[특허]Capacitive liquid level sensor having phase detecting circuitry

Capacitive liquid level sensor having phase detecting circuitry 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01F-023/26
출원번호	US-0144131 (1993-10-27)
발명자 / 주소	Shillady Robert W. (N. Wales PA)
출원인 / 주소	KDI/Triangle Electronics, Inc. (Cincinnati OH 02)
인용정보	피인용 횟수 : 38 인용 특허 : 0

초록 ▼

A capacitive liquid level sensor having phase detecting circuitry incorporates a capacitive sensor array, an oscillator generating an input signal, a switching circuit sequentially coupling the input signal to the input plates of the capacitive sensor, one at a time, a pair of phase lock loop circuits (PLLs) each having voltage controlled oscillators (VCOs), a second switching circuit selectively coupling the output plates of the capacitive sensor array, in sequential fashion, to the PLLs, and an exclusive OR-gate (XOR) receiving the outputs of the VCOs from each of the PLLs. The XOR generates a first logic level signal when a difference in the phase of two signals from any two adjacent output plates indicates that a phase difference is present. A second logic signal is generated if no phase difference is detected. The signals are perfectly in phase when any two adjacent output plates are either submerged in fluid or both disposed in air. The phases of the output signals differ, however, when the two adjacent output plates are such that one is submerged in fluid while the other is at least partially disposed in air. Signal conditioning means including a pair of D flip flops and a resistive ladder coupled through a switching network provide an output signal to an optional display device for indicating a corresponding fluid level within a fluid reservoir within which the capacitive sensor array is disposed. In an alternative embodiment an integrator is included for determining the composition of the fluid being sensed.

대표청구항 ▼

A liquid level sensor having a capacitive sensor array, wherein said capacitive sensor array is adapted to be disposed in a fluid reservoir along an axis of measurement of fluid contained within said reservoir, and wherein said capacitive sensor array includes a plurality of discrete capacitive input elements and a plurality of discrete capacitive output elements positioned along a length of said array along said axis of measurement, said elements further being positioned such that each one of said input elements overlaps portions of two adjacent ones of said output elements, said apparatus comprising: means for applying an oscillating input signal to at least one said input element of said sensor array at a time, to thereby generate output signals from a corresponding pair of said output elements overlapping said one input element; at least one switch coupled to said output elements and to first and second phase detecting means for controllably coupling said output elements to said first and second phase detecting means; said first phase detecting means being responsive to an output signal from a first one of said corresponding pair of output elements for generating a first frequency signal indicative of one of the presence and absence of said fluid at said first one of said pair of output elements; said second phase detecting means being responsive to an output signal from a second one of said corresponding pair of capacitive output elements for generating a second frequency signal indicative of one of the presence or absence of said fluid at said second one of said pair of output elements; phase comparing means for comparing the phase of said first frequency signal with the phase of said second frequency signal and for generating a first output signal indicative of the presence of a phase difference between said first and second frequency signals and a second output signal indicative of no phase difference between said first and second frequency signals; said first output signal further indicating that said fluid is at least partially absent at one of said corresponding pair of output elements while fluid is present at the other one of said corresponding pair of output elements; and said second output signal further indicating that said fluid is present at both of said first and second capacitive elements.

이 특허를 인용한 특허 (38)

Few Jeffrey P., Apparatus for changing transmission fluid in accordance with a selected condition and method of changing using same.
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Schoenmakers, Kees; Slezak, Jan, Capacitive level sensor with a plurality of segments comprising each a capacitor and a circuit.
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Woodard,Stanley E.; Taylor,Bryant D., Flexible framework for capacitive sensing.
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Hannan Alan R. ; Nickolin Thomas M. ; McQuitty Bryan H. ; Atkinson William E. ; Noble J. Jacob, Liquid level point switch sensor.
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Krufka,Frank S.; Joseph,Joson Kunnumpuram; Lewis,Arnold Lloyd, Method and apparatus for capacitively determining the uppermost level of a liquid in a container.
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Harazin, Richard Raymond; Zweifel, Ronald Alvin, Method and apparatus for sensing a liquid level.
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Pascal Coudray FR; Marie-Helene Froger FR, Method and device for determining the quantity of product present in a reservoir, a product reservoir and a device for processing electrical signals intended for such a determination device.
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Klemp, Heinz, Method for measuring level and level sensor.
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Stanley, James G.; Stopper, Jr., Robert A., Occupant detection system.
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Stambaugh, Deron; Burleson, Mark; Russo, Anthony, On-line fluid sensor.
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Stambaugh, Deron; Burleson, Mark; Russo, Anthony, On-line fluid sensor.
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Zielinski,Michael R.; Taylor,Michael Jon, Proximity sensor for level sensing.
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Capano, David, Scanning capacitive array sensor and method.
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Calabrese, Ronald V., Self-calibrating liquid level transmitter.
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Calabrese,Ronald V., Self-calibrating liquid level transmitter.
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Calabrese,Ronald V., Self-calibrating liquid level transmitter.
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Woodard,Stanley E.; Taylor,Bryant D., System and method for wirelessly determining fluid volume.
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Taylor,Bryant D.; Woodard,Stanley E., Wireless fluid level measuring system.
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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

Capacitive liquid level sensor having phase detecting circuitry 원문보기

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Capacitive liquid level sensor having phase detecting circuitry 원문보기

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이 특허를 인용한 특허 (38)

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