Adams & Wilks
Electrostatic sensor
 An electrostatic sensor comprises a ground electrode defining an enclosure having a through-hole for permitting the passage of a body therethrough. A sensor electrode is disposed in the ground electrode. A detecting circuit is disposed in the ground electrode for detecting the passage of the body through the through-hole on the basis of a change in an electrostatic capacitance between the ground electrode and the sensor electrode. 
SEIKO Precision Inc.
G
G01V
inventional
Osamu Hitoshi
Takano Ito