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sowacs: soil water moisture content measurement systems and sensors |
Dear Michael ________________________________ Hello all, Michael here, I am a graduate student at the Galway Mayo Institute of I have used Campbell Scientific CS616-L Water Content Reflectometers My questions are: Has anyone used the complete Campbell System to measure soil moisture Thanking you all in advance for any suggestions. Michael Greene,
I want to answer your questions to some extent how I can, I wish it will be usefull.
1. I didn't use campbell system but I have some good sugestions:
The time domain reflectometer is a system wich sends a electromagnetic signal to soil, and however if there isn't any iron or other yonic principles (water dielectric=81) water is the most effective on this signal (water dielectric may change by tempreture amoun 2 or 3 points), when signal recive to water molucols the rise time of signal will clopse and view a decrese about some micro seconds, and it is the point you can find water content by this.
If you need other information feel free about call me.
Morteza Doosti
Irrigation Engineering
From: "michael.h.gre...@gmail.com" <michael.h.gre...@gmail.com>
To: sowacs: soil water moisture content measurement systems and sensors <sowacs@googlegroups.com>
Sent: Tuesday, October 21, 2008 2:39:38 PM
Subject: Experiences with using CS616-L Soil Moisture Content Sensors in Sandy/gravel soil
Technology in Galway, Ireland. I am researching combined heat and
moisture movement in the Irish soils surrounding underground heat
exchangers for heat pumping. I have installed temperature and moisture
sensors in profiles surrounding heat exchager pipes in the ground, to
establish the temperature and volumetric water content gradients near
the pipes.
but I wired them to National Instruments FP-CTR-502 field point
modules which read voltage or current. This poor choice of field point
module was due to a communication error with National Instruments,
with the help of a circuit board supplied by national instruments it
was possible to get this system working however I am not confident of
the data at all and wish to change the set-up. I am thinking of
purchasing some more CS 616-L sensors with the recommended Campbell
data logger this time.
content?
If so;
Are you satisfied with the system?
Are you aware of a better method in existance?
Site specific calibration is important, in brief what method would you
recommend?
What effect does the presence of small stones/ gravel in the vicinity
of the sensor have on the results?
Department of Mechanical and Industrial Engineering,
Galway-Mayo Institute of Technology,
Dublin Rd.,
Galway,
Ireland.
michael.h.gre...@gmail.com