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LDC1314: Target substrate tilt vs accuracy for LDC1314

yoshiki hasebe
Mastermind 6385 points
Part Number: LDC1314

Dear Sirs,

My customer asked us about Target substrate tilt vs accuracy for LDC1314.

As a condition of their use, the substrate on which the target is mounted may be inclined by about 0.3 mm with respect to the sensor substrate.
For this reason, they think that they have to take some measures.

Therefore, they asked us for data on the accuracy (tilt vs. accuracy) when the substrate on which the target was mounted was tilted.
Please let us know if you have the data for the slope vs. accuracy.

Also, please tell us if you have any advice or measures to suppress the deterioration of the accuracy of the angle to the tilt of the substrate on which the target is mounted.

Best Regards,

Y.Hasebe

  • 0
    TI__Genius 17440 points
    Hello,

    The tilt between the sensor coil and the target will absolutely affect the measurements. We do not have data to share for how angle can affect measurements because it is heavily dependent on the distance between the target and the sensor, the target's size, and the target's shape.

    Though tilt will change the output codes from the LDC1314, the exact values of the output codes do not generally matter. The change in output codes as the target moves is more important. If the target has a constant tilt the system should be able to function properly. The potential problem is if the target tilt changes while the LDC1314 is making measurements, which could be misinterpreted as the target moving closer to or further from the sensor coil. For this reason, it's very important to keep the target mechanically stable.

    Best Regards,
  • 0 in reply to Kristin Jones93
    Mastermind 6385 points

    Hello Kristin-san,

    Thank you for your reply.

    I understand that it is very important to keep the target mechanically stable.
    However, there is a limit to keeping mechanical stability, so I would like to know if there is any other way.

    Do you have a way to reduce the level of misreads when the target approaches or moves away from the sensor coil?

    Best Regards,

    Y.Hasebe

  • 0 in reply to yoshiki hasebe
    TI__Genius 17440 points

    Hello Hasebe-san,

    Unfortunately the only way to compensate for this is to control it mechanically. The LDC1314 can only measure when the sensor frequency has shifted. It cannot tell what caused the shift, whether it was due to planned target movement or unintended target tilt.

    It's possible that the 0.3mm tilt may cause a much smaller response than the intended target movement. I suggest measuring the shift in output code due to both types of movements. If the response due to tilt is 10x smaller than the response due to intended movement, then the tilt can be absorbed into the noise floor.


    Best Regards,

  • 0 in reply to Kristin Jones93
    Mastermind 6385 points

    Hello Kristin-san,

    Thank you for your reply.

     I want to know a little more about both types of movements in your answer.

    Then I would like to contact you by email.

    So please tell me your email address.

    Best Regards,

    Y.Hasebe

  • 0 in reply to yoshiki hasebe
    TI__Genius 17440 points

    Hello Hasebe-san,

    Please feel free to add me as a friend on E2E so we may communicate via E2E direct message.

    Best Regards,

  • 0 in reply to Kristin Jones93
    Mastermind 6385 points
    Hello Kristin-san,

    Thank you for your reply.
    I understand it.

    Best Regards,
    Y.Hasebe