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Proceedings Paper

A submersible radiometer for measuring solar UV irradiance over a wide dynamic range
Author(s): John H. Morrow; Thomas P. Comer; Randall N. Lind; James Robertson; Charles R. Booth
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Paper Abstract

The potential for increased ultraviolet (UV) exposure resulting from ozone depletion has helped fuel interest in acquiring accurate in-water measurements of UV irradiance. In the water column, the flux in the UV becomes a vanishingly small signal that must be measured in the presence of a much larger visible component. In addition, the flux of UV in natural waters may be influenced greatly by changes in solar elevation and from focusing/defocusing by surface waves. For these reasons, an instrument that accurately measures the flux of UV in air will not work as well when submerged, and a number of elements must be optimized to produce instruments for use underwater. In response, Biospherical Instruments Inc. has produced the PUV-2500 Profiling Ultraviolet Radiometer. The system is designed to collect time series or vertical profiles of UV (305, 313, 320, 340, 380 and 395nm) and Photosynthetically Active Radiation (PAR: broadband 400-700 nm) irradiance underwater to depths of 350 meters. The PUV-2500 is designed to measure downwelling irradiance with a response capability exceeding nine decades of dynamic range, as well as pressure/depth, and water temperature. The PUV-2510 is a radiometrically-matching surface reference radiometer. Highly versatile because of its small size and lightweight design, the PUV-2500 can be used in traditional vertical profiling mode (surrounded by a lowering frame and supported by its own cable) or, by employing our free-fall design option, in free-descent mode, thereby helping to avoid artifacts associated with ship shadows.

Paper Details

Date Published: 1 July 2003
PDF: 6 pages
Proc. SPIE 4896, Ultraviolet Ground- and Space-based Measurements, Models, and Effects II, (1 July 2003); doi: 10.1117/12.466237
Show Author Affiliations
John H. Morrow, Biospherical Instruments Inc. (United States)
Thomas P. Comer, Biospherical Instruments Inc. (United States)
Randall N. Lind, Biospherical Instruments Inc. (United States)
James Robertson, Biospherical Instruments Inc. (United States)
Charles R. Booth, Biospherical Instruments Inc. (United States)

Published in SPIE Proceedings Vol. 4896:
Ultraviolet Ground- and Space-based Measurements, Models, and Effects II
Wei Gao; Jay R. Herman; Guangyu Shi; Kazuo Shibasaki; James R. Slusser, Editor(s)

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