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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Glenn D. Boreman
  • Vol. 44, Iss. 28 — Oct. 1, 2005
  • pp: 5894–5898

Determination of the diffuser reference plane for accurate illuminance responsivity calibrations

Jari Hovila, Maria Mustonen, Petri Kärhä, and Erkki Ikonen  »View Author Affiliations


Applied Optics, Vol. 44, Issue 28, pp. 5894-5898 (2005)
http://dx.doi.org/10.1364/AO.44.005894


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Abstract

It is difficult to predict where the effective measurement plane is situated with dome-shaped diffusers often used in commercial photometers and radiometers. Insufficient knowledge of this plane could lead to large systematic errors in calibration of the illuminance responsivity of photometers. We propose a method that can be used to determine this reference plane accurately, based on the inverse-square law between the measured signal and the distance from the source. The method is demonstrated with three commercial photometers with dome-shaped diffusers of different geometries. By taking into account the measured shifts of the reference planes (5.0 ± 0.5 mm, 7.8 ± 0.3 mm, and 8.5 ± 0.7 mm), we reduced the systematic measurement errors up to 2% to statistical uncertainty components at the level of 0.2%.

© 2005 Optical Society of America

OCIS Codes
(120.3940) Instrumentation, measurement, and metrology : Metrology
(120.5240) Instrumentation, measurement, and metrology : Photometry
(230.1980) Optical devices : Diffusers

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: November 29, 2004
Revised Manuscript: May 4, 2005
Manuscript Accepted: May 4, 2005
Published: October 1, 2005

Citation
Jari Hovila, Maria Mustonen, Petri Kärhä, and Erkki Ikonen, "Determination of the diffuser reference plane for accurate illuminance responsivity calibrations," Appl. Opt. 44, 5894-5898 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-28-5894

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