This paper describes the application of the integrating sphere or cavity to the measurement of the absorption coefficient (cm−1) of a material introduced into the cavity. The absorption coefficient is determined by measuring the decrease in the radiation density within the integrating cavity caused by insertion of the sample. This method has the virtue of being independent of the scattering within the material sample, the reflectivity of the material surface, and the geometry of the sample. The method is particularly attractive for materials with small absorption coefficients. Experimental verification of the method is described showing agreement with direct transmittance measurements to within ±10%.
© 1970 Optical Society of America
Original Manuscript: December 12, 1969
Published: September 1, 1970
P. Elterman, "Integrating Cavity Spectroscopy," Appl. Opt. 9, 2140-2142 (1970)
General Electric Rev.
- F. A. Benford, General Electric Rev., 23, 72 (1920).
- J. Strong, Concepts of Classical Optics (Freeman, San Francisco, 1958), pp. 58–60.
- See Ref. 1, pp. 278–280.
- J. W. T. Walsh, Photometry (Constable, London, 1953), pp. 141, 259.
|Alert me when this paper is cited|
OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.