実効誘電率の変化の簡便な検出法とその応用

抄録

The velocity that an electrical signal transmits through an electric wire depends on the effective permittivity of the space around the wire. Therefore, when the permittivity of the space around the electric wire changes, propagation delay time changes. This change of the propagation delay time can be easily detected by a simple electronic circuit. The method of detecting the change of the effective permittivity around the electric wire is applicable to various sensing technique in any field. Since human body contains much water and the permittivity of water is very large, this method is especially useful to detect the movement of human body, and is applicable to monitoring breathing, pulse-beat, and so on.