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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.
Original language | English |
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Title of host publication | Laser Driver and Analysis Circuitry Development for Quartz-Enhanced Photoacoustic Spectroscopy of NO2 for IoT Purpose |
Pages | 1-5 |
Volume | 2 |
Edition | 13 |
DOIs | |
Publication status | Published - 22 Nov 2018 |
Publication series
Name | Proceedings |
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Publisher | MDPI AG |
ISSN (Print) | 2504-3900 |
Keywords
- air pollution
- dds
- internet of things
- laser driver
- lock in amplifier
- measurement
- photoacoustic spectroscopy
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- 1 Poster presentation
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Laser Driver and Analysis Circuitry Development for Quartz-Enhanced Photoacoustic Spectroscopy of NO2 for IoT Purpose
Alexander Kerschhofer (Speaker), Philipp Breitegger (Speaker) & Alexander Bergmann (Contributor)
10 Sept 2018Activity: Talk or presentation › Poster presentation › Science to science