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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0612918 (1975-09-12) |
발명자 / 주소 |
|
출원인 / 주소 |
|
인용정보 | 피인용 횟수 : 9 인용 특허 : 0 |
A quasi-stationary electric field is produced by means of an oscillator whose output is connected to a field wire which is positioned within the area to be protected and the electric field is detected by an antenna whose output is connected to an amplifier. An AM detector is connected to the output
An intrusion warning system for indicating the presence of an intruder iN a given area comprising in combination: means for producing a quasi-stationary electric field within said area including a field wire insulated from ground and an oscillator circuit having its output connected to said field wi
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