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Original question:

tidud25a problem regarding LC sensor

tidud25a problem regarding LC sensor

Jeff Yu
Expert 2110 points
Other Parts Discussed in Thread: TIDA-01228

HI Milen,

I have investigated the solution of the tidud25a, actually it can works in 2 LC situtaion

and we test it is ok that the gap is 4~4.5mm(the distance between inductor and the disc).

However, we now want to increase the gap(hoefully to 6mm or more) as in real application the distance is normally 5-7mm.

We have try the following way but with no success:

1) change the capacitor value

2) change the inductor value

3) change different type on inductor

Do you have any idea of how to achieve it?

Thanks

Jeff

  • 0
    TI__Intellectual 1825 points

    Jeff,

    I’m really happy to read that you finally have your solution running and the distance of 4 to 4.5 mm is what I achieved as well and documented in the TIDA-01228. So you confirm my findings, which is good!

    Now, increasing the gap to 6 or 7 mm is really a stretch and I’m not sure if that is possible (depends on your application constraints). So I can only give you a few hints to consider:

    1. Material of the disc:
      1. what do you use now
      2. are you able to change that to something like stainless steel (or similar)

    2. Electromagnetic field (Eddy currents topic in Wikipedia.org)
      1. increase the time to detect a change in the oscillation (but this will limit the max. turning rate)
      2. Try to measure also the oscillation period change in addition to amplitude change (which we use now)
    3. test with modified inductors and capacitor values
    4. position of the inductors above the disc (also depends on the inductor form) 
    5. Test inductors with a modified body (longer or wider or both)

     I hope this helps.

     Regards,

    Milen

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