A system for measuring a thickness of a coating arranged on an anode substrate includes an optical measurement system configured to transmit a light signal having a known first polarization toward the anode substrate through the coating such that the light signal is reflected from the surface of the anode substrate, a detection module positioned to receive the reflected light signal and configured to determine a second polarization of the reflected light signal that is different from the first polarization and measure a polarization difference between the first polarization and the second polarization, and a measurement module configured to receive the measured polarization difference, calculate the thickness of the coating based on the measured polarization difference, and generate an output based on the calculated thickness.