Integrating sphere as an absorption chamber for spectroscopy

Robert J. Nordstrom

doi:10.1117/12.341022

26 February 1999 Integrating sphere as an absorption chamber for spectroscopy

Robert J. Nordstrom

Proceedings Volume 3537, Electro-Optic, Integrated Optic, and Electronic Technologies for Online Chemical Process Monitoring; (1999) https://doi.org/10.1117/12.341022
Event: Photonics East (ISAM, VVDC, IEMB), 1998, Boston, MA, United States

Abstract

An integrating sphere is a cavity with high-reflectivity walls, used primarily in precision photometric and reflectance measurements. In addition, it is used to make accurate optical power measurements and to smooth spatial variations in optical beams, by performing the integration of power over the cross-section of the beam. This paper considers the integrating sphere as the containment cavity, in which absorption spectroscopy of uniformly distributed samples is performed. A theoretical presentation of the optical properties of the integrating sphere is made, which leads to an expression for optical transmittance of the sample. This expression is different from the traditional exponential expression of transmittance of Beer-Lambert. The features of this new expression are explored for exploitation in sensitive absorption measurements.

Citation Download Citation

Robert J. Nordstrom "Integrating sphere as an absorption chamber for spectroscopy", Proc. SPIE 3537, Electro-Optic, Integrated Optic, and Electronic Technologies for Online Chemical Process Monitoring, (26 February 1999); https://doi.org/10.1117/12.341022

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