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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN 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)
http://dx.doi.org/10.1364/AO.40.002095


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Abstract

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

Citation
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)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-13-2095


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References

  1. W. A. Hovis and J. S. Knoll, “Characteristics of an internally illuminated calibration sphere.” Appl. Opt. 22, 4004–4007 (1983).
  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, and 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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