Abstract
The crosslinking gradients in photopolymer material having a curved surface can be determined by using acoustic techniques. The reflection coefficient at the liquid/material interfaces measured by low frequency microechography is related to the mechanical properties of the material and also the profile of the surface. This method makes it possible to take away the effect of relief and local slope and easily to obtain a map of the mechanical properties, in particular of crosslinking density changes and a topography of the surface.
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