EMBEDDED SENSOR

摘要

An embedded sensor having an excellent sensing stability without using any high frequency radio wave for generating a magnetic field, comprising a sensing electrode (2) embedded in the ground or the floor of a building and insulated from the ground or the building, a reference electrode (4) embedded in the ground or the floor and insulated from the ground or the floor and from the sensing electrode (2), a flat plate (10) serving as a charging member, a water-repellent layer (12) formed on the body (11) of the flat plate (10), an insulating layer (13) provided on the surface of the embedment portion of the body (11), a residual charge dispersing part (14) provided on the surface of the embedment portion of the body (11), a sensing circuit (20) for sensing the change in the capacitance between the sensing electrode (2) and the reference electrode (3) caused by the existence of an object in the sensing area of the sensor.