capacitance-operated intrusion detector

capacitance-operated intrusion detector

[kə′pas·ə·təns ¦ȧp·ə‚rād·əd in′trü·zhən di′tek·tər]
(engineering)
A boundary alarm system in which the approach of an intruder to an antenna wire encircling the protected area a few feet above ground changes the antenna-ground capacitance and sets off the alarm.