Figure 4
From: Interferometric measurements of refractive index and dispersion at high pressure
Analysis of the interference ring pattern obtained from the empty DAC (\(t_{s}=\) 18.41 µm and \(k_{L}=\) 69.23) with a 532 nm laser. (a) The intensity minima (red circle) are determined with a local Gaussian fitting of radial intensity profiles and fitted with a multiple-circle fitting method (blue dotted line) to determine the center and the radii of each ring. (b) The experimental (black dotted) and corrected (red) radial intensity profiles are compared with a calculated one (blue). Note that we overexpose the pattern in order to accentuate the locations of the minima and the amplitude of the calculated profile is properly adjusted to improve the visual comparison with the experimental profile. (c) Third-order polynomial fitting (red) between the experimental and calculated ring radii (black circle) with an identity line (gray dash).
