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Autor

  • Bartholmai, Matthias (2)
  • Noske, Reinhard (2)
  • Banach, Ulrich (1)
  • Ebert, Sebastian (1)
  • Gawlitza, Kornelia (1)
  • Lazik, D. (1)
  • Neumann, Patrick P. (1)
  • Rehak, W. (1)
  • Rurack, Knut (1)
  • Tiebe, Carlo (1)
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Erscheinungsjahr

  • 2017 (1)
  • 2015 (1)

Sprache

  • Englisch (2) (entfernen)

Schlagworte

  • Air quality monitoring (1)
  • Ammonia gas sensor (1)
  • Fluorescence (1)
  • Gas storage sites (1)
  • Methane measuring (1)
  • Miniaturized sensor device (1)
  • Quantification of gas concentrations (1)
  • Selective permeability (1)
  • Spatially distributed monitoring (1)
  • Standard gas generator (1)
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Organisationseinheit der BAM

  • 4.2 Materialien und Luftschadstoffe (2) (entfernen)

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Novel sensor for long-term monitoring of ammonia in gas phase (2017)
Gawlitza, Kornelia ; Tiebe, Carlo ; Banach, Ulrich ; Noske, Reinhard ; Bartholmai, Matthias ; Rurack, Knut
Because ammonia and its reaction products can cause considerable damage to human health and ecosystems, there is a need for reliably operating and reversibly interacting sensor materials to monitor traces of gaseous ammonia in ambient air, which at best can be used on-site for in-the-field measurements. Herein, the development of a sensor material for gaseous ammonia in the lower ppm to ppb range using optical fluorescence as transduction mechanism is presented. A fluorescent dye, which shows reversible fluorescence enhancement in the presence of ammonia is incorporated into a polymer matrix, the latter to ensure the accumulation of ammonia. The sensor material is integrated into a prototype of a miniaturized sensor device, facilitating long-term operation. To calibrate the optical sensor system a gas standard generator, producing standard gas mixtures, is used, leading to a sensitivity down to lower ppm concentrations of ammonia.
Linear gas sensor for methane based on a selectively permeable membrane (2015)
Bartholmai, Matthias ; Ebert, Sebastian ; Neumann, Patrick P. ; Noske, Reinhard ; Rehak, W. ; Lazik, D.
In preliminary work, gas sensors in linear form based on the measuring principle of gas selective permeability through a membrane were developed and introduced for the detection and quantification of gas concentrations. In this study, first experimental results are presented for adapting the technology for measuring methane (CH4). A material with suitable selective permeability was identified and utilized in a sensor setup containing the gas selective membrane and a reference membrane, both integrated in a measuring cell, to which a gas stream with defined CH4 concentrations was applied. The results prove the sensor's capability for measuring methane and indicate further application potential of the method, e.g., as a robust field monitoring technology, since CH4 is the major component of natural gas, town gas, and fracking gas.
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