Deep-sea low-light radiometer system

Two single-waveband low-light radiometers were developed to characterize properties of the underwater light field relevant to biological camouflage at mesopelagic ocean depths. Phenomena of interest were vertical changes in downward irradiance of ambient light at wavelengths near 470 nm and 560 nm,...

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Bibliographic Details
Published in:Optics express 2014-12, Vol.22 (24), p.30074-30091
Main Authors: Haag, Justin M, Roberts, Paul L D, Papen, George C, Jaffe, Jules S, Li, Linhai, Stramski, Dariusz
Format: Article
Language:English
Subjects:
Animals
Calibration
Ecosystem
Kinetics
Light
Luminescent Measurements
Nonlinear Dynamics
Oceans and Seas
Optics and Photonics - instrumentation
Radiometry - instrumentation
Spectrum Analysis
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Summary:Two single-waveband low-light radiometers were developed to characterize properties of the underwater light field relevant to biological camouflage at mesopelagic ocean depths. Phenomena of interest were vertical changes in downward irradiance of ambient light at wavelengths near 470 nm and 560 nm, and flashes from bioluminescent organisms. Depth profiles were acquired at multiple deep stations in different geographic regions. Results indicate significant irradiance magnitudes at 560 nm, providing direct evidence of energy transfer as described by Raman scattering. Analysis of a night profile yielded multiple examples of bioluminescent flashes. The selection of high-sensitivity, high-speed silicon photomultipliers as detectors enabled measurement of spectrally-resolved irradiance to greater than 400 m depth.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.22.030074