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Enhanced Ambient Sensing Environment-A New Method for Calibrating Low-Cost Gas Sensors.

Hugo Savill Russell1,2,3, Louise Bøge Frederickson1,2,3, Szymon Kwiatkowski3

  • 1Department of Environmental Science, Aarhus University, DK-4000 Roskilde, Denmark.

Sensors (Basel, Switzerland)
|October 14, 2022
PubMed
Summary

The Enhanced Ambient Sensing Environment (EASE) method offers a faster, more accurate way to calibrate low-cost gas sensors. This hybrid approach improves upon traditional lab and field methods for environmental monitoring.

Keywords:
calibrationcalibration protocolelectrochemical sensorlow-cost sensorsmetal oxide sensor

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Area of Science:

  • Environmental Science
  • Sensor Technology
  • Analytical Chemistry

Background:

  • Accurate calibration of low-cost gas sensors is crucial but currently time-consuming and difficult.
  • Existing laboratory calibration methods suffer from poor transferability, while field calibration is lengthy.
  • There is a need for efficient and reliable gas sensor calibration techniques.

Purpose of the Study:

  • To introduce and evaluate the Enhanced Ambient Sensing Environment (EASE) method for gas sensor calibration.
  • To compare the EASE method with traditional laboratory and field calibration techniques.
  • To assess the performance of metal-oxide (MOx) and electrochemical (EC) sensors for NO2 and O3 measurement using EASE.

Main Methods:

  • Developed the EASE method, a hybrid calibration technique using a controlled duct with ambient air.
  • Artificially manipulated pollutant levels within the EASE duct to condense calibration time.
  • Calibrated MOx and EC gas sensors for NO2 and O3 (0-120 ppb) in EASE, laboratory, and field settings.

Main Results:

  • EASE calibration outperformed laboratory calibration for both sensor types and gases.
  • EASE calibration performed similarly to or better than field calibration, in a fraction of the time.
  • Electrochemical sensors showed slightly better performance for NO2 and comparable performance for O3, with less variability and greater robustness than MOx sensors.

Conclusions:

  • The EASE method provides a significantly more efficient and effective approach to calibrating low-cost gas sensors.
  • EASE combines the benefits of laboratory and field calibration, offering improved accuracy and reduced time.
  • This method is suitable for calibrating sensors for NO2 and O3, with EC sensors being a robust choice.