Surface analyzer using deflectometry technique, e.g. for sheet metal, has intensity patterns generated at spatial light modulator and picked up by electronic camera

摘要

A spatial light modulator (1) is positioned in direct proximity to the surface to be tested (2), such that a sequence of intensity patterns generated by an evaluation computer (3) at the light modulator are reflected on the surface (2), and detected by an electronic camera. The camera focusses on the surface region lying directly below the light modulator. The spatial light modulator may be an LCD flat screen with 640x480 pixels.