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Optics and photonics. Test methods for surface imperfections of optical elements
This document specifies the physical principles and practical means for the implementation of methods for evaluating surface imperfections.
For imperfections specified using the visibility method, two inspection methods are described.
For imperfections specified using the dimensional method, three methods are described.
Instruments exist that allow objective measurement of brightness (digital scatterometry) or size (digital microscopy). While these instruments can be used for evaluation of surface imperfections, they are beyond the scope of this document.
This document applies to optical surfaces of components or assemblies such as doublets or triplets.
This document can be applied to optical plastic components; however, attention is drawn to the fact that impact damage to plastic materials often looks very different from that on harder materials as it does not always result in the removal of material but instead can displace material, causing ripples in the surface.
Consequently, visual comparisons of scratch and dig damage to plastic with those on glass or crystalline materials can give very different results.
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