GB756466A - Improvements in electrical systems for measuring small distances between relatively movable parts - Google Patents

Improvements in electrical systems for measuring small distances between relatively movable parts

Info

Publication number
GB756466A
GB756466A GB3533053A GB3533053A GB756466A GB 756466 A GB756466 A GB 756466A GB 3533053 A GB3533053 A GB 3533053A GB 3533053 A GB3533053 A GB 3533053A GB 756466 A GB756466 A GB 756466A
Authority
GB
United Kingdom
Prior art keywords
charge
electrode
potentiometer
relatively movable
dec
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
GB3533053A
Inventor
David Wildon Birnstingl
Samuel Lattimore
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co Ltd
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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Priority to GB3533053A priority Critical patent/GB756466A/en
Publication of GB756466A publication Critical patent/GB756466A/en
Expired legal-status Critical Current

Links

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
    • G01B7/14—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring distance or clearance between spaced objects or spaced apertures

Landscapes

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

Abstract

756,466. Electric measuring systems. BRITISH THOMSON-HOUSTON CO., Ltd. Dec. 2, 1954 [Dec. 18, 1953], No. 35330/53. Class 40(1) [Also in Group XL(c)] Apparatus for measuring the clearance between a blade and the casing of a turbine comprises a fixed electrode 14 (Fig. 1) associated with a rotor blade 3 to form a capacitor which is charged by a D.C. source through a high resistance R4 (Fig. 2) so that the charge across the capacitor is effectively constant, and the cyclic variation of capacity produces a corresponding cyclic variation of voltage which is amplified and indicated at M. The electrode 14 is connected to the central core 15 of a cable having an inner shield 17, and an outer shield 18 connected to the casing of the turbine. The A.C. voltage on the probe lead 15 is amplified by valve V1 and fed to a cathode follower V2 with the meter M across the cathode resistor R8, the circuit connections being such that the charging current through R4 is adjustable at potentiometer R5 to compensate for the loss in charge through the grid leak R2, and a further charge is impressed on the electrode from a potentiometer R7 to compensate for the loss in charge by the stray capacities SC1, SC1<SP>1</SP>. SC2 between the probe lead 15 and the shields 17, 18.
GB3533053A 1953-12-18 1953-12-18 Improvements in electrical systems for measuring small distances between relatively movable parts Expired GB756466A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3533053A GB756466A (en) 1953-12-18 1953-12-18 Improvements in electrical systems for measuring small distances between relatively movable parts

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3533053A GB756466A (en) 1953-12-18 1953-12-18 Improvements in electrical systems for measuring small distances between relatively movable parts

Publications (1)

Publication Number Publication Date
GB756466A true GB756466A (en) 1956-09-05

Family

ID=10376509

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3533053A Expired GB756466A (en) 1953-12-18 1953-12-18 Improvements in electrical systems for measuring small distances between relatively movable parts

Country Status (1)

Country Link
GB (1) GB756466A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2164448A (en) * 1984-09-11 1986-03-19 Mtu Muenchen Gmbh Capacitive measuring system for measuring the distance between parts in relative motion
GB2449274A (en) * 2007-05-15 2008-11-19 Thomas William Bach Passive impedance measurer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2164448A (en) * 1984-09-11 1986-03-19 Mtu Muenchen Gmbh Capacitive measuring system for measuring the distance between parts in relative motion
GB2449274A (en) * 2007-05-15 2008-11-19 Thomas William Bach Passive impedance measurer

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