Figure 2
Top view on acoustic device with numerical simulation and schlieren images. a) Absolute pressure field |p| obtained with a FEM simulation as colour graph at 2.105 MHz, 0.5 mm PMMA frame (white) and piezo element (brown). b) Dark field filter grain extract schlieren image at 2.105 MHz. c) x-direction knife edge filter grain extract schlieren image at 1.650 MHz. In the schlieren images the darkest shade is a pressure node for image areas with a local change of gray shades.