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Proceedings Paper

Infrared standards for system calibration
Author(s): Frank J.J. Clarke
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Paper Abstract

Space and military applications of optical systems require proof of performance of components at acceptance of contract and an active QA system in use throughout manufacture. To support these and other requirements the National Physical Laboratory provides a range of IR spectrophotometric reference standards that are individually calibrated to a known uncertainty of absolute measurement under conditions that match the customer's needs. These standards of transmittance, of regular reflectance, of hemispherical reflectance and of wavenumber are necessary because of the significant errors that may occur in IR spectrophotometers. The nature and causes of the errors are discussed, and why they are worse in IR instruments than in UV/visible ones. The NPL techniques, equipment and special modifications are described. Stable samples submitted by customers are also calibrated, and in some cases these have the advantage of giving an advantageous like-with-like measuring situation for the customer.

Paper Details

Date Published: 19 August 1996
PDF: 12 pages
Proc. SPIE 2775, Specification, Production, and Testing of Optical Components and Systems, (19 August 1996); doi: 10.1117/12.246735
Show Author Affiliations
Frank J.J. Clarke, National Physical Lab. (United Kingdom)


Published in SPIE Proceedings Vol. 2775:
Specification, Production, and Testing of Optical Components and Systems
Anthony E. Gee; Jean-Francois Houee, Editor(s)

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