Equivalent path lengths in an integrating cavity: comment

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https://opg.optica.org/ao/abstract.cfm?uri=ao-49-4-575

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https://doi.org/10.1364/AO.49.000575
 http://hdl.handle.net/11603/24985

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UMBC Physics Department
UMBC Joint Center for Earth Systems Technology (JCET)

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https://orcid.org/0000-0003-4695-5200

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2010-01-22

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journal articles
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Edward S. Fry, George W. Kattawar, Benjamin D. Strycker, and Peng-Wang Zhai."Equivalent path lengths in an integrating cavity: comment". Applied Optics 49(4) (01 February 2010) 575-577. https://doi.org/10.1364/AO.49.000575.

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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract

The equivalent absorption path length in an integrating cavity is examined. In an otherwise excellent paper, Tranchart et al. [Appl. Opt. 35, 7070 (1996)] made an important error in obtaining the expressions for the equivalent path length in an integrating cavity. This error has been propagated through several other publications in the literature. Since the equivalent path length is the sine qua non for obtaining an accurate absorption coefficient when using an integrating cavity, it is our intent here to give the correct formulas to prevent further errors when extracting absorption coefficients.