Measurement of surface form after coating application is a vital final quality control step, but generally difficult using noncontact optical methods as the signal is distorted or drastically reduced by the coating. The NMF non-contact measurement machine range for freeform optics by Dutch United Instruments (DUI) can be employed for measurements during the entire production process. It can measure ground, polished and coated surfaces. Especially non-uniform coated surfaces may however distort the signal of the probe. A correction technique is described that allows for correcting this influence, enabling accurate non-contact form measurement after application of the coating.
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