Coating Thickness Gages: Calibration and Meas. Uncertainty
Coating Thickness Gages: Calibration and Meas. Uncertainty
James M. Ingram
There are many manufacturing processes that require the measurement of coatings. In the past the coating thickness gages were checked in the field with some sort of thin film placed on the bare metal or with a plated square of steel from the National Institute of Standards and Technology. These uncertainty requirements, along with more and more quality system demands, mean the gages are showing up at the metrology lab for calibration. This paper covers coating thickness gages based on both magnetic and eddy current measurement techniques. The basic design and calibration requirements are discussed along with a report of repeatability studies and the main contributions to measurement uncertainty.
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