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Applied Optics

Applied Optics


  • Vol. 40, Iss. 13 — May. 1, 2001
  • pp: 2095–2101

Private life of an integrating sphere: the radiant homogeneity of the Descent Imager–Spectral Radiometer calibration sphere

Bashar Rizk  »View Author Affiliations

Applied Optics, Vol. 40, Issue 13, pp. 2095-2101 (2001)

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Perturbations to an integrating sphere’s radiant uniformity by a protruding optical system are mapped. A sphere provides the Descent Imager–Spectral Radiometer sensor head (DISR SH), a practical platform for many of its subsystems’ calibrations, but the resulting nonuniformity threatens the goal of accurate radiometry. An apparatus with a nearly identical shape is built to measure the radiance variations. The radiance field is found to be very homogeneous (0–2% variations) over two-thirds of the sphere’s surface area, with larger excursions near the SH, away from active fields of view. This provides an accurate platform to transfer absolute calibrations.

© 2001 Optical Society of America

OCIS Codes
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(120.3150) Instrumentation, measurement, and metrology : Integrating spheres
(120.5630) Instrumentation, measurement, and metrology : Radiometry

Original Manuscript: July 21, 2000
Revised Manuscript: January 26, 2001
Published: May 1, 2001

Bashar Rizk, "Private life of an integrating sphere: the radiant homogeneity of the Descent Imager–Spectral Radiometer calibration sphere," Appl. Opt. 40, 2095-2101 (2001)

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  1. W. A. Hovis, J. S. Knoll, “Characteristics of an internally illuminated calibration sphere.” Appl. Opt. 22, 4004–4007 (1983). [CrossRef]
  2. M. G. Tomasko, D. Buchhauser, M. Bushroe, L. E. Dafoe, L. R. Doose, A. Eibl, C. Fellows, E. McFarlane, G. M. Prout, M. J. Pringle, B. Rizk, C. See, P. H. Smith, K. Tsetsenekos are preparing a manuscript to be called “The descent imager/spectral radiometer (DISR) experiment on the Huygens entry probe of Titan.”

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