GB575150A - Improvements in or relating to devices for testing the thickness of coatings on ferro-magnetic materials - Google Patents

Improvements in or relating to devices for testing the thickness of coatings on ferro-magnetic materials

Info

Publication number
GB575150A
GB575150A GB1518944A GB1518944A GB575150A GB 575150 A GB575150 A GB 575150A GB 1518944 A GB1518944 A GB 1518944A GB 1518944 A GB1518944 A GB 1518944A GB 575150 A GB575150 A GB 575150A
Authority
GB
United Kingdom
Prior art keywords
magnet
thickness
counterpoise
coatings
testing
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
GB1518944A
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.)
ERIC SPENCER SPENCER TIMMS
Original Assignee
ERIC SPENCER SPENCER TIMMS
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 ERIC SPENCER SPENCER TIMMS filed Critical ERIC SPENCER SPENCER TIMMS
Priority to GB1518944A priority Critical patent/GB575150A/en
Publication of GB575150A publication Critical patent/GB575150A/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

Landscapes

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

Abstract

575,150. Magnetic tests and measurements. TIMMS, E. S. SPENCER-. Aug. 9, 1944, No. 15189. [Class 37] A device for testing the thickness of coatings on ferromagnetic materials, comprises a permanent magnet mounted on the shorter arm of a steelyard balance so that it can be applied to a specimen under test, the longer arm of the balance carrying a movable counterpoise. When the counterpoise 7 is adjusted so that the lower end of the magnet 5 is just detaching itself from the specimen, a measure is obtained of the least force required to detach the magnet and hence of the thickness of the coating at the place where the magnet is applied. The counterpoise may be adjusted by hand, by arranging it to engage with a helical grove 9 cut on the longer arm 3, its position being fixed at any desired place by a pin 8. The reading of the balance is facilitated by the arbitrarily chosen scale 10. Preferably the magnet is rod-shaped and the lower end is hemispherical.
GB1518944A 1944-08-09 1944-08-09 Improvements in or relating to devices for testing the thickness of coatings on ferro-magnetic materials Expired GB575150A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1518944A GB575150A (en) 1944-08-09 1944-08-09 Improvements in or relating to devices for testing the thickness of coatings on ferro-magnetic materials

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1518944A GB575150A (en) 1944-08-09 1944-08-09 Improvements in or relating to devices for testing the thickness of coatings on ferro-magnetic materials

Publications (1)

Publication Number Publication Date
GB575150A true GB575150A (en) 1946-02-05

Family

ID=10054586

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1518944A Expired GB575150A (en) 1944-08-09 1944-08-09 Improvements in or relating to devices for testing the thickness of coatings on ferro-magnetic materials

Country Status (1)

Country Link
GB (1) GB575150A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2571488A (en) * 1949-06-15 1951-10-16 John T Rooney Thickness measuring device
US2670457A (en) * 1952-01-23 1954-02-23 Remington Arms Co Inc Detector for ferrous metal
US2738460A (en) * 1952-08-08 1956-03-13 Sev Engineering Co Inc Permeability standard
US2750561A (en) * 1952-04-25 1956-06-12 Martin R Gross Indicator for low permeability materials
US3013204A (en) * 1958-06-23 1961-12-12 Shell Oil Co Testing apparatus
WO1983001833A1 (en) * 1981-11-12 1983-05-26 Koch, Frank Coatings thickness and surface roughness comparator
US4433290A (en) * 1981-11-12 1984-02-21 Defelsko Corporation Magnetic coating thickness comparator having parallel magnetic rods with nonmagnetic slide indicators
US4733178A (en) * 1982-01-21 1988-03-22 Linda Koch Magnetic thickness gauge with third support
ITTO20100896A1 (en) * 2010-11-10 2012-05-11 Alenia Aeronautica Spa PROCEDURE FOR DETECTING THE THICKNESS OF MANUFACTURED WALLS NON-FERROMAGNETIC MATERIAL CABLES
CN107607595A (en) * 2017-09-21 2018-01-19 京东方科技集团股份有限公司 Optical filter detection means and method

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2571488A (en) * 1949-06-15 1951-10-16 John T Rooney Thickness measuring device
US2670457A (en) * 1952-01-23 1954-02-23 Remington Arms Co Inc Detector for ferrous metal
US2750561A (en) * 1952-04-25 1956-06-12 Martin R Gross Indicator for low permeability materials
US2738460A (en) * 1952-08-08 1956-03-13 Sev Engineering Co Inc Permeability standard
US3013204A (en) * 1958-06-23 1961-12-12 Shell Oil Co Testing apparatus
WO1983001833A1 (en) * 1981-11-12 1983-05-26 Koch, Frank Coatings thickness and surface roughness comparator
US4433290A (en) * 1981-11-12 1984-02-21 Defelsko Corporation Magnetic coating thickness comparator having parallel magnetic rods with nonmagnetic slide indicators
US4733178A (en) * 1982-01-21 1988-03-22 Linda Koch Magnetic thickness gauge with third support
ITTO20100896A1 (en) * 2010-11-10 2012-05-11 Alenia Aeronautica Spa PROCEDURE FOR DETECTING THE THICKNESS OF MANUFACTURED WALLS NON-FERROMAGNETIC MATERIAL CABLES
EP2453201A1 (en) * 2010-11-10 2012-05-16 Alenia Aeronautica S.p.A. Method for detecting the thickness of the walls of hollow manufactured bodies made from non-ferromagnetic material
US8869631B2 (en) 2010-11-10 2014-10-28 Alenia Aeronautica S.P.A. Method for detecting the thickness of the walls of hollow manufactured bodies made from non-ferromagnetic material
CN107607595A (en) * 2017-09-21 2018-01-19 京东方科技集团股份有限公司 Optical filter detection means and method

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