[특허]Microwave recess distance and air-path clearance sensor

[미국특허] Microwave recess distance and air-path clearance sensor 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01R-027/04
출원번호	US-0646577 (1996-05-08)
발명자 / 주소	Grzybowski Richard R. Meltz Gerald
출원인 / 주소	United Technologies Corporation
대리인 / 주소	DePardo
인용정보	피인용 횟수 : 47 인용 특허 : 11

초록 ▼

A machine having protruding elements 26 and an adjacent abradable seal 18, which move relative to each other, an air-path clearance G between the seal 18 and the elements 26 and an element distance D2 between the sensor 10 and the elements 26, is provided with a sensor 10 which is recessed within the seal 18 by a recess distance D. A clearance/thickness circuit 14 provides transmitted and reflected microwave signals 30,32 along a coaxial cable 12 having a characteristic impedance, to the sensor 10, which has an impedance substantially matched to the characteristic impedance of the cable 12. The sensor 10 provides the reflected signal 32 which is indicative of the recess distance D when the elements 26 are not in front of the sensor 10 and is indicative of the blade distance D2 between the sensor 10 and the elements 26 when the elements 26 are in front of the sensor 10. The circuit 14 receives the reflected signal 32 and provides electrical signals indicative of the recess distance D and/or the air-path clearance G. Alternatively, the circuit 14 may provide only the recess distance D. The sensor 10 provides such measurements whether or not the machine is operating.

대표청구항 ▼

[ We claim:] [1.] An air-path clearance sensor for a machine having protruding elements and an adjacent abradable seal, which are movable relative to each other, there being an air-path clearance between the seal and the elements and an element distance between the sensor and the elements, and the sensor being recessed within the seal by a recess distance, comprising:signal processing means, for providing a microwave transmission signal;transmission means, electrically connected to said signal processing means and having a characteristic impedance, for propagating said microwave transmission signal;sensor means, electrically connected to said transmission means, having an impedance substantially matched to said characteristic impedance of said transmission means, for receiving said transmission signal and for providing a reflected microwave signal onto said transmission means indicative of the recess distance when the elements are not in front of said sensor means;said transmission means propagating said reflected microwave signal; andsaid signal processing means comprising means for receiving said reflected microwave signal and for providing an electrical signal indicative of the recess distance.

이 특허에 인용된 특허 (11) 인용/피인용 타임라인 분석

Mossey Paul W. (Greenhills OH), Apparatus and method for optical clearance determination.
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Woolcock Sydney C. (Wells GB2) Brown Edwin G. (Bath GB2), Checking the location of moving parts in a machine.
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Hellgren Gosta (Jungfrusundsvagen 17 170 10 Ekero SW) Wahlsten Gunnar (Vedettvagen 22 A 183 52 Taby SW), Device for indicating changes in the position of an object.
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Wolff George D. (Winter Haven FL) Smith ; Jr. Marshall E. (Eaton Park FL) Ruck George T. (Worthington OH), Method and apparatus for sensing proximity of an object using near-field effects.
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Chivers John W. H. (Duffield GB2), Microwave interferometer.
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Yu Se Puan (Schenectady NY) Glover Gary H. (Schenectady NY), Microwave proximity detector.
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Damon Edward K. (Columbus OH), Microwave proximity sensor.
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Damon Edward K. (Columbus OH), Microwave proximity sensor.
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Baker, Peter D., Proximity sensing.
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Hildebrand James R. (Palm Beach Gardens FL), Single blade proximity probe.
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Thoman David C. (Mishawaka IN) Perkey Russell C. (Mishawaka IN) Eastman James M. (South Bend IN), Turbine blade clearance controller.
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이 특허를 인용한 특허 (47) 인용/피인용 타임라인 분석

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Heyworth, Harold; Roberts, James P., Clearance and wear determination apparatus.
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Suckling, Martin S.; Mansfield, Lee; Webb, Peter D., Clearance determination device.
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Dzieciol, Edward; Szczepanik, Ryszard; Szczepankowski, Andrzej; Karbowiak, Hieronim, Method of a continuous determination of an instantaneous position of an impeller blade tip in a rotor turbine machine.
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Geisheimer,Jonathan L.; Billington,Scott A.; Burgess,David; Hopkins,Glenn, Microstrip patch antenna for high temperature environments.
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Herron, William Lee; Albers, Robert Joseph; Ruiz, Rafael Jose; Dasgupta, Samhita, Multi sensor clearance probe.
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Hazel,Brian Thomas; Darolia,Ramgopal, Non-destructive determination of machining induced surface defects on metal parts.
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Newman, John W., Nondestructive acoustic doppler testing of wind turbine blades from the ground during operation.
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Jonathan Geisheimer ; Gene Greneker ; Scott Billington, Phase-based sensing system.
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Schenck,Robert A., Proximity sensor.
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Evers, Daniel; Ziroff, Andreas, Radial gap measurement on turbines.
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Webster,John R; Razzell,Anthony G; Brown,Philip D, Seal.
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Newman, John W., System and method for ground based inspection of wind turbine blades.
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Newman, John W., System and method for ground based inspection of wind turbine blades.
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[미국특허] Microwave recess distance and air-path clearance sensor 원문보기