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Colorimetric sensor for bad odor detection using automated color correction
Author(s): K. Schmitt; K. Tarantik; C. Pannek; I. Benito-Altamirano; O. Casals; C. Fàbrega; A. Romano-Rodríguez; J. Wöllenstein; J. D. Prades
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Paper 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.

Paper Details

Date Published: 2 June 2017
PDF: 10 pages
Proc. SPIE 10246, Smart Sensors, Actuators, and MEMS VIII, 102461F (2 June 2017); doi: 10.1117/12.2265990
Show Author Affiliations
K. Schmitt, Fraunhofer-Institut für Physikalische Messtechnik (Germany)
K. Tarantik, Fraunhofer-Institut für Physikalische Messtechnik (Germany)
C. Pannek, Fraunhofer-Institut für Physikalische Messtechnik (Germany)
I. Benito-Altamirano, Univ. de Barcelona (Spain)
O. Casals, Univ. de Barcelona (Spain)
C. Fàbrega, Univ. de Barcelona (Spain)
A. Romano-Rodríguez, Univ. de Barcelona (Spain)
J. Wöllenstein, Fraunhofer-Institut für Physikalische Messtechnik (Germany)
Univ. of Freiburg (Germany)
J. D. Prades, Univ. de Barcelona (Spain)


Published in SPIE Proceedings Vol. 10246:
Smart Sensors, Actuators, and MEMS VIII
Luis Fonseca; Mika Prunnila; Erwin Peiner, Editor(s)

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