An
innovative concept for an electronic nose (eNose) system based
on a unique combination of analog and digital sensors for online monitoring
is presented. The developed system consists of small sensing arrays
of commercially available semiconducting metal oxide (MOX) gas sensors
in a compact, modular, low sample volume, temperature-controlled sensing
chamber. The sensing chamber comprises three compartments, each of
which may contain several analog and/or digital MOX sensors. Additional
sensors within the digital compartment allow for pressure, humidity,
and temperature measurements. The presented prototype eNose system
comprises one compartment with 8 analog MOX sensors and two compartments
with 10 digital sensors each and was explicitly tested here for the
discrimination between midrange (3–18 ppm) concentrations of
ethanol and acetone at dry and moderately humid conditions.
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