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Abstract
The rising effort to track local air pollution measurements require low-cost air quality sensors that provide good accuracy, long-term stability and possibly Internet of Things (IoT) connectivity. To provide such a solution and avoid cost-intensive equipment the development of a low-cost environmental sensor system was started. To measure the pollutant NO2, a quartz-enhanced photoacoustic spectroscopy (QEPAS) setup was established. A pulsed 450 nm laser diode excites NO2 molecules due to its strong absorption at this wavelength and causes a vibrational-translational relaxation, which results in an acoustic wave. The acoustic wave is detected by a quartz tuning fork (QTF) which generates a weak electrical signal proportional to the NO2 concentration. To realize this at low cost, a laser driver and an analysis circuit including a lock-in amplifier and analog-to-digital conversion were developed. We present first results, which proof the functionality of the circuitry compared to a more expensive laboratory setup.
Originalsprache | englisch |
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Titel | Laser Driver and Analysis Circuitry Development for Quartz-Enhanced Photoacoustic Spectroscopy of NO2 for IoT Purpose |
Seiten | 1-5 |
Band | 2 |
Auflage | 13 |
DOIs | |
Publikationsstatus | Veröffentlicht - 22 Nov. 2018 |
Publikationsreihe
Name | Proceedings |
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Herausgeber (Verlag) | MDPI AG |
ISSN (Print) | 2504-3900 |
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Laser Driver and Analysis Circuitry Development for Quartz-Enhanced Photoacoustic Spectroscopy of NO2 for IoT Purpose
Alexander Kerschhofer (Redner/in), Philipp Breitegger (Redner/in) & Alexander Bergmann (Beitragende/r)
10 Sept. 2018Aktivität: Vortrag oder Präsentation › Posterpräsentation › Science to science