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Proceedings Paper

Systematic approach for describing the geometry of spectrophotometry
Author(s): Edward A. Early
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Paper Abstract

In the field of spectrophotometry, the value of the quantities depends upon the geometry under which they are measured. Therefore, it is imperative to completely describe the measurement geometry. Many documentary standards specify the geometry for a particular application. However, to accurately specify the geometry, a general, basic understanding of the relevant parameters for describing the geometry is required. A systematic approach for describing the measurement geometry is presented, which will hopefully have a positive impact on documentary standards. The key to describing the geometry is to consider the illuminator and receiver of the instrument as optical systems with pupils and windows. It is these optical systems, together with the reference plane, that determine the sampling aperture of the instrument. The geometry is then completely described by the relations between the sampling aperture and the optical systems of the illuminator and receiver. These concepts are illustrated by considering three configurations of pupils and windows relative to the focal point of an optical system.

Paper Details

Date Published: 8 August 2003
PDF: 11 pages
Proc. SPIE 4826, Fourth Oxford Conference on Spectroscopy, (8 August 2003); doi: 10.1117/12.514528
Show Author Affiliations
Edward A. Early, National Institute of Standards and Technology (United States)

Published in SPIE Proceedings Vol. 4826:
Fourth Oxford Conference on Spectroscopy
Art Springsteen; Michael Pointer, Editor(s)

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