Proceedings PaperDC substitution methods in metrology
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DC substitution methods are used for the measurement of a wide range of physical parameters across the whole electromagnetic spectrum. A summary is given of the principles involved with a view to alerting users of such techniques in the area of optical radiation measurement to related work in other areas of metrology. Because of the similarity of the methods, much useful information and insight can be gained from such a wider perspective. This applies to both the striking similarity of the techniques and the analysis of required instrumental corrections.