[특허]Proximity sensing system and inductance measuring technique

Proximity sensing system and inductance measuring technique 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01R-027/26
출원번호	US-0002968 (1979-01-12)
발명자 / 주소	Little William R. (Seattle WA)
출원인 / 주소	Eldec Corporation (Lynnwood WA 02)
인용정보	피인용 횟수 : 26 인용 특허 : 0

초록 ▼

A proximity sensing system including an improved variable inductance measuring technique to provide an indication of the proximity of a target object to a remote sensor unit 10 which includes a sensor inductor. A variable inductance measuring apparatus measures the inductance of the sensor inductor, which inductance corresponds to the proximity of a target object. The variable inductance measuring network includes a sensor current pulse generator 20 which, in each of successive system periods, establishes a time-varying current through the sensor unit 10. A sensor control loop stage 30 senses when the resulting sensor voltage reaches a predetermined level and then captures the sensor current so as to clamp the sensor voltage at this level. A retrieval stage 40 then determines the rate of change of the sensor current at the time the sensor current is zero, establishing a calibrated analog voltage of the inductance of the sensor inductor which is substantially temperature independent. The inductance analog voltage is applied to a proximity detection and switching stage 50 which provides a quantized target-near detection pulse if the inductance analog voltage corresponds to a threshold proximity of the target object. Integration over successive system periods then provides a time-average proximity voltage which is applied to a Schmitt trigger and proximity switching network 58, the output of which indicates the proximity of the target object to the sensor inductor with respect to a threshold actuation gap.

대표청구항 ▼

A method for monitoring the proximity of a target object to a sensor unit wherein the sensor unit includes a sensor inductor whose inductance LS varies in a known relationship with the proximity of the target object, the sensor unit also having a temperature-dependent or otherwise variable equivalent resistance in series with said inductance LS and a temperature-dependent or otherwise variable equivalent capacitance in shunt with said inductance LS, comprising the steps of: periodically establishing, during each of successive system periods TS, a current iS through the sensor unit, and thereby through the sensor inductor, said sensor current having a time-variable waveform; and, for each such system period TS, thereafter constraining the voltage vS across the sensor unit to be constant when said sensor voltage reaches a reference voltage VL, whereby the effect of the equivalent capacitance is cancelled; while so constraining said sensor voltage to be constant, determining the rate of change of said sensor current with respect to time when said sensor current is zero, whereby the effect of the equivalent resistance is cancelled; establishing an indication of the inductance LS when said sensor current is zero in accordance with the relationship [Figure] and, providing a target proximity indication representative of the proximity of the target object to the sensor unit in accordance with a known relationship between the proximity of the target object and the inductance LS.

이 특허를 인용한 특허 (26)

Lindgren, Ulf; Bjork, Christian, Apparatus and method of detecting proximity inductively.
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Baranski Jan (Nedlands AUX), Capacitance sensor arrangement.
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Rodenbeck, Robert W.; Burke, David M.; Sawaski, Joel D., Capacitive coupling arrangement for a faucet.
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Rodenbeck, Robert W; Burke, David M; Sawaski, Joel D, Capacitive coupling arrangement for a faucet.
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Charton Ren (Garbsen DEX) Kleen Berend (Hanover DEX), Circuit arrangement for sensing the displacement of a movable iron core relative to a magnetic coil by measuring the dec.
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Tuszyski Alfons A. (Burnsville MN), Circuit for high impedance broad band probe.
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Murai Wasaburo (Osaka JPX), Contact device for a switch.
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Denk Heimo (Feldbach ATX) Mantsch Peter (Graz ATX) Moser Werner (Graz ATX), Device for generating an electric trigger pulse.
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Burreson Bernard J. (Seattle WA), Inductance divider sensor.
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Hofmann, Andreas; Krühler, Matthias, Inductive safety sensor for monitoring doors and gates.
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Baudendistel, Thomas A.; Morelli, Donald T.; Heaston, Bruce; Cyran, Curtis; Foust, Jeff A., Methods for determining inductance and resistance of an inductor.
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Rieckmann,Norbert, Monitoring circuit for a door.
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Baranski Jan (Perth AUX), Proximity measurement by inductive sensing using single turn UHF energized coil sensors incorporated into cutter head of.
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Maier,Lawrence Carl, Proximity sensor interface.
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Lumbab, Alex C., Proximity sensor interface device and method for its use.
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Crudden Eric H. (Mercer Island WA) Kay John (Kirkland WA), Proximity sensor with automatic gap control.
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Lilie, Dietmar Erich Bernhard; Starke, Orlando; Feldmann, Alberto Bruno; Wollrath, Ingwald; Ferreira, Nerian Fernando, Proximity-sensor support, a compressor, a valve plate and a cooler.
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Forster, Ian J.; Horrell, Peter Robert George; Puleston, David J., Self-check for a detector detecting the proximity of a transportation vessel.
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Wagner, Dietmar; Seitz, Armin, Sensor arrangement with a sensor and a signal processing means.
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Stothers, Ian McGregor; McCray, Mark Alan, Sensor core and sensor.
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Slothers, Ian; Langley, Andrew, Signal measurement and processing method and apparatus.
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Petrusan,Mircea Sorin; Sciortino,Michael J., Supply detecting device for money or equivalents.
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Demma, Nick A.; Elgersma, Michael R.; Vetsch, LeRoy E., Systems and method for determining proximity sensor characteristics.
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Rudrich, Hans-Peter, Touch sensor, sanitary fitting with touch sensor and method of detecting a touch on an electrically conductive surface.
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Cleveland, Ronald; Wendler, Steve, Trailer cargo detection using ultrasonic transducers.
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Cleveland,Ronald; Wendler,Steve, Trailer cargo detection using ultrasonic transducers.
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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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Proximity sensing system and inductance measuring technique 원문보기

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이 특허를 인용한 특허 (26)

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