Accuracy of a Point Source Thermal Soil Moisture Sensor for Space Flight Nutrient Delivery Systems 2004-01-2456
The WONDER space flight experiment will compare the operation of both substrate-based and porous tube nutrient delivery systems (NDS) under microgravity conditions. Each NDS will be evaluated with three moisture availability regimes, and moisture sensing will be critical for the operation and evaluation of the systems. Orbital Technologies (Madison, WI) has developed a space flight-rated temperature and moisture acquisition system (TMAS) for measuring water content of plant growth medium. The sensors were evaluated in 0.25-1 mm and 1-2 mm baked ceramic aggregate (Profile and Turface, respectively). The sensors' pooled standard deviations ranged from approximately 2% to 5% relative water content (RWC), and root mean square error between sensor RWC and measured RWC was greater than 3% using linear calibration.
Citation: Prenger, J., Steinberg, S., Haddock, D., Norikane, J. et al., "Accuracy of a Point Source Thermal Soil Moisture Sensor for Space Flight Nutrient Delivery Systems," SAE Technical Paper 2004-01-2456, 2004, https://doi.org/10.4271/2004-01-2456. Download Citation
Jessica J. Prenger, Susan L. Steinberg, Daniel Haddock, Joey H. Norikane, Howard G. Levine
Dynamac Corporation, Space Life Sciences Lab, Kennedy Space Center, University Space Research Association, Johnson Space Center, Department of Biosystems and Agricultural Engineering, University of Kentucky, NASA Biological Sciences Office, Kennedy Space Center
International Conference On Environmental Systems