Laser Driver and Analysis Circuitry Development for Quartz-Enhanced Photoacoustic Spectroscopy of NO2 for IoT Purpose

Alexander Kerschhofer, Philipp Breitegger, Alexander Bergmann

Publikation: Beitrag in Buch/Bericht/KonferenzbandBeitrag in einem KonferenzbandForschungBegutachtung

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.
Originalspracheenglisch
TitelLaser Driver and Analysis Circuitry Development for Quartz-Enhanced Photoacoustic Spectroscopy of NO2 for IoT Purpose
Seiten1-5
Band2
Auflage13
DOIs
PublikationsstatusVeröffentlicht - 22 Nov 2018

Publikationsreihe

NameProceedings
Herausgeber (Verlag)MDPI AG
ISSN (Print)2504-3900

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photoacoustic spectroscopy
quartz
lasers
air pollution
forks
air quality
acoustics
sensors
contaminants
amplifiers
semiconductor lasers
tuning
analogs
costs
causes
wavelengths
molecules

Schlagwörter

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    Kerschhofer, A., Breitegger, P., & Bergmann, A. (2018). Laser Driver and Analysis Circuitry Development for Quartz-Enhanced Photoacoustic Spectroscopy of NO2 for IoT Purpose. in Laser Driver and Analysis Circuitry Development for Quartz-Enhanced Photoacoustic Spectroscopy of NO2 for IoT Purpose (13 Aufl., Band 2, S. 1-5). (Proceedings). https://doi.org/10.3390/proceedings2131062

    Laser Driver and Analysis Circuitry Development for Quartz-Enhanced Photoacoustic Spectroscopy of NO2 for IoT Purpose. / Kerschhofer, Alexander; Breitegger, Philipp; Bergmann, Alexander.

    Laser Driver and Analysis Circuitry Development for Quartz-Enhanced Photoacoustic Spectroscopy of NO2 for IoT Purpose. Band 2 13. Aufl. 2018. S. 1-5 (Proceedings).

    Publikation: Beitrag in Buch/Bericht/KonferenzbandBeitrag in einem KonferenzbandForschungBegutachtung

    Kerschhofer, A, Breitegger, P & Bergmann, A 2018, Laser Driver and Analysis Circuitry Development for Quartz-Enhanced Photoacoustic Spectroscopy of NO2 for IoT Purpose. in Laser Driver and Analysis Circuitry Development for Quartz-Enhanced Photoacoustic Spectroscopy of NO2 for IoT Purpose. 13 Aufl., Bd. 2, Proceedings, S. 1-5. https://doi.org/10.3390/proceedings2131062
    Kerschhofer A, Breitegger P, Bergmann A. Laser Driver and Analysis Circuitry Development for Quartz-Enhanced Photoacoustic Spectroscopy of NO2 for IoT Purpose. in Laser Driver and Analysis Circuitry Development for Quartz-Enhanced Photoacoustic Spectroscopy of NO2 for IoT Purpose. 13 Aufl. Band 2. 2018. S. 1-5. (Proceedings). https://doi.org/10.3390/proceedings2131062
    Kerschhofer, Alexander ; Breitegger, Philipp ; Bergmann, Alexander. / Laser Driver and Analysis Circuitry Development for Quartz-Enhanced Photoacoustic Spectroscopy of NO2 for IoT Purpose. Laser Driver and Analysis Circuitry Development for Quartz-Enhanced Photoacoustic Spectroscopy of NO2 for IoT Purpose. Band 2 13. Aufl. 2018. S. 1-5 (Proceedings).
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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.",
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