proudly sponsored by
|
archiving of SOWACS proudly sponsored by |
|
Steve Evett writes to the sowacs list: ===8<============== Craig and all, The CS616 and the Theta probe are both frequency domain devices, while the TDR100 system is a time domain reflectometry system. The TDR100 captures a wave form from each probe in the system and analyzes it for travel time, which is then used to estimate water content. Alternatively, the wave forms can be stored and analyzed separately. My judgement is that the CS616 works better than the Theta probe. It is certainly more robust. Of the two, the CS616 output is linear with water content, while the Theta probe output is nonlinear with water content. This makes calibration of the CS616 much easier. Both devices should be calibrated for the specific soil in which they are to be used. Steve Evett At 08:03 PM 8/11/2003 +1200, you wrote: >Craig Barton writes to the sowacs list: >===8<============== >Does anyone know the relative merits of the Campbell CS616 and Delta T Theta >probes. Or how either of them compare with the Campbell TDR100 system for >monitoring soil moisture. >Thanks >Craig > >_______________________________________ >Dr Craig Barton >Forest Research and Development Division > State Forests of NSW >PO Box 100 >Beecroft >NSW 2119 >AUSTRALIA > >Phone: + 61 (02) 9872 0199 >Fax: + 61 (02) 9871 6941 > > >===8<============== >NOTE: To get off this list, send an email to list@sowacs.com >with the subject line: >unsubscribe_sowacs > >For full instructions see this page: ><http://www.sowacs.com/subscribe/index.html> Steve Evett, Soil Scientist, Lead Scientist - Crop Water Use and Irrigation Research Team Soil and Water Management Research Unit USDA-ARS, P.O. Drawer 10 (2300 Experiment Station Road), Bushland, Texas 79012 USA 806-356-5775, FAX: 806-356-5750 srevett@cprl.ars.usda.gov, http:/www.cprl.ars.usda.gov/programs/ ===8<============== NOTE: To get off this list, send an email to list@sowacs.com with the subject line: unsubscribe_sowacs For full instructions see this page: <http://www.sowacs.com/subscribe/index.html>