GB1498407A - Displacement detecting devices - Google Patents

Displacement detecting devices

Info

Publication number
GB1498407A
GB1498407A GB2479874A GB2479874A GB1498407A GB 1498407 A GB1498407 A GB 1498407A GB 2479874 A GB2479874 A GB 2479874A GB 2479874 A GB2479874 A GB 2479874A GB 1498407 A GB1498407 A GB 1498407A
Authority
GB
United Kingdom
Prior art keywords
frequency
clearance
blade
electrodes
inversely proportional
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.)
Expired
Application number
GB2479874A
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.)
Secretary of State for Defence Canada
UK Secretary of State for Defence
Original Assignee
Secretary of State for Defence Canada
UK Secretary of State for Defence
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Secretary of State for Defence Canada, UK Secretary of State for Defence filed Critical Secretary of State for Defence Canada
Priority to GB2479874A priority Critical patent/GB1498407A/en
Publication of GB1498407A publication Critical patent/GB1498407A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G01D5/24—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 capacitance
    • G01D5/241—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 capacitance by relative movement of capacitor electrodes
    • G01D5/2417—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 capacitance by relative movement of capacitor electrodes by varying separation

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

1498407 Measuring displacement electrically DEFENCE SECRETARY OF STATE FOR 6 May 1975 [4 June 1974] 24798/74 Heading G1N The clearance between the tip of a blade of a compressor or turbine and a casing is monitored by means of a capacitive probe 1 forming part of the frequency determining circuit of an oscillator 2. Probe 1 includes a pair of spaced electrodes 3, 4 insulatingly 5 mounted in a screen 6 so that as a blade passes the electrodes the capacitance therebetween is changed in dependance on the clearance between the electrodes and the blade, causing the FET oscillator 2 frequency to deviate by an amount inversely proportional to the clearance. The frequency deviations are detected by means of a mixer 7 and frequency discriminator 9, the output of which is a series of pulses the amplitudes of which are inversely proportional to the clearances and which are fed to an oscilloscope 10 and a display 12 via a peak detector 11.
GB2479874A 1975-05-06 1975-05-06 Displacement detecting devices Expired GB1498407A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2479874A GB1498407A (en) 1975-05-06 1975-05-06 Displacement detecting devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2479874A GB1498407A (en) 1975-05-06 1975-05-06 Displacement detecting devices

Publications (1)

Publication Number Publication Date
GB1498407A true GB1498407A (en) 1978-01-18

Family

ID=10217393

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2479874A Expired GB1498407A (en) 1975-05-06 1975-05-06 Displacement detecting devices

Country Status (1)

Country Link
GB (1) GB1498407A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2479987A1 (en) * 1980-04-03 1981-10-09 Avco Corp SIGNAL TRANSMISSION PROBE FOR TURBINE SPEED DETECTION DEVICE
GB2124386A (en) * 1982-06-26 1984-02-15 Derek Harry Graddon Redman Dynamic measuring system
DE3643095A1 (en) * 1986-12-17 1988-07-07 Mtu Muenchen Gmbh Device for measuring movement
EP0833124A2 (en) * 1996-09-26 1998-04-01 ROLLS-ROYCE plc Capacitive distance measurement

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2479987A1 (en) * 1980-04-03 1981-10-09 Avco Corp SIGNAL TRANSMISSION PROBE FOR TURBINE SPEED DETECTION DEVICE
GB2124386A (en) * 1982-06-26 1984-02-15 Derek Harry Graddon Redman Dynamic measuring system
DE3643095A1 (en) * 1986-12-17 1988-07-07 Mtu Muenchen Gmbh Device for measuring movement
EP0833124A2 (en) * 1996-09-26 1998-04-01 ROLLS-ROYCE plc Capacitive distance measurement
EP0833124A3 (en) * 1996-09-26 1999-04-21 ROLLS-ROYCE plc Capacitive distance measurement
US6054866A (en) * 1996-09-26 2000-04-25 Rolls-Royce Plc Method and apparatus for measuring distance using capacitance characteristic

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee