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How to do material analysis with FDC1004

Fingal
Prodigy 20 points
Other Parts Discussed in Thread: FDC1004

The file FDC1004: Basics of Capacitive Sensing and Applications mention that FDC1004 can do  material analysis,I want to know if there is anything to reference?

( For material analysis, the capacitance between the plates will change depending on the difference of dielectric constant from material to material.
The high resolution from the FDC1004 allows a sensitivity range that can detect very small changes in dielectric. )

  • 0
    TI__Expert 7400 points

    Hi Fingal:

    I will need to clarify that it is not exactly material analysis but detection of an intended material. With this in mind, the sensor setup will be a parallel plate configuration so that the material you are detecting would be in between the plates. The capacitance will change based on the parallel plate capacitor formula. Some examples for this application would include paper stack height sensing (determining how many pieces of paper are between the plates), presence of currency, etc...

    Actual material analysis is not possible with capacitive sensing because the material cannot be determine since capacitance will change based on size of the target, location of the target relative to the sensor, and dielectric constant of the material. If two materials have very similar dielectric constants, is the same size and placed in the same location, the capacitance change will be very minimal and most likely not enough for the FDC to detect.

    Thanks

    -David Wang

    Capacitive Sensing Applications