defect whereas the triangulation measurement indicates the presence of a defect by the sharp narrow spike in the corrected signal shown in fig9 the sharp spike from the coating defect is easily resolved another example showing the detection of uniformities is shown in fig1 in this case synchronous data collection was performed with a coated cylinder rotating at 59 rpm the lhs figure shows a profile of the coating relative to the cylinder surface the non uniformity in the coating thickness is evident but the surface is relatively smooth the rhs figure shows the same coating subjected to chattering conditions through the interaction of a doctor blade and coating comparing the two cases clearly shows the sensor system 39 s ability to capture degradation in the surface quality of the coating detecting chattering events is critical on the yankee process to perform corrective maintenance that minimizes the impact on product quality and asset protection moisture which may affect the differential calculation can also be accounted for specifically moisture can be calculated from the dielectric constant derived from a capacitance measurement this data can be utilized to decide whether any change in thickness is a result of moisture or the lack of a coating another way of looking at the.