Forskning ved Københavns Universitet - Københavns Universitet

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

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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.

OriginalsprogEngelsk
TidsskriftLimnology and Oceanography
Vol/bind42
Udgave nummer7
Sider (fra-til)1638-1643
Antal sider6
ISSN0024-3590
DOI
StatusUdgivet - 1 jan. 1997

ID: 201683111