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Simulated (left column) and measured (right column) pulse-echo and frequency response of the detector: (a) without lens, (b) with PMMA lens, (c) with Stycast 1090SI lens, (d) without lens, (e) with PMMA lens and (f) with Stycast 1090SI lens. (a)-(c) are simulation results signals time-shifted to origin and (d)-(f) are measurement results.
