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In situ monitoring of ocean chlorophyll via laser-induced fluorescence backscattering through an optical fiber

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Abstract
  • The first seagoing test of a prototype laser/fiber-optic system for in situ detection of ocean chlorophyll fluorescence is described. Radiation at 488 nm originating from a shipboard argon laser was transmitted through 20 of 200-µm core optical fiber to the distal tip mounted on the microstructure profiler, the Rapid Sampling Vertical Profiler. The backscattered fluorescence emission signal was collected through the same fiber and processed on board ship. A series of measurements indicated that (1) successful isolation of shipinduced vibrations could be achieved using our optical bench framework to maintain optical alignments; (2) ambient chlorophyll concentrations could be detected in situ; (3) a Raman scattering signal from water could also be detected and should provide an internal standard against which chlorophyll fluorescence may be calibrated.
  • This paper was published in Applied Optics and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/ao/home.cfm. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
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  • Timothy J. Cowles, James N. Moum, Russell A. Desiderio, and Stanley M. Angel, "In situ monitoring of ocean chlorophyll via laser-induced fluorescence backscattering through an optical fiber," Applied Optics. 28(3), 595-600 (1989)
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  • 28
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  • 3
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  • This project is supported through NSF grant OCE-8620174 and ONR contract N-00014-87-K-0009.
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