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Proceedings Paper

Light field and water clarity simulation of natural environments in laboratory conditions
Author(s): Shachak Pe'eri; Glenn Shwaery
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Paper Abstract

Simulation of natural oceanic conditions in a laboratory setting is a challenging task, especially when that environment can be miles away. We present an attempt to replicate the solar radiation expected at different latitudes with varying water clarity conditions up to 30 m in depth using a 2.5 m deep engineering tank at the University of New Hampshire. The goals of the study were: 1) to configure an underwater light source that produced an irradiance spectrum similar to natural daylight with the sun at zenith and at 60° under clear atmospheric conditions, and 2) to monitor water clarity as a function of depth. Irradiance was measured using a spectra-radiometer with a cosine receiver to analyze the output spectrum of submersed lamps as a function of distance. In addition, an underwater reflection method was developed to measure the diffuse attenuation coefficient in real time. Two water clarity types were characterized, clear waters representing deep, open-ocean conditions, and murky waters representing littoral environments. Results showed good correlation between the irradiance measured at 400 nm to 600 nm and the natural daylight spectrum at 3 m from the light source. This can be considered the water surface conditions reference. Using these methodologies in a controlled laboratory setting, we are able to replicate illumination and water conditions to study the physical, chemical and biological processes on natural and man-made objects and/or systems in simulated, varied geographic locations and environments.

Paper Details

Date Published: 11 June 2012
PDF: 7 pages
Proc. SPIE 8372, Ocean Sensing and Monitoring IV, 83721A (11 June 2012); doi: 10.1117/12.918695
Show Author Affiliations
Shachak Pe'eri, The Univ. of New Hampshire (United States)
Glenn Shwaery, The Univ. of New Hampshire (United States)

Published in SPIE Proceedings Vol. 8372:
Ocean Sensing and Monitoring IV
Weilin Will Hou; Robert Arnone, Editor(s)

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