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Figure 2

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Example of a Schlieren image, taken using a HeNe laser, of a bounded beam incident (from the top left) onto a thin Aluminum plate. In this example, the Schoch effect with null-strip is caused by a leaky Lamb wave and is visible in reflection. In transmission, the effect is equally visible, though without null-strip. A similar effect occurs for thick plates at the Rayleigh angle.

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