Electrostatic voltage sensor.

摘要

An electrostatic voltage sensor which includes a surface acoustic wave propagating medium and transmitting and receiving transducers (2, 3) coupled to the medium. The voltage sensor is provided with a separate voltage collecting member (7) different from the electrode for applying a voltage or electric field, and the voltage abtained in the voltage collecting member is varied by a predetermined frequency for being applied to the electrode so as to detect external voltage by the variation component of the oscillating frequency.