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  4. Colorimetric sensor for bad odor detection using automated color correction
 
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2017
Conference Paper
Title

Colorimetric sensor for bad odor detection using automated color correction

Abstract
Colorimetric sensors based on color-changing dyes offer a convenient approach for the quantitative measurement of gases. An integrated, mobile colorimetric sensor can be particularly helpful for occasional gas measurements, such as informal air quality checks for bad odors. In these situations, the main requirement is high availability, easy usage, and high specificity towards one single chemical compound, combined with cost-efficient production. In this contribution, we show how a well stablished colorimetric method can be adapted for easy operation and readout, making it suitable for the untrained end user. As an example, we present the use of pH indicators for the selective and reversible detection of NH3 in air (one relevant gas contributing to bad odors) using gas-sensitive layers dip coated on glass substrates. Our results show that the method can be adapted to detect NH3 concentrations lower than 1 ppm, with measure-to-result times in the range of a few minutes. We demonstrate that the color measurements can be carried out with the optical signals of RGB sensors, without losing quantitative performance.
Author(s)
Schmitt, Katrin  
Tarantik, Karina
Pannek, Carolin  
Benito-Altamirano, Ismael
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Casals, Olga
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Fabrega, Cristian
Romano-Rodriguez, Albert
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Wöllenstein, Jürgen  
Prades, Juan Daniel
Mainwork
Smart Sensors, Actuators, and MEMS VIII  
Conference
Conference "Smart Sensors, Actuators, and MEMS" 2017  
Open Access
DOI
10.24406/publica-r-397442
10.1117/12.2265990
File(s)
N-461466.pdf (1.38 MB)
Rights
Under Copyright
Language
English
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Keyword(s)
  • colorimetric sensor

  • Ammonia Detection

  • Automated Color Correction

  • RGB

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