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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

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

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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