A simple fiberoptic sensor to detect the penetration of microsensors into sediments and other biogeochemical systems

Ingo Klimant; Gerhard Holst; Michael Kühl

doi:10.4319/lo.1997.42.7.1638

A simple fiberoptic sensor to detect the penetration of microsensors into sediments and other biogeochemical systems

Ingo Klimant, Gerhard Holst, Michael Kühl^*

^*Corresponding author for this work

Marine Biology

19 Citations (Scopus)

Abstract

We have developed a simple and mechanically robust fiberoptic microsensor that enables optical detection of the sediment-water interface at a spatial resolution of <50 μm. The sensor measures with a tapered optical fiber the increased backscatter of near-infrared light near the sediment surface. To determine the sediment surface position independent of ambient light conditions, we developed a miniaturized opto-electronic system with an intensity-modulated laser diode (780 nm) as the light source and a photodiode as the detector. Laboratory tests of our system were done with artificial as well as with various natural sediments and biofilms. Fiberoptic microsensors for surface detection can be combined easily with both electrochemical and optical microsensors for oxygen or other reactive species.

Original language	English
Journal	Limnology and Oceanography
Volume	42
Issue number	7
Pages (from-to)	1638-1643
Number of pages	6
ISSN	0024-3590
DOIs	https://doi.org/10.4319/lo.1997.42.7.1638
Publication status	Published - 1 Jan 1997

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10.4319/lo.1997.42.7.1638

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AU - Holst, Gerhard

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N2 - We have developed a simple and mechanically robust fiberoptic microsensor that enables optical detection of the sediment-water interface at a spatial resolution of <50 μm. The sensor measures with a tapered optical fiber the increased backscatter of near-infrared light near the sediment surface. To determine the sediment surface position independent of ambient light conditions, we developed a miniaturized opto-electronic system with an intensity-modulated laser diode (780 nm) as the light source and a photodiode as the detector. Laboratory tests of our system were done with artificial as well as with various natural sediments and biofilms. Fiberoptic microsensors for surface detection can be combined easily with both electrochemical and optical microsensors for oxygen or other reactive species.

AB - We have developed a simple and mechanically robust fiberoptic microsensor that enables optical detection of the sediment-water interface at a spatial resolution of <50 μm. The sensor measures with a tapered optical fiber the increased backscatter of near-infrared light near the sediment surface. To determine the sediment surface position independent of ambient light conditions, we developed a miniaturized opto-electronic system with an intensity-modulated laser diode (780 nm) as the light source and a photodiode as the detector. Laboratory tests of our system were done with artificial as well as with various natural sediments and biofilms. Fiberoptic microsensors for surface detection can be combined easily with both electrochemical and optical microsensors for oxygen or other reactive species.

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A simple fiberoptic sensor to detect the penetration of microsensors into sediments and other biogeochemical systems

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