Compact optical sensor for real-time monitoring of bacterial growth for space applications
2001
During long-duration manned space-missions complex chemical and biological processes need to
be managed accurately for the recycling of human wastes and to produce human consumables. As
a result, there is an increasing interest in how the characteristics of microbes are influenced by
micro-gravity. Compact optical instrumentation allows for real-time and non-invasive
measurement of bacterial growth parameters during flight experiments. In close collaboration, the
National Aerospace Laboratory NLR of the Netherlands and Bioclear Environmental
Biotechnology developed and tested an on-line optical biomass sensor successfully. The sensor
concept is based on a turbidity measurement technique operating in the VIS-blue part of the light
spectrum with use of blue LED sources. A diagnostic tool has been developed using compact
spectrometers and optical fibres to characterise bacterial cultures. As a result a few sensor
applications operating at different colours and sensor layouts are discussed in the paper.
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