IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
|
| 국제특허분류(IPC7판) |
|
| 출원번호 |
UP-0696215
(2003-10-28)
|
| 등록번호 |
US-7554324
(2009-07-09)
|
|
발명자
/ 주소 |
|
| 출원인 / 주소 |
- Honeywell International Inc.
|
| 대리인 / 주소 |
Ingrassia Fisher & Lorenz, P.C.
|
| 인용정보 |
피인용 횟수 :
20 인용 특허 :
26 |
초록
▼
A proximity sensor system uses a sensor coil as the frequency determining element of an oscillator circuit. The frequency of the oscillator circuit is thus modulated based on the proximity of the sensor coil to a conductive element, thereby supplying a frequency modulated sensor signal. A frequency
A proximity sensor system uses a sensor coil as the frequency determining element of an oscillator circuit. The frequency of the oscillator circuit is thus modulated based on the proximity of the sensor coil to a conductive element, thereby supplying a frequency modulated sensor signal. A frequency modulation (FM) detector circuit demodulates the sensor signal, and supplies a signal having an amplitude that varies with, and is representative of, the proximity of the sensor coil to the conductive element.
대표청구항
▼
I claim: 1. A turbine blade proximity control system for controlling proximity of each of a plurality of turbine blades to a non-rotating turbine component, comprising: a sensor coil; an oscillator circuit including one or more capacitance circuit elements electrically coupled in parallel with the
I claim: 1. A turbine blade proximity control system for controlling proximity of each of a plurality of turbine blades to a non-rotating turbine component, comprising: a sensor coil; an oscillator circuit including one or more capacitance circuit elements electrically coupled in parallel with the sensor coil to thereby form a parallel-resonant LC tank circuit having a resonant frequency that varies with the proximity of the sensor coil to each of the turbine blades, the oscillator circuit operable to generate and supply a sensor signal having a frequency that varies based on the resonant frequency of the parallel-resonant LC tank circuit, whereby the sensor signal is a frequency modulated sensor signal; a frequency modulation (FM) demodulator adapted to receive the frequency modulated sensor signal and operable, in response thereto, to supply a proximity signal having an amplitude that varies with, and is representative of, the proximity of each of the turbine blades to the non-rotating turbine component; and a controller coupled to receive the proximity signal from the frequency modulation demodulator and operable, in response thereto, to control the proximity of the turbine blades to the non-rotating turbine component. 2. The system of claim 1, wherein: the non-rotating turbine component is either a turbine case or a component coupled to the turbine shroud; and the controller controls the proximity of the turbine blades to the non-rotating turbine component by controlling turbine shroud temperature. 3. The system of claim 2, wherein the controller, in response to the proximity signal, supplies one or more valve control signals, and wherein the system further comprises: one or more valves in fluid communication between a cooling air source and the turbine shroud, each valve having an actuator coupled to receive one or more of the valve control signals and operable, in response thereto, to selectively move its associated valve between an open position and a closed position, to thereby selectively cool the turbine case. 4. The system of claim 1, further comprising: a display coupled to receive the proximity signal from the FM demodulator and operable, in response thereto, to supply a visual display of the proximity of each of the turbine blades to the turbine shroud. 5. The system of claim 1, further comprising: a coaxial cable coupled between the sensor coil and the oscillator circuit, the coaxial cable having a capacitance that acts as at least one of the capacitance circuit elements. 6. The system of claim 1, wherein the sensor coil comprises: a ceramic core; and a conductor selected from the group consisting of platinum and molybdenum. 7. The system of claim 1, further comprising: a peak detector coupled to receive the proximity signal and operable, in response thereto, to determine a peak value of the proximity signal. 8. A gas turbine engine, comprising: a turbine case; a turbine wheel rotationally mounted within the turbine case; a plurality of turbine blades extending from the turbine wheel toward the turbine case; and a turbine blade proximity sensor system including: a sensor coil disposed at least partially within the turbine case, an oscillator circuit including one or more capacitance circuit elements electrically coupled in parallel with the sensor coil to thereby form a parallel-resonant LC tank circuit having a resonant frequency that varies with the proximity of the sensor coil to each of the turbine blades, the oscillator circuit operable to generate and supply a sensor signal having a frequency that varies based on the resonant frequency of the parallel-resonant LC tank circuit, whereby the sensor signal is a frequency modulated sensor signal, a frequency modulation (FM) demodulator coupled to receive the frequency modulated sensor signal and operable, in response thereto, to supply a proximity signal having an amplitude that varies with, and is representative of, the proximity of each of the turbine blades to either the turbine case or one or more components mounted thereto, and a controller coupled to receive the proximity signal from the frequency modulation demodulator and operable, in response thereto, to control the proximity of each of the turbine blades to either the turbine case or one or more components mounted thereto.
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