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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 35, Iss. 22 — Aug. 1, 1996
  • pp: 4385–4391

Luminous-flux measurements by an absolute integrating sphere

Maria Luisa Rastello, Elio Miraldi, and Paolo Pisoni  »View Author Affiliations


Applied Optics, Vol. 35, Issue 22, pp. 4385-4391 (1996)
http://dx.doi.org/10.1364/AO.35.004385


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Abstract

We present an original implementation of the absolute-sphere method recently proposed by Ohno. The luminous-flux unit, the lumen, is realized by means of an integrating sphere with an opening calibrated by a luminous-intensity standard placed outside. The adapted experimental setup permits one to measure luminous-flux values between 5 and 2500 lm with a significant improvement with respect to the simulated performances reported in the literature. Traditionally, the luminous-flux unit, the lumen, is realized by goniophotometric techniques in which the luminous-intensity distribution is measured and integrated over the whole solid angle. Thus sphere results are compared with those obtained with the Istituto Elettrotecnico Nazionale goniophotometer. In particular, a set of standards, characterized by luminous-flux values of ~2000 lm, has been calibrated with both techniques. We highlight some of the problems encountered. Experimental results show that the agreement between the two methods is within the estimated uncertainty and suggest promising areas for future research.

© 1996 Optical Society of America

History
Original Manuscript: August 14, 1995
Revised Manuscript: January 18, 1996
Published: August 1, 1996

Citation
Maria Luisa Rastello, Elio Miraldi, and Paolo Pisoni, "Luminous-flux measurements by an absolute integrating sphere," Appl. Opt. 35, 4385-4391 (1996)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-35-22-4385

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