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Towards low-cost QEPAS sensors for nitrogen dioxide detection.

P Breitegger¹, B Schweighofer¹, H Wegleiter¹

¹Institute of Electrical Measurement and Sensor Systems, Graz University of Technology, 8010 Graz, Austria.

|April 21, 2020

Summary

A new quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor offers accurate, low-cost nitrogen dioxide (NO2) detection. This robust bare fork design overcomes limitations of commercial sensors for environmental monitoring.

Keywords:

Acoustic filters Bare fork quartz-enhanced photoacoustic spectroscopy (QEPAS)Drift stability Environmental conditions NO2 detection Quartz tuning fork

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Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx

Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx

Published on: December 20, 2016

Area of Science:

Environmental Science
Analytical Chemistry
Sensor Technology

Background:

Growing concerns about air pollution's health impacts drive demand for effective nitrogen dioxide (NO2) monitoring.
Existing low-cost sensors struggle with accuracy, stability, and gas cross-sensitivity.
Quartz-enhanced photoacoustic spectroscopy (QEPAS) offers a promising alternative for precise gas detection.

Purpose of the Study:

To develop and present a novel bare fork QEPAS setup for sensitive NO2 detection.
To demonstrate the system's suitability for environmental trace gas analysis.
To overcome the limitations of micro-resonator-based QEPAS systems in varying environmental conditions.

Main Methods:

Utilized a bare fork QEPAS configuration without micro-resonators for NO2 sensing.
Integrated a low-cost temperature and humidity sensor for environmental robustness.
Employed acoustic filters to enhance sensitivity at a continuous flow rate of 200 std cm3/min.

Main Results:

Achieved ppb-level detection of NO2.
Demonstrated a noise-equivalent concentration of 21 ppb NO2 in synthetic air for a 120s measurement time.
The system proved robust and adaptable to changing environmental conditions.

Conclusions:

The bare fork QEPAS setup provides a robust and sensitive method for NO2 detection.
This technology is well-suited for environmental trace gas monitoring, meeting health and safety standards.
The simplified design offers advantages over traditional QEPAS systems using micro-resonators.