Steel surface lubricating oil coated Film thickness measurement

We use the MProbe Vis-Micro microscopic Film Thickness Gauge to measure the thickness of the lubricating oil film on the steel surface. The diameter of the measurement spot is 40um, and three points are selected for measurement (see Figure 1). The dissipation model of the lubricant uses the Cauchy approximate model, and the refraction The rate is about 1.43. Steel surfaces have a certain roughness, which causes light to scatter. Surface roughness is also measured.

　　The measurement results are as follows:

Figure 2. Measured reflectance spectra of 3 points

Figure 3. Curve fitting for measurement point 1

Figure 4. Curve fitting for measurement point 2

Figure 5. Curve fitting for measurement point 3