Fig. 4 Picture of the conical latex membrane model painted with holographic dust. The flat latex membrane was first clamped along the circular boundary of the hollow metal tube, and then was deformed by pushing with a rod at the center of the membrane. Fig. 5 Shape measurement on conical latex membrane: (a) optical phase, (b) 3D plot of the real shape, and (c) 3D plot of the shape with normal vector. 204
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