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The sensor measuring stem water content based on SWR (standing wave ratio) principle was presented in this paper. Laboratory and field tests were performed to examine the feasibility of SWR (standing wave ratio) sensor to monitor changes in the moisture storage of the woody parts of trees. To serve as wave guides for the SWR signal, pairs stainless steel rods (50 mm long, 3 mm in diameter, and 30...
The measurement of volume water content in stem based on dielectric constant has been utilizing widely. A study based on SWR (standing wave ratio) technique was presented in this paper. The sensor probe plays an important role in determination of stem water content with a variety of instruments. Therefore, it is critical to study the length of the probe in order to improve the measuring accuracy of...
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