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

Alexander Kerschhofer, Philipp Breitegger, Alexander Bergmann

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

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 languageEnglish
Title of host publicationLaser Driver and Analysis Circuitry Development for Quartz-Enhanced Photoacoustic Spectroscopy of NO2 for IoT Purpose
Pages1-5
Volume2
Edition13
DOIs
Publication statusPublished - 22 Nov 2018

Publication series

NameProceedings
PublisherMDPI AG
ISSN (Print)2504-3900

Fingerprint

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

Keywords

  • air pollution
  • dds
  • internet of things
  • laser driver
  • lock in amplifier
  • measurement
  • photoacoustic spectroscopy

Cite this

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 ed., Vol. 2, pp. 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. Vol. 2 13. ed. 2018. p. 1-5 (Proceedings).

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

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 edn, vol. 2, Proceedings, pp. 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 ed. Vol. 2. 2018. p. 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. Vol. 2 13. ed. 2018. pp. 1-5 (Proceedings).
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