METHOD OF DETERMINING COATING THICKNESS DURING PLASMA-ELECTROLYTIC OXIDATION Russian patent published in 2011 - IPC G01B11/06 

FIELD: physics.

SUBSTANCE: method of determining coating thickness during plasma-electrolytic oxidation involves measuring radiation energy during the coating process. Radiation of the component in the 380…740 nm spectral range is focused on a light-sensitive matrix and then picked up after a time interval Δt_n with delay of 1/2…1/2000 s. The ratio of the total area of sections A_n illuminated by images of microdischarges 30…99% greater than a threshold value to the total area of the image of the component A₀ is determined and the relationship is time integrated. Coating thickness h is determined using the formula where k is an empirical coefficient of proportionality which depends on the nature of the processed material and composition of the electrolyte, n is the number of the time interval, N is the number of intervals in a period of time T.

EFFECT: possibility of determining coating thickness during plasma-electrolyte oxidation owing to use of an information-bearing radiation band lying in the visible range, and reduction of power consumption by avoiding overexposure.

8 dwg, 1 ex, 1 tbl