Jpn. J. Appl. Phys. 46 (2007) pp. 1768-1773  |Previous Article| |Next Article|  |Table of Contents|
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Verification of Individual Identification Method Using Bioelectric Potential of Plant during Human Walking

Shigeki Hirobayashi, Yusuke Tamura, Tatsuo Yamabuchi, and Toshio Yoshizawa

(Received October 4, 2006; accepted December 2, 2006; published online April 5, 2007)

In this study, we monitored electromagnetic waves generated by human activity and investigated a method for individual identification by looking at the bioelectric potential of a rubber tree. Four subjects were asked to walk in place at a distance of 60 cm from a rubber tree while we measured variations in the bioelectric potential of the tree as produced by the stepping. The results confirmed that electromagnetic waves generated by a human subject walking in place produce a measurable response in the bioelectric potential of a plant. It was also found that this variation in bioelectric potential varies in synchrony with each subject's walking pace. The spectral envelope of the observed signal was approximated using a straight line and the distribution of the coefficients of this line was plotted. Even for a simple straight-line approximation, we demonstrated that this coefficient distribution varies considerably among individual subjects.

KEYWORDS: plant bioelectric potential, electric field, individual identification, walking, rubber tree, straight-line approximation
URL: http://jjap.ipap.jp/link?JJAP/46/1768/
DOI: 10.1143/JJAP.46.1768

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