Fig. 2: Experimental and simulation contour plots at different oil/gas fractions.
From: Multiphase flow detection with photonic crystals and deep learning
a Examples of the random configurations of oil-filled holes in the photonic crystal block, with filling fractions (left to right): 0%, 40%, 70% to 100%. The remaining holes are filled with air. Green pixels represent oil-filled holes and red pixels represent air-filled holes. b Color contour plots from microwave transmission measurement on photonic crystal with oil-filling pattern corresponding to the configurations in a. The contour plots are shown for the range of incident angle 0–180° (x-axis) with a step size of 1°, and there are 201 discrete measurement frequencies along the y-axis from 1.0 to 13.5 GHz. The microwave transmission coefficient color scale is the same as that shown in Fig. 1. c Color contour plots from the forward model COMSOL simulation of microwave transmission on photonic crystal with oil-filling pattern corresponding to the configurations in a. The contour plots are shown for the range of incident angle 0–180° on the x-axis with a step size of 2°, and there are 33 discrete measurement frequencies along the y-axis over the range 1.0–13.5 GHz. The microwave transmission coefficient color scale is the same as that shown in Fig. 1.
