Details zur Publikation |
Kategorie | Textpublikation |
Referenztyp | Zeitschriften |
DOI | 10.3390/s121217058 |
Titel (primär) | Improved membrane-based sensor network for reliable gas monitoring in the subsurface |
Autor | Lazik, D.; Ebert, S. |
Quelle | Sensors |
Erscheinungsjahr | 2012 |
Department | BOPHY |
Band/Volume | 12 |
Heft | 12 |
Seite von | 17058 |
Seite bis | 17073 |
Sprache | englisch |
Keywords | gas; monitoring; soil; greenhouse gases; CO2; membrane; sensor |
Abstract | A conceptually improved sensor network to monitor the partial pressure of CO2 in different soil horizons was designed. Consisting of five membrane-based linear sensors (line-sensors) each with 10 m length, the set-up enables us to integrate over the locally fluctuating CO2 concentrations (typically lower 5%vol) up to the meter-scale gaining valuable concentration means with a repetition time of about 1 min. Preparatory tests in the laboratory resulted in a unexpected highly increased accuracy of better than 0.03%vol with respect to the previously published 0.08%vol. Thereby, the statistical uncertainties (standard deviations) of the line-sensors and the reference sensor (nondispersive infrared CO2-sensor) were close to each other. Whereas the uncertainty of the reference increases with the measurement value, the line-sensors show an inverse uncertainty trend resulting in a comparatively enhanced accuracy for concentrations >1%vol. Furthermore, a method for in situ maintenance was developed, enabling a proof of sensor quality and its effective calibration without demounting the line-sensors from the soil which would disturb the established structures and ongoing processes. |
dauerhafte UFZ-Verlinkung | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=13146 |
Lazik, D., Ebert, S. (2012): Improved membrane-based sensor network for reliable gas monitoring in the subsurface Sensors 12 (12), 17058 - 17073 10.3390/s121217058 |