[특허]Ultra-wideband impedance sensor

[미국특허] Ultra-wideband impedance sensor 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01S-013/00
출원번호	US-0031839 (1998-02-27)
발명자 / 주소	McEwan Thomas E.
출원인 / 주소	The Regents of the University of California
대리인 / 주소	Sartorio
인용정보	피인용 횟수 : 49 인용 특허 : 7

초록 ▼

The ultra-wideband impedance sensor (UWBZ sensor, or Z-sensor) is implemented in differential and single-ended configurations. The differential UWBZ sensor employs a sub-nanosecond impulse to determine the balance of an impedance bridge. The bridge is configured as a differential sample-and-hold circuit that has a reference impedance side and an unknown impedance side. The unknown impedance side includes a short transmission line whose impedance is a function of the near proximity of objects. The single-ended UWBZ sensor eliminates the reference side of the bridge and is formed of a sample and hold circuit having a transmission line whose impedance is a function of the near proximity of objects. The sensing range of the transmission line is bounded by the two-way travel time of the impulse, thereby eliminating spurious Doppler modes from large distant objects that would occur in a microwave CW impedance bridge. Thus, the UWBZ sensor is a range-gated proximity sensor. The Z-sensor senses the near proximity of various materials such as metal, plastic, wood, petroleum products, and living tissue. It is much like a capacitance sensor, yet it is impervious to moisture. One broad application area is the general replacement of magnetic sensors, particularly where nonferrous materials need to be sensed. Another broad application area is sensing full/empty levels in tanks, vats and silos, e.g., a full/empty switch in water or petroleum tanks.

대표청구항 ▼

[ The invention claimed is:] [1.] An ultra-wideband impedance (UWBZ) sensor, comprising:a pulse generator for producing ultra-wideband gating pulses;an ultra-wideband sampler connected to the pulse generator which samples during the gating pulses;a transmission line whose impedance is a function of the near proximity of objects, connected to the sampler to produce changes in sampler output caused by changes in impedance of the transmission line caused by the near proximity of objects to the transmission line;an output device connected to the sampler output to provide an output signal;wherein the sensing range is determined by half the pulsewidth of the gating pulses.

이 특허에 인용된 특허 (7) 인용/피인용 타임라인 분석

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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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[미국특허] Ultra-wideband impedance sensor 원문보기