[특허]Proximity detector for hard-to-detect materials

[미국특허] Proximity detector for hard-to-detect materials 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G08B-021/00
출원번호	US-0338366 (1999-06-23)
발명자 / 주소	David C. Macke, Sr. Richard A. Livingston Roger D. Chamberlain Jon G. Metcalf
출원인 / 주소	BFCS Technology, Inc.
대리인 / 주소	Bryan Cave LLP
인용정보	피인용 횟수 : 16 인용 특허 : 25

초록 ▼

A proximity detection system for detecting the proximity of conventionally hard-to-detect materials having a complex permittivity and/or a complex permeability is disclosed. The system includes an oscillator for producing an output signal, the oscillator having a transistor with an open and a closed loop gain and a base-emitter junction that rectifies resonant signals at the collector to produce the output signal. The oscillator includes negative feedback including a resistive element coupled to the emitter for reducing the sensitivity of the closed loop gain to variations in the transistor's open loop gain and a capacitive element coupling the resistive element to the collector for stabilizing the frequency of the oscillator. The detection system further includes a sensor coupled to the oscillator for varying the level of the oscillator output signal in response to certain electrical properties of the material. Control means are also included operatively coupled to the oscillator to receive the oscillator output signal and respond to variations of predetermined magnitudes of the amplitudes of the oscillator output signal for detecting the presence or level of the material. The sensor is designed to reposition the polarization orientation of the electric field lines extending therefrom such that the field lines extend a greater distance outwardly from the surface of the sensor.

대표청구항 ▼

1. A proximity detection system for detecting the presence or level of material comprising:an oscillator that produces an output signal, the oscillator comprising a transistor having a base, an emitter and a collector, the transistor having an open and a closed loop gain and a base-emitter junction that rectifies resonant signals at the collector to produce the output signal, the oscillator further comprising negative feedback for reducing the sensitivity of the closed loop gain to variations in the transistor's open loop gain and for stabilizing the frequency of the oscillator; a sensor operatively coupled to the oscillator for varying the level of the oscillator output signal in response to electrical properties of the material; and a controller operatively coupled to the oscillator to receive the oscillator output signal and being responsive to variations of predetermined magnitudes of the amplitudes of the oscillator output signal for detecting the presence or level of the material, wherein the oscillator and the sensor have a merit factor Q, the merit factor Q decreasing as the sensor is placed in proximity to the material and wherein the amplitude of the oscillations of the oscillator will correspondingly diminish as the merit factor Q decreases, and wherein the oscillator output signal indicates the amplitude of the diminished oscillations.

이 특허에 인용된 특허 (25) 인용/피인용 타임라인 분석

Limberg Allen LeRoy, Bandpass phase tracker with hilbert transformation before plural-phase analog-to-digital conversion.
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Butler George N. (4720 NW. 5 La. Boca Raton FL 33431), Battery-operated body capacitance intrusion alarm apparatus.
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Kasai Eiji,JPX, Body sensing device.
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Calvin Noel M. (2683 Buena Vista Berkeley CA 94708), Capacitance proximity sensor.
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Diamond Donald A. (Norcross GA), Capacitor detector device.
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Kowal Leonard (12647 Miller Ave. Saratoga CA 95070), Chrominance subcarrier regeneration network.
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Aidun Rashid K. (Potsdam NY) Koch Frank J. (Ogdensburg NY), Coating thickness measurement gauge.
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Geiger Wolfgang (Greenwood IN), Control system for a capacitive level sensor.
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Ellis ; Christopher Ian Arthur ; Naylor ; Edward Leonard, Device for detecting predetermined foaming conditions in fluids.
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Carr William W. (Phoenix AZ), Eddy current proximeter.
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Tomioka, Hidehiro; Hosoya, Masakatsu; Ueda, Kenji, High frequency oscillation type proximity switch.
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Kasai Eiji,JPX ; Katoh Akinori,JPX ; Inagami Misako,JPX, High frequency type sensing device.
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Burns David W. (Minneapolis MN) Zook J. David (Minneapolis MN), Integrated resonant microbeam sensor and transistor oscillator.
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Scott Bentley N. ; Shortes Samuel R., Method for monitoring the state of microcrystalline change of solid materials.
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McEwan Thomas E., Micropower RF material proximity sensor.
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Seener G. Thomas ; Heffner Joseph H. ; Chamberlain Roger D. ; Macke ; Sr. David C. ; Livingston Richard A., Oil level control system.
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Tamino Shinya (Kusatsu JPX), Oscillator circuit and proximity switch using.
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Wagner William E. (Holland MI) Zachev Ivan (Muskegon MI), Pre-intrusion detection and alarm system.
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Gibb Robert F. (San Diego CA), Proximity detection system and oscillator, and method of using same.
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Ogata Akimitsu (Takatsuki JPX) Onji Norio (Kyoto JPX), Proximity switch.
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Scott Bentley N. ; Shortes Samuel R., RF probe for montoring composition of substances.
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Miller George B. (11621 Kensington Rossmore CA 90720) Denapole Jack K. (Costa Mesa CA), Remotely responsive motion detector.
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Scott Bentley N. (Richardson TX) Shortes Samuel R. (Lewisville TX), System and method for monitoring substances and reactions.
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Philipp Harald, Time domain capacitive field detector.
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Nguyen Phong Thanh, Voltage-controlled oscillator capable of operating at lower power supply voltages.
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이 특허를 인용한 특허 (16) 인용/피인용 타임라인 분석

Gibb,William J.; Smidebush,Michael; Hernandez Guerra,Francisco Miguel, Adaptive proximity sensing.
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Dorrough, David M., Advanced obscured feature detector.
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Van Wiemeersch, John R.; Price, Don D.; Reed, Eric L., Capacitance-based catalytic converter protection systems and configurations.
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Van Wiemeersch, John Robert; Price, Don David; Reed, Eric L., Capacitance-based vehicular component protection systems and configurations.
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Sieh,Philip J.; Stewart,Bradley C.; Steffen,Michael A., Electrical field sensors for detecting fluid presence or level.
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Bernard, Jacques; Brault, Christophe, Learning proximity detector.
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Dorrough, David M., Obscured feature detector.
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Dorrough, David, Obscured feature detector and method.
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Dorrough, David M., Obscured feature detector housing.
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Dorrough, David M., Obscured feature detector with advanced trace properties.
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Dorrough, David M., Obscured feature detector with pattern matching.
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Dorrough, David M., Obscured feature detector with width indication.
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Haffner, Ken; Pretre, Philippe; Fritz, Oliver, Proximity sensor and method for operating a proximity sensor.
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Dorrough, David M., Surface-conforming obscured feature detector.
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Martinez,Robert E.; Cerwin,Stephen A.; Goyen,Todd H., Systems and methods for detection of dielectric change in material and structure.
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Van Wiemeersch, John Robert; Kautz, Richard William; Gardner, Cornel Lewis; Salter, Stuart C.; Reed, Eric L.; Price, Don David, Vehicular charging and protection systems.
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A	생활필수품
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A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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[미국특허] Proximity detector for hard-to-detect materials 원문보기