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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 6, Iss. 4 — May. 4, 2011

Method for more accurate transmittance measurements of low-angle scattering samples using an integrating sphere with an entry port beam diffuser

Annica M. Nilsson, Andreas Jonsson, Jacob C. Jonsson, and Arne Roos  »View Author Affiliations


Applied Optics, Vol. 50, Issue 7, pp. 999-1006 (2011)
http://dx.doi.org/10.1364/AO.50.000999


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Abstract

For most integrating sphere measurements, the difference in light distribution between a specular reference beam and a diffused sample beam can result in significant errors. The problem becomes especially pronounced in integrating spheres that include a port for reflectance or diffuse transmittance measurements. The port is included in many standard spectrophotometers to facilitate a multipurpose instrument, however, absorption around the port edge can result in a detected signal that is too low. The absorption effect is especially apparent for low-angle scattering samples, because a significant portion of the light is scattered directly onto that edge. In this paper, a method for more accurate transmittance measurements of low-angle light-scattering samples is presented. The method uses a standard integrating sphere spectrophotometer, and the problem with increased absorption around the port edge is addressed by introducing a diffuser between the sample and the integrating sphere during both reference and sample scan. This reduces the discrepancy between the two scans and spreads the scattered light over a greater portion of the sphere wall. The problem with multiple reflections between the sample and diffuser is successfully addressed using a correction factor. The method is tested for two patterned glass samples with low-angle scattering and in both cases the transmittance accuracy is significantly improved.

© 2011 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.3150) Instrumentation, measurement, and metrology : Integrating spheres

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: September 27, 2010
Revised Manuscript: January 10, 2011
Manuscript Accepted: January 13, 2011
Published: February 24, 2011

Virtual Issues
Vol. 6, Iss. 4 Virtual Journal for Biomedical Optics

Citation
Annica M. Nilsson, Andreas Jonsson, Jacob C. Jonsson, and Arne Roos, "Method for more accurate transmittance measurements of low-angle scattering samples using an integrating sphere with an entry port beam diffuser," Appl. Opt. 50, 999-1006 (2011)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ao-50-7-999


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References

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