Resonant Photoacoustic Detection of NO<sub>2</sub> with an LED Based Sensor

Resonant Photoacoustic Detection of NO<sub>2</sub> with an LED Based Sensor

In times of steadily increasing air pollution especially in urban areas, the monitoring of nitrogen dioxide (NO<sub>2</sub>) has gained in importance and with it the search for compact, low-cost sensors. We present a novel approach to measure NO<sub>2</sub> in sub-ppm concent...

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Main Authors: Christian Weber, Johannes Kapp, Katrin Schmitt, Hans-Fridtjof Pernau, Jürgen Wöllenstein
Format: Article
Language:English
Published: MDPI AG 2018-11-01
Series:Proceedings
Subjects:
resonant photoacoustic sensor
LED
NO<sub>2</sub> detection
Online Access:https://www.mdpi.com/2504-3900/2/13/1036
id doaj-51f1f5f4e41747adaca8ac86fce87fe7
record_format Article
spelling doaj-51f1f5f4e41747adaca8ac86fce87fe72020-11-24T23:20:36ZengMDPI AGProceedings2504-39002018-11-01213103610.3390/proceedings2131036proceedings2131036Resonant Photoacoustic Detection of NO<sub>2</sub> with an LED Based SensorChristian Weber0Johannes Kapp1Katrin Schmitt2Hans-Fridtjof Pernau3Jürgen Wöllenstein4Fraunhofer Institute for Physical Measurement Techniques IPM, 79110 Freiburg, GermanyDepartment of Microsystems Engineering-IMTEK, University of Freiburg, 79110 Freiburg, GermanyFraunhofer Institute for Physical Measurement Techniques IPM, 79110 Freiburg, GermanyFraunhofer Institute for Physical Measurement Techniques IPM, 79110 Freiburg, GermanyFraunhofer Institute for Physical Measurement Techniques IPM, 79110 Freiburg, GermanyIn times of steadily increasing air pollution especially in urban areas, the monitoring of nitrogen dioxide (NO<sub>2</sub>) has gained in importance and with it the search for compact, low-cost sensors. We present a novel approach to measure NO<sub>2</sub> in sub-ppm concentrations with a photoacoustic sensor utilizing a T-shaped resonance cell. An inexpensive single LED with a peak wavelength of 410 nm was used as radiation source and the acoustic detection was done with a commercial MEMS microphone. For optimal coupling of the divergent LED light into the cell, the T-shaped resonator was developed and fabricated with rapid prototyping methods. The resonator shows a acoustic Q-factor &gt;10 while having nearly no zero gas signal.https://www.mdpi.com/2504-3900/2/13/1036resonant photoacoustic sensorLEDNO<sub>2</sub> detection
collection DOAJ
language English
format Article
sources DOAJ
author Christian Weber
Johannes Kapp
Katrin Schmitt
Hans-Fridtjof Pernau
Jürgen Wöllenstein
spellingShingle Christian Weber
Johannes Kapp
Katrin Schmitt
Hans-Fridtjof Pernau
Jürgen Wöllenstein
Resonant Photoacoustic Detection of NO<sub>2</sub> with an LED Based Sensor
Proceedings
resonant photoacoustic sensor
LED
NO<sub>2</sub> detection
author_facet Christian Weber
Johannes Kapp
Katrin Schmitt
Hans-Fridtjof Pernau
Jürgen Wöllenstein
author_sort Christian Weber
title Resonant Photoacoustic Detection of NO<sub>2</sub> with an LED Based Sensor
title_short Resonant Photoacoustic Detection of NO<sub>2</sub> with an LED Based Sensor
title_full Resonant Photoacoustic Detection of NO<sub>2</sub> with an LED Based Sensor
title_fullStr Resonant Photoacoustic Detection of NO<sub>2</sub> with an LED Based Sensor
title_full_unstemmed Resonant Photoacoustic Detection of NO<sub>2</sub> with an LED Based Sensor
title_sort resonant photoacoustic detection of no<sub>2</sub> with an led based sensor
publisher MDPI AG
series Proceedings
issn 2504-3900
publishDate 2018-11-01
description In times of steadily increasing air pollution especially in urban areas, the monitoring of nitrogen dioxide (NO<sub>2</sub>) has gained in importance and with it the search for compact, low-cost sensors. We present a novel approach to measure NO<sub>2</sub> in sub-ppm concentrations with a photoacoustic sensor utilizing a T-shaped resonance cell. An inexpensive single LED with a peak wavelength of 410 nm was used as radiation source and the acoustic detection was done with a commercial MEMS microphone. For optimal coupling of the divergent LED light into the cell, the T-shaped resonator was developed and fabricated with rapid prototyping methods. The resonator shows a acoustic Q-factor &gt;10 while having nearly no zero gas signal.
topic resonant photoacoustic sensor
LED
NO<sub>2</sub> detection
url https://www.mdpi.com/2504-3900/2/13/1036
work_keys_str_mv AT christianweber resonantphotoacousticdetectionofnosub2subwithanledbasedsensor
AT johanneskapp resonantphotoacousticdetectionofnosub2subwithanledbasedsensor
AT katrinschmitt resonantphotoacousticdetectionofnosub2subwithanledbasedsensor
AT hansfridtjofpernau resonantphotoacousticdetectionofnosub2subwithanledbasedsensor
AT jurgenwollenstein resonantphotoacousticdetectionofnosub2subwithanledbasedsensor
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