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Measuring non conductive coating with LDC1000?

Antti Kaaria
Prodigy 20 points

Hi.

Can the LDC1000 used as a coating tickness sensor for painted and varnished metal surfaces?

Let's say we have non coated  (5cmx 5cm) aluminium,steel etc. reference plate and two non conductive calibration plates for example 20um and 300um.

We calibrate the sensor and take measures on a painted/varnished surface to measure how thick the coating is.
Let's say we want accuracy of 10um.

Just curious can this be done with the LDC1000 and if it is what kind of inductor it needs?

Thank you

  • 0
    TI__Genius 9300 points

    If the calibration plates are conductive, and coatings will change the distance from the coil to conductive media, then yes.

    I'm not quite clear on the dimensions you gave - are those for the thickness of the coatings?

  • 0 in reply to Evgeny Fomin
    Prodigy 20 points

    We have a commercially available paint / varnish thickness gauge but it works only on metals which are ferromagnetic.

    I was just wondering is it possible to make a paint/varnish thickness gauge for other metals like aluminum, copper etc. with the LDC1000 and somekind of coil-probe.

    And I'm measuring the thickness of the coating. They can vary as little as 1 - 10micro-meters.

    Those calibration sheets are made of plastic.

    Thank you.

  • 0 in reply to Antti Kaaria
    TI__Genius 9300 points

    Hello,

    So, let's see if I got it right:

    you have metal surfaces that you cover with paint, and want to know the thickness of paint.

    If paint is not conductive, then yes, LDC will be able to measure its thickness.