Publication Details |
| Category | Text Publication |
| Reference Category | Journals |
| DOI | 10.3390/s121217058 |
| Title (Primary) | Improved membrane-based sensor network for reliable gas monitoring in the subsurface |
| Author | Lazik, D.; Ebert, S. |
| Source Titel | Sensors |
| Year | 2012 |
| Department | BOPHY |
| Volume | 12 |
| Issue | 12 |
| Page From | 17058 |
| Page To | 17073 |
| Language | 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. |
| Persistent UFZ Identifier | 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 |
|