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.
Our recently demonstrated innovative concept of electronic nose (eNose) based on a combination of gas sensors was further tested and benchmarked in the present study. The system is a test...
In this work, a new generation of eNose systems particularly suited for exhaled breath gas analysis is presented. The developed analyzer system comprises a compact modular, low volume, temperature controlled sensing chamber explicitly tested for the detection of acetone, isoprene, pentane and isopropanol. The eNose system sensing chamber consists of three compartments, each of which can contain 8 analog Metal Oxide (MOX) sensors or 10 digital MOX sensors. Additional sensors within the digital compartment allow for pressure, humidity and temperature measurements. The presented eNose system contains a sensor array with up to 30 physical sensors and provides the ability to discriminate between low VOC concentrations under dry and humid conditions. The MOX sensor signals were analyzed by pattern recognition methods.
According to their
materials and operating parameters, metal oxide
(MOX) sensors respond to target gases only by a change in sensor resistance
with a lack in selectivity. By the use of infrared spectroscopy, highly
discriminatory information from samples at a molecular level can be
obtained and the selectivity can be enhanced. A low-volume gas cell
was developed for a commercially available semiconducting MOX methane
gas sensor and coupled directly to a mid-infrared gas sensor based
on substrate-integrated hollow waveguide (iHWG) technology combined
with a Fourier transform infrared spectrometer. This study demonstrates
a sensing process with combined orthogonal sensors for fast, time-resolved,
and synergic detection of methane and carbon dioxide in gas samples.
In this work, a new generation of gas sensing systems specially designed for breath analysis is presented. The developed system comprises a compact modular, low volume, temperature-controlled sensing chamber with three compartments that can host different sensor types. In the presented system, one compartment contains an array of 8 analog MOX sensors and the other two 10 digital MOX sensors each. Here, we test the system for the detection of low concentrations of several compounds.
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