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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 43, Iss. 32 — Nov. 10, 2004
  • pp: 5981–5986

Use of a Spectralon panel to measure the downwelling irradiance signal: case studies and recommendations

David Doxaran, Nagur C. Cherukuru, Samantha J. Lavender, and Gerald F. Moore  »View Author Affiliations


Applied Optics, Vol. 43, Issue 32, pp. 5981-5986 (2004)
http://dx.doi.org/10.1364/AO.43.005981


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Abstract

Field determinations of the remote sensing reflectance signal are necessary to validate ocean color satellite sensors. The measurement of the above-water downwelling irradiance signal E d (0+) is commonly made with a reference plaque of a known reflectance. The radiance reflected by the plaque (Ldspec) can be used to determine E d (0+) if the plaque is assumed to be near Lambertian. To test this assumption, basic experiments were conducted on a boat under changing sky conditions (clear, cloudy, covered) and with different configurations for simultaneous measurements of Ldspec and E d (0+). For all measurement configurations, results were satisfactory under a clear sky. Under cloudy or covered skies, shadow effects on the plaque induced errors up to 100% in the determination of E d (0+). An appropriate measurement configuration was defined, which enabled E d (0+) to be determined with an accuracy of better than ±15% regardless of the sky conditions.

© 2004 Optical Society of America

OCIS Codes
(000.2170) General : Equipment and techniques
(010.4450) Atmospheric and oceanic optics : Oceanic optics
(120.4800) Instrumentation, measurement, and metrology : Optical standards and testing

History
Original Manuscript: February 6, 2004
Revised Manuscript: August 2, 2004
Published: November 10, 2004

Citation
David Doxaran, Nagur C. Cherukuru, Samantha J. Lavender, and Gerald F. Moore, "Use of a Spectralon panel to measure the downwelling irradiance signal: case studies and recommendations," Appl. Opt. 43, 5981-5986 (2004)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-43-32-5981

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