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LDC1000 high speed proximity detection application

Rob Price
Intellectual 310 points

Hi

I am considering using the LDC1000-Q in a railway wheel sensor application as a proximity detector.

The distance from the sensor to the wheel would be up to 25mm (1 inch).

The cable length from the sensor to the LDC1000 would be up to 10m.  The cable has a mutual capacitance of 70pF / m and impedance of 100ohm @ 100Khz. The cable is screened.

The wheel will be traveling up to 200km/hr and the sensor coil could be up to 100mm in length and 50mm in diameter (design is not fixed).

Going to need to have a high sampling rate > 30k sps.

Is the LDC1000 suitable for this application ? I am concerned about the cable length and stability.

Any feedback on this would be greatly appreciated ?

Thanks in advance

Rob

  • 0
    TI__Genius 13650 points
    Hello Rob,
    the only automotive qualified device which we currently offer that supports the sample rate which you require is indeed the LDC1000-Q.
    I am concerned about the cable. Please refer to the Remote Coil Length tab on the LDC tools spreadsheet: www.ti.com/.../snoc028. While it is technically possible to use a 10m sensor cable if the sensor frequency is low enough, the sensor Q will be very low which would impact measurement performance.
    Is there any way to place an LDC close to the sensor?