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ISO - 14997

Optics and photonics - Test methods for surface imperfections of optical elements

active, Most Current
Organization: ISO
Publication Date: 1 August 2017
Status: active
Page Count: 22
ICS Code (Optical equipment): 37.020
scope:

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. The first is visual evaluation of the surface without any comparison standard (IVV). The second is a visibility assessment of a surface imperfection when compared to an artefact of known brightness (ISV).

For imperfections specified using the dimensional method, three methods are described. The first is visual evaluation of the surface without any comparison standard (IVD). The second is a dimensional assessment of a surface imperfection when compared to an artefact of known size (ISD). The third is the dimensional measurement of a surface imperfection using magnification and either a comparison artefact of known size or a reticle or ruler (IMD).

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.

Document History

14997
August 1, 2017
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,...
April 15, 2011
Optics and photonics - Test methods for surface imperfections of optical elements
This International Standard establishes the physical principles and practical means for the implementation of methods for measuring surface imperfections. This method evaluates the surface area...
April 15, 2003
Optics and optical instruments Test methods for surface imperfections of optical elements
A description is not available for this item.

References

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