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BS ISO 14997:2017

BS ISO 14997:2017

$142.49

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

Published By Publication Date Number of Pages
BSI 2017 24
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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.

PDF Catalog

PDF Pages PDF Title
2 National foreword
6 Foreword
7 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
10 4 Symbols
5 Inspection methods and levels
11 6 General information regarding visual inspection
7 Evaluation methods for the visibility based specification of surface imperfections
7.1 Visual evaluation (IVV)
7.1.1 General
7.1.2 Typical visual evaluation method
12 7.2 Visibility comparison inspection (ISV)
7.2.1 General
7.2.2 Typical transmitted light visibility comparison method
7.2.3 Alternative transmitted light visibility comparison method
13 7.2.4 Reflective light visibility comparison method
8 Evaluation methods for the dimensional based specification of surface imperfections
8.1 Visual evaluation (IVD)
8.1.1 General
8.1.2 Typical visual evaluation method
8.2 Dimensional comparison inspection (ISD)
8.2.1 General
14 8.2.2 Typical dimensional comparison inspection method
8.3 Dimensional comparison inspection with magnification (IMD)
8.3.1 General
8.3.2 Typical stereo microscope evaluation method
15 9 Test report
17 Annex A (normative) Visual inspection equipment
20 Annex B (informative) Recommended dimensions of artefacts on a dimensional comparison standard
21 Annex C (informative) Number of allowed smaller imperfections with equivalent area of the specified grade
22 Bibliography

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BS ISO 14997:2017
$142.49