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Journal of Sensors and Sensor Systems An open-access peer-reviewed journal
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Volume 3, issue 2
J. Sens. Sens. Syst., 3, 253-263, 2014
https://doi.org/10.5194/jsss-3-253-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Advanced functional materials for environmental monitoring...

J. Sens. Sens. Syst., 3, 253-263, 2014
https://doi.org/10.5194/jsss-3-253-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular research article 21 Oct 2014

Regular research article | 21 Oct 2014

Selective detection of hazardous VOCs for indoor air quality applications using a virtual gas sensor array

M. Leidinger1, T. Sauerwald1, W. Reimringer2, G. Ventura3, and A. Schütze1 M. Leidinger et al.
  • 1Saarland University, Lab for Measurement Technology, Saarbrücken, Germany
  • 23S GmbH, Saarbrücken, Germany
  • 3IDMEC – Institute of Mechanical Engineering, Porto, Portugal

Abstract. An approach for detecting hazardous volatile organic compounds (VOCs) in ppb and sub-ppb concentrations is presented. Using three types of metal oxide semiconductor (MOS) gas sensors in temperature cycled operation, formaldehyde, benzene and naphthalene in trace concentrations, reflecting threshold limit values as proposed by the WHO and European national health institutions, are successfully identified against a varying ethanol background of up to 2 ppm. For signal processing, linear discriminant analysis is applied to single sensor data and sensor fusion data.

Integrated field test sensor systems for monitoring of indoor air quality (IAQ) using the same types of gas sensors were characterized using the same gas measurement setup and data processing. Performance of the systems is reduced due to gas emissions from the hardware components. These contaminations have been investigated using analytical methods. Despite the reduced sensitivity, concentrations of the target VOCs in the ppb range (100 ppb of formaldehyde; 5 ppb of benzene; 20 ppb of naphthalene) are still clearly detectable with the systems, especially when using the sensor fusion method for combining data of the different MOS sensor types.

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An approach for detecting hazardous volatile organic compounds (VOCs) in ppb and sub-ppb concentrations is presented. Using metal oxide semiconductor (MOS) gas sensors in temperature cycled operation, VOCs in trace concentrations are successfully identified against a varying ethanol background of up to 2 ppm. For signal processing, linear discriminant analysis is applied to single sensor data and sensor fusion data. Integrated gas sensor systems using the same MOS sensors were characterized.
An approach for detecting hazardous volatile organic compounds (VOCs) in ppb and sub-ppb...
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