What is it about?
Optical glass types for best color correction are often valued by their deviation of the relative partial dispersion from the normal line. Since the normal line is defined differently among the manufacturers direct comparison of data sheet values are misleading. We propose a set of well-defined new normal lines for various relative partial dispersions.
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Why is it important?
Comparison of physical properties of materials such as optical glass types requires a commonly agreed definition of these properties. Otherwise comparison results are wrong and decisions basing on them also.
Perspectives
The deviation of the relative partial dispersion from the normal line was introduced with the SCHOTT catalog of 1966 without detailed documentation or a separate scientific publication. In the course of the time the origin was forgotten probably and due to this varying normal line definitions led to increasing inconsitstency. Independent observations in Japan and Germany showed that there was a problem. A thorough analysis led to the present publication with a proposal for improvement. this is already introduced to the revision process of the raw glass standard ISO 12123 and will most possibly be part of the next revision to be expected in 2016.
Dr Peter Hartmann
SCHOTT AG retired
Read the Original
This page is a summary of: Optical glass: deviation of relative partial dispersion from the normal line—need for a common definition, Optical Engineering, October 2015, SPIE,
DOI: 10.1117/1.oe.54.10.105112.
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