Title :
A measurement method of grounding impedance of a tree
Author :
Yamaura, Itsuo ; Yajima, Masao ; Tanaka, Kyoko ; Fukuma, Hitoshi
Author_Institution :
Fac. of Textile Sci. & Technol., Shinshu Univ., Nagano, Japan
Abstract :
This paper describes a method for measuring the grounding impedance of a tree. Electrode impedance of an electrode using for connection between the measurement circuit and the tree, brings serious error in the measurement. To avoid the effect of the electrode impedance, the four-electrode method known in the impedance measurement methodology, is newly introduced. The hybrid method of the four-electrode method and usual grounding impedance measurement method makes it possible to measure grounding impedance of the tree directly. The experiments of the measurement were conveyed for three materials, zelkova tree, cherry tree, and silk-tree with the girth of 1.7-2.0 meters. Obtained values of impedance were 60-100 O in absolute one, and they showed slight capacitive reactance. It is concluded that the presented method is available for the measurement of grounding impedance of the tree
Keywords :
biological techniques; botany; electric impedance measurement; electrodes; 1.7 to 2 m; capacitive reactance; cherry tree; electrode impedance; equivalent circuit; error; four-electrode method; grounding impedance; grounding impedance measurement; hybrid method; impedance measurement; silk-tree; tree; zelkova tree; Circuits; Conducting materials; Current measurement; Electrodes; Grounding; Impedance measurement; Oscillators; Textiles; Voltage measurement; Zirconium;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 2000. IMTC 2000. Proceedings of the 17th IEEE
Conference_Location :
Baltimore, MD
Print_ISBN :
0-7803-5890-2
DOI :
10.1109/IMTC.2000.848662
