Fig. 1. Image of a cross section of the prism film used to analyze the contour (57×).

Fig. 2. Edge map (black color) with Hough lines identified (red color) in a prismatic film profile with a curvature of 20  m−1.

Fig. 3. The HT of the three-prism image of a prismatic film curvature of 20  m−1 with the Hough peak identified. The red square shows the peaks of data in the Hough matrix and indicates ρ, the perpendicular distance from the origin to the line and θ is the angle at which the sum of the intensities in the image peaks.

Fig. 4. Angle θ obtained by HT related to the CPLG curvature. The graph legend shows the curvatures evaluated in m−1. Global changes in the prismatic angle related to the Hough peaks are shown in (a) and local changes in prism half-angle in (b).

Fig. 5. Experimental setup for the transmittance measurements (upper view).

Fig. 6. Light flux rate (rate of flux lost) scaled from 0 to 1.0 as a function of the curvature of a CPLG for several incidence angles. The graph legend shows incidence angles with regard to the prismatic film flat surface.

Fig. 7. Flux loss rate obtained in tridimensional simulations of CPLG guides with curvatures of (a) 8.00 and (b) 57.14.