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Original question:

Detect Fog or Mist

Mist and Deposition rates using FDC

Brad Johnson2
Prodigy 55 points
Other Parts Discussed in Thread: FDC1004, HDC2022

I have a related question to one seen on the forums from 4 years ago.  We would like to order FDC sensors for capacitance sensing, and set them up in a way so that we can measure mist deposition rates at various locations within an enclosed space.  We understand we'd need to set up a "reference" sensor in a dry space, and then be logging moisture levels of the different sensors relative to that control/reference sensor.  High-resolution is not necessary here, however we are dealing with extremely small water droplets (~10 microns in diameter) that will be accumulating on a surface over time.  Any insight as to what FDC sensors would be best suited for this process, and how we'd go about setting it up for the best possible results?  Thank you very much in advance.

  • 0
    TI__Expert 3435 points

    Hi,

    Thank you for contacting us regarding your application.

    I recommend FDC1004 device based on the provided information. Please refer to the Out-of-Phase Liquid Level Technique for liquid level sensing using FDC1004 device. Even though it is addressing liquid level sensing application here, it is useful in designing for your application. Detecting droplets could be difficult as the increase in capacitance will be minimal. The physical encloser should be designed such that the droplets should only fall on the actual sensor but not on the reference sensor. Sensor size should be increased to read higher capacitance with small water droplets. I would recommend testing your setup with an EVM to play with gain and other settings to see if the results are satisfactory. Please refer to Common Inductive and Capacitive Sensing Applications to understand the fundamentals.

    Please refer to the Humidity and temperature sensor HDC2010 page as well. This could be the right fit for your application. We also have a new device coming out soon HDC2022, which has a hydrophobic filter on the sensor. 

    Regards

    Sharath.