GB2479773A - An inductive sensor for measuring the position of a control rod within a nuclear reactor - Google Patents

An inductive sensor for measuring the position of a control rod within a nuclear reactor Download PDF

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Publication number
GB2479773A
GB2479773A GB1006721A GB201006721A GB2479773A GB 2479773 A GB2479773 A GB 2479773A GB 1006721 A GB1006721 A GB 1006721A GB 201006721 A GB201006721 A GB 201006721A GB 2479773 A GB2479773 A GB 2479773A
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United Kingdom
Prior art keywords
sensor
induction means
resonant circuit
magnitude
resonant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB1006721A
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GB201006721D0 (en
Inventor
Angelo Sigona
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UK Secretary of State for Defence
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UK Secretary of State for Defence
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Filing date
Publication date
Application filed by UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Priority to GB1006721A priority Critical patent/GB2479773A/en
Publication of GB201006721D0 publication Critical patent/GB201006721D0/en
Publication of GB2479773A publication Critical patent/GB2479773A/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/003—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring position, not involving coordinate determination
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
    • G01D5/2006—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
    • G01D5/2006—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils
    • G01D5/202—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils by movable a non-ferromagnetic conductive element
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C17/00—Monitoring; Testing ; Maintaining
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C17/00—Monitoring; Testing ; Maintaining
    • G21C17/10—Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C7/00—Control of nuclear reaction
    • G21C7/06—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section
    • G21C7/08—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section by displacement of solid control elements, e.g. control rods
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

A sensor 1 comprising a variable capacitor 2, an inductor 3, a voltage source 4 and a toroidal transformer 5 connected in series within an electrical circuit 6, which is tuned to be a resonant circuit. The sensor is used to measure the relative movement of the inductor 3 and a metallic member 9 by measuring changes in magnitude of the current in the resonant circuit 6 as the metallic member 9 enters the magnetic field 8 of the inductor 3. The sensor 1 can be used to measure linear and rotational movement. For example, the metallic member 9 may be attached to a control rod within a nuclear reactor, or the metallic member may comprise a rotatable disc (19, Fig 2) attached to the shaft of a pump within a nuclear reactor.

Description

INTELLECTUAL
. .... PROPERTY OFFICE Application No. GB 1006721.3 RTM Date:20 August 2010 The following terms are registered trademarks and should be read as such wherever they occur in this document: Nimonic; Inconel Intellectual Property Office is an operating name of the Patent Office www.ipo.gov.uk "Sensor" This invention relates to sensors.
The means for measuring the position of a control rod within a nudear reactor are hmited by the fact that the measurement needs to be made within the primary water for the nudear reactor.
The conventional method for taking such measurements is to use a metallic probe tube that houses a coil of wire forming an inductive element that forms part of an electrical circuit. The probe tube is positioned such that a metallic leadscrew attached to the control rod moves telescopicay over the probe tube as the control rod is moved in and out of the nuclear reactor. As the leadscrew moves over the probe tube the voltage across the inductor changes because of the magnetic coupling effects. This change in voltage is directly proportional to the movement of the eadscrew and thus the control rod. A problem with using this method is that it is not very accurate; for a coil length of 1 m the accuracy of the measurements is within approximately 2%. A further problem is that the flux density of the field that will be generated around the inductive element is difficult to predict before manufacture. R is common practice, therefore, to have to manufacture a multitude of inductive elements, the one with the best magnetic field in terms of the spread of the flux ultimately being selected for the use.
Another method of measurement is a transformer principle. This also involves a metallic probe tube and a metallic leadscrew, but this probe tube houses a series of transformer windings alternating between primary windings and secondary windings along a core. When in operation a magnetic field is generated between the primary and secondary windings. As the leadscrew moves over the probe tube the magnetic field between the windings is affected such that the voltage generated across the secondary windings changes proportionately to the movement of the leadscrew over the probe tube. This method provides an accuracy of within about 1% over a coil ength of I m. The sensor housed within the probe tube is difficult and expensive to manufacture because of the a'ternation between the windings and the long, thin nature of the sensor core.
It is therefore an object of the invention to provide a means of measuring the position of a control rod within a nuclear reactor that is more accurate and easier and ess expensive to manufacture. This object is achieved by the sensor according to Claim 1.
In sensors according to the invention the accuracy of the measurement of the position of the control rod over a distance of 1 m is within 0.08%. The induction means housed within the containment tube is extremely easy to manufacture and very inexpensive.
The invention will now be described by way of example with reference to the accompanying drawings, in which: Figure 1 is a schematic view of a sensor for linear displacement measurements; Figure 2 is a schematic view of an alternative embodiment of a sensor for speed of rotation measurement.
Referring to Figure 1, a sensor 1 comprises a variable capacitor 2, an inductor 3, a voltage source 4 and a torroidal transformer 5 connected in series within an &ectrical circuit 6.
The inductor 3 is a 2mm copper wire wound around a polyether ether ketone (PEEK) core. The inductor 3 is housed within a containment tube 7 that is made from Nimonic 75. Nimonic 75 has very low magnetic permeability and conductivity so the containment tube 7 has little affect on the magnetic field 8 generated around the inductor 3 when a current flows through it.
A leadscrew 9 is a hoow tube made from stainless steel (DGS MS HAS 4104) that fits around the containment tube 7. Stainless steel (DGS MS HAS 4104) has a very high magnetic permeability and so the leadscrew 9 has an effect on the magnetic field 8 when the leadscrew 9 covers the containment tube 7.
The electrical circuit 6 is tuned to be a resonant circuit by adjusting the variable capacitor 2 when no part of the containment tube 7 is within the leadscrew 9.
When the capacitance of the e'ectrical circuit 6 is such that the e'ectrical circuit 6 is a resonant circuit the magnitude of the current within the electrical circuit 6 is at its maximum.
The leadscrew 9 is connected to a contro' rod within a nudear reactor (not shown) via a control rod connector 10 and thus moves sympatheticay with the control rod. As the control rod moves in the direction of arrow A so does the leadscrew 9. As the leadscrew 9 moves in the direction of arrow A it covers more of the containment tube 7 and the inductor 3. The complex impedance of the e'ectrical circuit 6 decreases proportionately as the leadscrew 9 moves in the direction of arrow A. As the complex impedance decreases the magnitude of the current in the e'ectrical circuit 6 decreases. The degree of the change of magnitude of the current in the electrica' circuit 6 is directly proportional to the decrease of the complex impedance of the electrical circuit 6 and movement of the leadscrew 9 over the containment tube 7 and the inductor 3.
The current in the electrical circuit 6 flows through the primary winding 5a of the torroidal transformer 5, which induces a voltage across the secondary winding 5b of the torroidal transformer 5. The magnitude of the voltage across the secondary winding 5b is directly proportional to the magnitude of the current in the electrical circuit 6. The measure of the change of magnitude of the voltage across the secondary winding 5b is therefore a measure of the movement of the leadscrew 9 over the inductor 3 and the containment tube 7 and thus it s a measure of the movement of the control rod in and out of the nudear reactor.
The measurement of the change of magnitude of the voltage across the secondary winding 5b has been found to provide a measurement of the control rod position within 0.08% accuracy over an inductor 3 length of 1 m, which results in a significant improvement in accuracy over the prior art.
The decrease in magnitude of the current in the electrical circuit 6 and the voltage across the secondary winding 5b occurs because the electrical circuit 6 s tuned to be a resonant circuit when no part of the containment tube 7 is within the leadscrew 9. As the leadscrew 9 moves over the containment tube 7 the complex impedance of the electrical circuit 6 decreases so that the electrical circuit 6 is no onger a resonant circuit.
The sensor I of this embodiment of the invention thus provides an accurate, inexpensive means of measuring the movement of a control rod in and out of a nuclear reactor, which is also simple to manufacture.
n an alternative embodiment of this invention the electrical circuit 6 is tuned to be a resonant circuit by adjusting the variable capacitor 2 when the containment tube 7 is fully within the leadscrew 9 so that the electrical circuit 6 is a resonant circuit. The complex impedance of the electrical circuit 6 increases proportionately as the leadscrew 9 moves in the direction of arrow B. As the complex impedance increases the magnitude of the current in the electrical circuit 6 decreases. The degree of the change of magnitude of the current in the electrical circuit 6 is direcily proportiona' to the increase of the comp'ex impedance of the electrical circuit 6 and movement of the leadscrew 9 over the containment tube 7 and the inductor 3. Therefore by measuring the magnitude of the voltage across the secondary winding 5b a measure of the movement of the leadscrew 9 over the inductor 3 and the containment tube 7, and thus a measure of the movement of the control rod in and out of the nudear reactor, is made.
The sensor I of this embodiment of the invention thus provides an accurate, inexpensive means of measuring the movement of a control rod in and out of a nudear reactor, which is also simple to manufacture.
An alternative embodiment of the invention wi now be described. Referring to Figure 2, a sensor 11 comprises a variable capacitor 12, an inductor 13, a voltage source 14 and a torroidal transformer 15 connected in series within an e'ectrical circuit 16.
The inductor 13 is a 2mm copper wire wound around a PEEK core. The inductor 13 is housed within a containment tube 17 that is made from Nimonic 75.
Nimonic 75 has very low magnetic permeabi'ity and conductivity and so the containment tube 17 has little affect on the magnetic field 18 generated around the inductor 13 when a current flows through it.
A disc 19 is rotable about an axis 20 and has 8 metal slugs 21 made of stainless steel (DGS MS HAS 4104) spaced equidistance around the perimeter of the disc 19. The disc 19 is positioned adjacent to the containment tube 17 so that as the disc 19 rotates about its axis 20 the metal slugs 21 move through the magnetic field 18. Stainless steel (DGS MS HAS 4104) has a very high magnetic permeability and so the meta' slugs 21 have an effect on the magnetic field 18 when the disc 19 is rotated.
The electrical circuit 16 is tuned to be a resonant circuit by adjusting the variable capacitor 12 when the two adjacent metal slugs 21 closest to the inductor 13 and the containment tube 17 are an equal distance from the inductor 13. When the capacitance of the electrica' circuit 16 is such that the electrical circuit 16 is a resonant circuit the magnitude of the current within the electrical drcuit 16 s at its maximum.
The disc 19 is connected to a shaft of a pump within a nudear system (not shown) and thus rotates sympatheticay with the shaft. As the shaft rotates in the direction of arrow C so does the disc 19. As the disc 19 rotates in the direction of arrow C the metal slugs 21 move through the magnetic field 18. The complex impedance of the electrical circuit 16 decreases every time that one of the metal slugs 21 enters the magnetic field 18 and increases every time that one of the metal slugs 21 exits the magnetic field 18. When one of the metal slugs 21 enters the magnetic field 18 the complex impedance of the electrical circuit 16 decreases and the magnitude of the current in the electrical circuit 16 decreases.
As the disc 19 continues to rotate and one of the metal slugs 21 exits the magnetic field 18 the complex impedance of the electrical circuit 16 increases and the magnitude of the current in the electrical circuit 16 returns to its maximum. The equal spacing of the metal slugs 21 about the perimeter of the disc 19 means that the frequency of the changes in magnitude of the current in the electrical circuit 16 caused by the metal slugs 21 entering and exiting the magnetic field 18 provides a measure of the speed of rotation of the disc 19 and thus the shaft of the pump in the nuclear system.
The current in the electrical circuit 16 ows through the primary winding I 5a of the torroidal transformer 15, which induces a voltage across the secondary winding 15b of the torroidal transformer 15. The magnitude of the voltage across the secondary winding 1 5b is directly proportional to the magnitude of the current in the electrical circuit 16. When changes of magnitude of the voltage across the secondary winding I 5b are measured they therefore provide a measure of the changes of magnitude of the current in the electrical circuit 16. The frequency of the changes in the magnitude of the current in the electrical circuit 16 corresponds to the frequency of the changes of the complex impedance of the electrical circuit 16. The measure of the frequency of the changes in the magnitude of the voltage across the secondary winding 1 5b s therefore a measure of the speed of rotation of the disc 19 and thus it is a measure of the speed of rotation of the shaft of the pump within the nudear system.
The decreases in magnitude of the current in the electrical circuit 16 and the voltage across the secondary winding 1 5b occur because the electrical circuit 16 is tuned to be a resonant circuit when the two adjacent metal slugs 21 dosest to the inductor 13 and the containment tube 17 are an equal distance from the inductor 13. When one of the metal slugs 21 enters the magnetic field 18 the complex impedance of the electrical circuit 16 decreases so that the electrical circuit 16 is no longer a resonant circuit.
The sensor 11 of this embodiment of the invention thus provides an accurate, inexpensive means of measuring the speed of rotation of a pump shaft, even at low speeds of rotation.
n an alternative embodiment of this invention the electrical circuit 16 is tuned to be a resonant circuit by adjusting the variable capacitor 12 when the closest of the metal slugs 21 to the inductor 13 and the containment tube 17 is at its closest position to the inductor 13 and the containment tube 17. As the disc 19 rotates in the direction of arrow C the metal slugs 21 move through the magnetic field 18.
The complex impedance of the electrical circuit 16 increases every time that one of the metal slugs 21 exits the magnetic field 18 and decreases every time that one of the metal slugs 21 enters the magnetic field 18. When one of the metal slugs 21 exits the magnetic field 18 the complex impedance of the electrical circuit 16 increases and the magnitude of the current in the electrical circuit 16 decreases. As the disc 19 continues to rotate and one of the metal slugs 21 enters the magnetic field 18 the complex impedance of the electrical circuit 16 decreases and the magnitude of the current in the electrical circuit 16 returns to its maximum. The equal spacing of the metal slugs 21 about the perimeter of the disc 19 means that the frequency of the changes in magnitude of the current in the electrical circuit 16 caused by the metal slugs 21 exiting and entering the magnetic field 18 provides a measure of the speed of rotation of the disc 19 and thus the shaft of the pump in the nuclear system.
The sensor 11 of this embodiment of the invention thus provides an accurate, inexpensive means of measuring the speed of rotation of the shaft of a pump in a nuclear reactor, even at ow speeds of rotation.
In alternative embodiments of this invention the containment tubes 7, 17 are made from Incomell 625. Other low magnetic permeability and ow magnetic conductivity materials could also be used.
Modifications and improvements may be made without departing from the scope of the invention.

Claims (18)

  1. CLAIMS1. A sensor comprising an induction means and a metallic member arranged to be capable of moving relatively to one another, and a voltage source, wherein the induction means and the voltage source form part of an electrical circuit, characterised in that the electrical circuit is a resonant circuit and r&ative movement of the induction means and the metaUic member causes changes in magnitude of current in the resonant circuit such that said changes in magnitude of current provide a measure of the relative movement of the induction means and metaUic member.
  2. 2. A sensor as claimed in Claim 1, wherein the resonant circuit includes a transformer wherein the transformer provides a voltage output that provides a measure of the change of magnitude of current in the resonant circuit.
  3. 3. A sensor as claimed in Claim I or Claim 2, wherein the resonant circuit incorporates a variable capacitor and the capacitance can be vaned to tune the resonant circuit to be resonant.
  4. 4. A sensor as claimed in any of Claims 1 to 3, wherein the metaflic member is a tube and the induction means is a metal coil that can fit within the metallic member.
  5. 5. A sensor as claimed in Claim 4, wherein the induction means is housed within a containment tube that can fit within the metallic member.
  6. 6. A sensor as claimed in Claim 5, wherein the containment tube is one of the materials Nimonic 75 and Incomell 625.
  7. 7. A sensor as claimed in any of Claims ito 6 wherein the resonant circuit is tuned so as to be resonant when no part of the induction means is within the metal'ic member.
  8. 8. A sensor as claimed in a any of Claims ito 7 wherein the resonant circuit is tuned so as to be resonant when the induction means is entirely within the metallic member.
  9. 9. A sensor as claimed in any of Claims 1 to 8, wherein the induction means is attached to a nuclear reactor control rod.
  10. 10. A sensor as claimed in any of Claims 1 to 8, wherein the metal'ic member is attached to a nuclear reactor control rod.
  11. 11. A sensor as claimed in any of Claims 1 to 3, wherein the metal'ic member is a rotatable disc comprising a plurality of metal slugs spaced equally around its perimeter and the induction means is a metal coil that is positioned adjacent to the metallic member such that the rotation of the disc results in movement of the metal slugs relative to the induction means, the relative movement of the metal slugs relative to the induction means causes the changes of magnitude of current in the resonant circuit such that the frequency of the changes of magnitude of current measures the speed of rotation of the rotatable disc.
  12. 12. A sensor as claimed in Claim Ii, wherein the induction means is housed within a containment tube.
  13. 13. A sensor as claimed in Claim 12, wherein the containment tube is one of the materials Nimonic 75 and Incomell 625.
  14. 14. A sensor as claimed in any of Claims 11 to 13 wherein the resonant circuit is tuned to be resonant when the position of the rotatable disc about its axis is such that two adjacent metal slugs closest to the induction means are an equa' distance from the induction means.
  15. 15. A sensor as claimed in any of Claims 11 to 13 wherein the resonant circuit is tuned to be resonant when the position of the rotatable disc about its axis is such that the closest metal slug to the induction means is at its closest position to the induction means.
  16. 16. A sensor as claimed in any of Claims 11 to 15, wherein the rotatable disc is attached to the shaft of a pump within a nuclear system.
  17. 17. A sensor as claimed in any of Claims 1 to 16, wherein the metalhc member is stainless steel.
  18. 18. A sensor as claimed in any of Claims 1 to 17 wherein the induction means is a copper wire wound around a polyether ether ketone core.
GB1006721A 2010-04-22 2010-04-22 An inductive sensor for measuring the position of a control rod within a nuclear reactor Withdrawn GB2479773A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1006721A GB2479773A (en) 2010-04-22 2010-04-22 An inductive sensor for measuring the position of a control rod within a nuclear reactor

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Application Number Priority Date Filing Date Title
GB1006721A GB2479773A (en) 2010-04-22 2010-04-22 An inductive sensor for measuring the position of a control rod within a nuclear reactor

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GB2479773A true GB2479773A (en) 2011-10-26

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150369943A1 (en) * 2014-06-20 2015-12-24 Rolls-Royce Power Engineering Plc Method of optimising the output of a sensor
US20150369632A1 (en) * 2014-06-20 2015-12-24 Rolls-Royce Power Engineering Plc Sensor and optimising method therefor
US20150369584A1 (en) * 2014-06-20 2015-12-24 Rolls-Royce Power Engineering Plc Sensor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5539308A (en) * 1994-01-26 1996-07-23 Matsushita Electric Works, Ltd. Device for measuring rotating speed having a resonent circuit and a reference circuit
US20060261969A1 (en) * 2005-05-17 2006-11-23 Masakazu Takaku Machine tool
US20090252272A1 (en) * 2008-01-09 2009-10-08 Analysis And Measurement Services Corporation Advanced Digital Control Rod Position Indication System with Rod Drop Monitoring for Nuclear Power Plants

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5539308A (en) * 1994-01-26 1996-07-23 Matsushita Electric Works, Ltd. Device for measuring rotating speed having a resonent circuit and a reference circuit
US20060261969A1 (en) * 2005-05-17 2006-11-23 Masakazu Takaku Machine tool
US20090252272A1 (en) * 2008-01-09 2009-10-08 Analysis And Measurement Services Corporation Advanced Digital Control Rod Position Indication System with Rod Drop Monitoring for Nuclear Power Plants

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150369943A1 (en) * 2014-06-20 2015-12-24 Rolls-Royce Power Engineering Plc Method of optimising the output of a sensor
US20150369632A1 (en) * 2014-06-20 2015-12-24 Rolls-Royce Power Engineering Plc Sensor and optimising method therefor
US20150369584A1 (en) * 2014-06-20 2015-12-24 Rolls-Royce Power Engineering Plc Sensor
EP2958109A3 (en) * 2014-06-20 2016-03-16 Rolls-Royce Power Engineering PLC Sensor
US9804286B2 (en) * 2014-06-20 2017-10-31 Rolls-Royce Power Engineering Plc Method of optimising the output of a sensor for indicating the relative location of a mettalic object
US10060763B2 (en) * 2014-06-20 2018-08-28 Rolls-Royce Power Engineering Plc Sensor assembly for measuring the relative position of a control rod connected to a lead screw within a nuclear reactor

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