Evaluation and environmental correction of ambient CO<sub>2</sub> measurements from a low-cost NDIR sensor
Non-dispersive infrared (NDIR) sensors are a low-cost way to observe carbon dioxide concentrations in air, but their specified accuracy and precision are not sufficient for some scientific applications. An initial evaluation of six SenseAir K30 carbon dioxide NDIR sensors in a lab setting showed...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2017-07-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | https://www.atmos-meas-tech.net/10/2383/2017/amt-10-2383-2017.pdf |
| Summary: | Non-dispersive infrared (NDIR) sensors are a low-cost way
to observe carbon dioxide concentrations in air, but their specified
accuracy and precision are not sufficient for some scientific applications.
An initial evaluation of six SenseAir K30 carbon dioxide NDIR sensors in a
lab setting showed that without any calibration or correction, the sensors
have an individual root mean square error (RMSE) between ∼ 5
and 21 parts per million (ppm) compared to a research-grade greenhouse gas
analyzer using cavity enhanced laser absorption spectroscopy. Through
further evaluation, after correcting for environmental variables with
coefficients determined through a multivariate linear regression analysis,
the calculated difference between the each of six individual K30 NDIR
sensors and the higher-precision instrument had an RMSE of between 1.7
and 4.3 ppm for 1 min data. The median RMSE improved from 9.6 for off-the-shelf sensors to 1.9 ppm after correction and calibration, demonstrating
the potential to provide useful information for ambient air monitoring. |
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| ISSN: | 1867-1381 1867-8548 |