not as conductive, then either increasing the thickness of the target or changing the material composition will help.

    These are the only ways to improve the response. Mechanical design is very important for these devices. You can use the LDC Tools calculator to estimate the inductance change before you even build the sensor + target.
  • 0 in reply to Clancy Soehren
    Prodigy 20 points

    Thank you for your reply. The target is immutable (it may be iron, but it is thick enough, big enough), I wonder if I can increase its response by just changing the coil. unfortunately the coil size is limited (maximum 20mm).Can you tell me more about this?

  • 0 in reply to XUNYAN MA
    TI__Mastermind 23810 points
    Unfortunately, I already described all of the ways to increase the response. There is no more you can do without changing part of the mechanical design.