Cox, M G; Harris, P M; Kenward, P D; Woolliams, E (2003) Spectral characteristic modelling. NPL Report. CMSC 27/03

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Abstract

The modelling of the spectral characteristics of sources and detectors in optical radiation metrology is addressed. The major objective is to provide an approach for obtaining mathematical models of spectral characteristics that are specified directly or indirectly by measurements at a set of wavelength values spanning a spectral region. A further objective is to evaluate the uncertainties associated with the models given the uncertainties associated with the measurements.
Because no wholly physical models are available, models are used that are based partly on recognised or observed physical behaviour, and include a variable number of empirical terms in order that they have the flexibility to adapt to a range of source and detector characteristics.
The effects of the slit bandwidth of the monochomators used for spectral measurement are studied in detail, because of their influence on obtaining models that are valid for the required rather than the indicated characteristics.
Application of the concepts developed is made to source and detector data.
Suggestions for future work to improve the models developed are made. Further applications in optical radiation metrology are identified that could benefit from such models.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	CMSC 27/03
Keywords:	lamps, optical radiation, Planck function
Subjects:	Mathematics and Scientific Computing Mathematics and Scientific Computing > Modelling
Last Modified:	02 Feb 2018 13:16
URI:	http://eprintspublications.npl.co.uk/id/eprint/2717

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