GB665651A - Improved apparatus for indicating and/or measuring variations in thickness or other dimension - Google Patents

Improved apparatus for indicating and/or measuring variations in thickness or other dimension

Info

Publication number
GB665651A
GB665651A GB9104/49A GB910449A GB665651A GB 665651 A GB665651 A GB 665651A GB 9104/49 A GB9104/49 A GB 9104/49A GB 910449 A GB910449 A GB 910449A GB 665651 A GB665651 A GB 665651A
Authority
GB
United Kingdom
Prior art keywords
detector
thickness
inductance
april
gauge
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
GB9104/49A
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.)
E M F ELECTRIC Co PROPRIE
Original Assignee
E M F ELECTRIC Co PROPRIE
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 E M F ELECTRIC Co PROPRIE filed Critical E M F ELECTRIC Co PROPRIE
Publication of GB665651A publication Critical patent/GB665651A/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
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
    • G01B7/10—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance
    • G01B7/105—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance for measuring thickness of coating

Abstract

665,651. Magnetic tests and measurements. E.M.F. ELECTRIC CO. PROPRIETARY, Ltd. April 4, 1949 [April 30, 1948], No. 9104/49. Class 37. Apparatus for measuring variations in thickness or other dimensions comprises an oscillator and detector circuit wherein the inductive component of a tuned network in the detector is modified by the proximity of the object whose variations are to be determined, and means for relatively moving the inductance and the object to restore the output of the detector to a datum value. The inductance L<SP>3</SP> of the tuned detector, held at the end of a hinged rod 7, is located near two V-blocks 8 in which are placed the object 9, e.g. an electrode with metal. core and a flux covering, the distance between the coil L<SP>3</SP> and the V-blocks 8 being adjustable by rotating a cam wheel 10 on which the rod 7 rests, a gauge 12 giving the extent of travel of the coil L<SP>3</SP>. The maximum and minimum thicknesses of covering are thus located, and the difference determined from gauge 12.
GB9104/49A 1948-04-30 1949-04-04 Improved apparatus for indicating and/or measuring variations in thickness or other dimension Expired GB665651A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU665651X 1948-04-30

Publications (1)

Publication Number Publication Date
GB665651A true GB665651A (en) 1952-01-30

Family

ID=3751055

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9104/49A Expired GB665651A (en) 1948-04-30 1949-04-04 Improved apparatus for indicating and/or measuring variations in thickness or other dimension

Country Status (1)

Country Link
GB (1) GB665651A (en)

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