1. Evaluation and enhancement of a low-cost NDIR CO2 sensor.
- Author
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Martin, Cory R., Ning Zeng, Karion, Anna, Dickerson, Russell R., Xinrong Ren, Turpie, Bari N., and Weber, Kristy J.
- Subjects
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CARBON dioxide , *STANDARD deviations , *GREENHOUSE gases - Abstract
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 (RMS) error between ~ 5 to 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 for one minute data a standard deviation of between 1.6 ppm and 4.4 ppm. The median standard deviation improved from 8.08 for off the shelf sensors to 1.89 ppm after correction and calibration, demonstrating the potential to provide useful information for ambient air monitoring. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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