[특허]Magnetically coupled, high resolution linear position sensor for use in high temperature, high pressure environment

Magnetically coupled, high resolution linear position sensor for use in high temperature, high pressure environment 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01R-025/06 G01R-027/02
출원번호	US-0425224 (2012-03-20)
등록번호	US-9250277 (2016-02-02)
발명자 / 주소	Mulhern, Mark D. Maurio, Joseph M.
출원인 / 주소	Northrop Grumman Systems Corporation
대리인 / 주소	Marsteller & Associates, P.C.
인용정보	피인용 횟수 : 0 인용 특허 : 28

초록 ▼

A high resolution, high reliability, magnetically coupled, linear position sensor (50) provides a means of determining the position of an object (51) using a methodology that does not require a direct mechanical or physical connection between the sensor (50) and the object (53) whose position is to be determined. The sensor (50) can operate in a high temperature, high pressure fluid with exposure to moderate levels of radioactivity. The sensor (50) utilizes dual rod elements with a magnetically coupled bridging contact slider (51) supported by a ceramic guide all of which are contained within a non magnetic pressure housing. The topology of the sensor (50) supports at least two types of measurement techniques, Time Domain Reflectometry (TDR) as well as linear resistive to determine target (51) position.

대표청구항 ▼

1. A system for implementing a high resolution, high reliability, magnetically coupled, linear position sensor system, the system comprising: a sensor that utilizes a ratiometric measuring scheme for providing built-in temperature compensation;the sensor having a sensor topology that supports measurement techniques including time domain reflectometry and linear resistive measurements;the sensor including a sensor architecture for enabling the sensor system to use more than one type of input and response to measure position;the sensor formed having a sensor geometry including a plurality of conductive rod shaped resistive elements with at least two rod shaped resistive elements arranged essentially parallel to one another supported by a ceramic guide within a structural housing; one of the two rod shaved resistive elements is formed from a low electrical impedance (conductive) material and a second of the two rod shaped resistive elements is formed from a substantially higher impedance (resistive) material;a slider element forming a bridging contact mechanism of the sensor having at least one moving part having high reliability to easily operate within a harsh environment using selected materials appropriate for a desired operating environment to construct the electro-mechanical elements of the sensor; said at least one moving part of the sensor is spherical shaped and provides a precise line of contact across two rod shaped resistive elements; and,the sliding element being magnetically coupled to an object being tracked;whereby the sensor provides a non-contact sensing ability for determining position of the object being tracked. 2. The invention of claim 1 wherein said sensor has a single moving part. 3. The invention of claim 1 wherein the housing, and said sensor being adapted for a high temperature and high pressure environment. 4. A method of using the sensor according to claim 1 for defining and implementing a high resolution, high reliability, magnetically coupled, linear position sensor system, comprising the steps of: receiving a magnetic field in a conductive and magnetically susceptible spherically shaped contact slider where said magnetic field is emanating from an embedded magnet on a target control rod;synchronizing the movements of the control rod with the spherically shaped contact slider via said magnetic field to produce a sensor where the position of said spherically shaped contact slider is reproducibly and consistently coupled to positions of said target control rod;maintaining constant relative position between the target control rod and the spherically shaped contact slider without direct mechanical connection between the spherically shaped contact slider and target control rod;moving the spherically shaped contact slider by means of magnetic coupling to the target control rod in such a way as to maintain positional synchronization between said target control rod and said spherically shaped contact slider;completing a circuit between a set of at least two parallel arranged resistive rod shaped elements with the spherically shaped contact slider where said spherically shaped contact slider makes a physical and electrical connection with said set of resistive rod shaped elements thereby creating a path, or set of paths, resulting in at least one unique electrical signal to be measured corresponding to possible positions of the spherically shaped contact slider; one of two rod shaped resistive elements is formed from a low electrical impedance (conductive) material and a second of the two rod shaped resistive elements is formed from a substantially higher impedance (resistive) material;measuring unique electrical signal(s) as derived from the resulting resistance, or combination of resistances of a set of resistive rod shaped elements, of the completed circuit involving the spherically shaped contact slider and the set of resistive rod shaped elements. 5. The method of claim 4 further including the step of maintaining said positional synchronization of the control rod and the spherically shaped contact slider in a manner that is indifferent to all environmental extremes. 6. The method of claim 4 further including the step of restricting the spherically shaved contact slider to move in constant contact on a set of fixed resistive rod shaped elements, each possessing a distinct linear electrical resistivity. 7. The method of claim 4 further including the step of utilizing a ratiometric measurement technique for sensing position of the target control rod utilizing an exact position of the spherically shaped contact slider and thereby the target control rod as a percent of full traversing range is obtained. 8. The method of claim 4 further including the step of measuring a unique electrical signal as derived from the resulting time domain reflectometry of the completed circuit involving the spherically shaped contact slider and the set of resistive rod shaped elements.

이 특허에 인용된 특허 (28)

Hashemian, Hashem M.; Morton, Gregory W.; Shumaker, Brent D.; Beverly, Danny D.; Sexton, Casey D., Advanced digital control rod position indication system with rod drop monitoring for nuclear power plants.
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Kaye Arthur (Lancashire GB2) Carr Brian (Lancashire GB2) Latham Philip A. (Lancashire GB2), Control apparatus.
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Nakamura, Mitsuharu; Suwazono, Tsukasa; Ui, Yoshikazu; Sosa, Yutaka; Yanase, Goro; Kawagoe, Kazuhiro; Ishizato, Shinichi; Komai, Norimitsu, Control rod position detector.
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Sexton, Casey D.; Beverly, Danny D.; Morton, Gregory W.; Hashemian, Hashem M.; Shumaker, Brent D., Control rod position indication systems and methods for nuclear power plants.
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Boomgaard Dirk J. (Monroeville PA) Neuner James A. (Richland Township ; Allegheny County PA), Digital rod position detector system.
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Feilchenfeld Michal M. (Churchill PA) Geis Charles G. (N. Huntingdon PA), Digital, electromagnetic rod position indicator with precisely controlled transitions between digital states.
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Barrault Michel R. (Fontaine FRX), Electromagnetic delay line incorporated in a position detector for a movable nuclear reactor control rod.
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Rittenbach Otto E. (Monmouth County NJ) Olesch Reinhard G. (Kronberg DEX), Energy wave electronic intruder detection system.
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Russell James T. (Richland WA) Davis Thomas J. (Richland WA), Magnetostrictive non-contacting pressure detection system.
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Krisst ; Raymond J., Magnetostrictive position indicator.
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Ichikawa Toshio,JPX ; Makihara Yoshiaki,JPX ; Imayoshi Syo,JPX, Magnetostrictive wire control rod position detector assembly.
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Huston John T. (Lancaster OH), Maximum/minimum asymmetric rod detection.
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Bailey Douglas S. (Deerfield IL), Method and apparatus for detecting and distinguishing leaks using reflectometry and conductivity tests.
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Kitaura Wataru (Hitachi JPX) Ito Tetsuo (Hitachi JPX), Method and apparatus for detecting the position of a movable object utilizing the magnetostrictive effect to generate ul.
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Gaussa ; Jr. Louis W. (Penn Township PA) Sahasrabudhe Arun P. (West Mifflin PA), Method and system for compensating a rod position indication system for non-linearity.
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Beltz Eric J. (Westerville OH) Carruth Robert C. (Worthington OH) Farlow Stanley K. (Lewis Center OH) Fromholtz ; deceased Eugene L. (late of Pickering OH by Kathleen M. Fromholtz ; executor ), Method and system for indicating the position of control rods of a nuclear reactor.
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Gaussa ; Jr. Louis W. (Penn Township ; Westmoreland County PA) Sahasrabudhe Arun P. (West Mifflin PA), Method and system for magnetic coupling compensating a rod position indication system.
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Dyben Jerry F. (Fort Wayne IN) Wulc Stanley S. (Rydal PA), Method for making a resistive level sensor.
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Kim,Choon Kyung; Kim,Seog Joo; Cheon,Jong Min; Lee,Jong Moo; Kim,Kook Hun; Kwon,Soon Man, Method for recognizing step movement sequence of control rod drive mechanism of nuclear reactor.
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Neuner James A. (Richland Township ; Lebanon County PA) Boomgaard Dirk J. (Monroeville PA) Wilbur Susan A. (Wilkins Township ; Allegheny County PA) Geis Charles G. (N. Huntington PA), Method for temperature compensating a rod position indication system.
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Troxler, Robert Ernest; Dep, Wewage Hiran Linus, Methods, systems, and computer program products for measuring the density of material.
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White Thomas W. (San Jose CA) Kowdley Balasubramanian S. (San Jose CA) Lewis Thomas A. (San Jose CA) Miller Christopher J. (Campbell CA) Tsukida Robert S. (San Jose CA) Wong Andrew S. (Santa Clara CA, Multistage control rod drive uncoupling tool.
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Begin John D., Pickupless magnetostrictive position measurement apparatus.
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Riemer Dietrich E. (Auburn WA), Position sensing system with magnetic coupling.
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Neuner James A. (Richland Township ; Lebanon County PA) Boomgaard Dirk J. (Monroeville PA), Rod position indication system with temperature compensation.
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Ly Khanh T. (San Jose CA), Tool for remotely measuring width of downcomer annulus in boiling water reactor.
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Kuljis Zoran R. (Gramby CT), Ultrasonic method and apparatus for measuring outside diameter and wall thickness of a tube and having temperature compe.
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Jahnke Serge (Paris FRX), Wiring installation above the cover of a nuclear reactor vessel for connection of electric devices.
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Magnetically coupled, high resolution linear position sensor for use in high temperature, high pressure environment 원문보기

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