Share Email Print

Optical Engineering

Scatter-based interpretation of infrared stray light from warm windows in optical instruments
Author(s): Riad Haïdar; Sylvain B. Maine; Nicolas Guérineau; Jérôme Primot
Format Member Price Non-Member Price
PDF $20.00 $25.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

We propose a novel interpretation of stray light, which is modeled using a scattering process. For this, a description and simulations based on the bidirectional scattering distribution function (BSDF) are developed. We focus on the particular example of a window closing an optical cavity. Such a window is known to introduce a stray light component that is experimentally very subtle to handle. Our idea is motivated by the uncomfortable observation that for years, the usual estimation of this parasitic contribution (be it for absolute or relative measurements, for visible or IR applications, for field or laboratory experiments, etc.) was based on the rather imprecise and obviously incorrect assumption (nevertheless today a widely used rule of thumb) that the optical window can be approximated by a graybody emitting in its transparency range. This statement obviously goes against Kirchhoff's law of radiation, and can thus not be physically sound. Various typical experimental situations are explored with our model, and a comparison is made with results given by the rule of thumb. This shows some cases of relative concordance. However, the scatter-based model should provide an individually more accurate estimation, as shown by some examples.

Paper Details

Date Published: 1 November 2006
PDF: 7 pages
Opt. Eng. 45(11) 116402 doi: 10.1117/1.2395927
Published in: Optical Engineering Volume 45, Issue 11
Show Author Affiliations
Riad Haïdar, ONERA (France)
Sylvain B. Maine, Univ. Paris-Sud II (France)
Nicolas Guérineau, ONERA (France)
Jérôme Primot, ONERA (France)

© SPIE. Terms of Use
Back to Top