[특허]Double-driven shield capacitive type proximity sensor

Double-driven shield capacitive type proximity sensor 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G08C-019/10
출원번호	US-0008426 (1993-01-25)
발명자 / 주소	Vranish John M. (Crofton MD)
출원인 / 주소	The United States of America as represented by the Administrater, national Aeronautics & Space Administration (Washington DC 06)
인용정보	피인용 횟수 : 75 인용 특허 : 0

초록 ▼

A capacity type proximity sensor comprised of a capacitance type sensor, a capacitance type reference, and two independent and mutually opposing driven shields respectively adjacent the sensor and reference and which are coupled in an electrical bridge circuit configuration and driven by a single frequency crystal controlled oscillator. The bridge circuit additionally includes a pair of fixed electrical impedance elements which form adjacent arms of the bridge and which comprise either a pair of precision resistances or capacitors. Detection of bridge unbalance provides an indication of the mutual proximity between an object and the sensor. Drift compensation is also utilized to improve performance and thus increase sensor range and sensitivity.

대표청구항 ▼

A double driven shield capacitive type proximity sensor located on a piece of apparatus for detecting the presence of an intruding object within a region of interest in the vicinity of the apparatus, comprising: an outermost sensor element on said piece of apparatus and facing said object; a first shield element for said outermost sensor element located immediately behind said outermost sensor element and between said piece of apparatus; a reference sensor element located immediately adjacent said piece of apparatus and behind said first shield element; a second shield element for said reference sensor element located intermediate said first shield element and said reference sensor element; said outermost sensor element and said first shield element being coupled in parallel in a first arm of a bridge circuit also including first and second pairs of circuit nodes, said reference sensor element and said second shield element being coupled in parallel in a second arm of said bridge circuit, said first and second arms comprising a first pair of mutually adjacent arms of said bridge circuit and being connected at one end to a first node of said first pair of circuit nodes and being connected at their respective other ends to separate nodes of said second pair of circuit nodes, and additionally including first and second electrical impedance elements respectively comprising third and fourth arms of said bridge circuit, said third and fourth arms comprising a second pair of mutually adjacent arms of said bridge circuit and being connected at one end to a second node of said first pair of circuit nodes and being connected at their respective other ends to said separate nodes of said second pair of nodes thereby closing said bridge circuit; a single frequency signal source coupled to said first pair of circuit nodes; and second circuit means coupled to said second pair of circuit nodes for detecting the state of balance of said bridge circuit, thereby providing an indication of intrusion by said object within said region of interest as a function of said state of balance.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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연합인증

Double-driven shield capacitive type proximity sensor 원문보기

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Double-driven shield capacitive type proximity sensor 원문보기

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연구과제 타임라인

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이 특허를 인용한 특허 (75)

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