GB637471A - Improvements in or relating to means for determining the thickness of non-magnetic coatings upon magnetic bases - Google Patents

Improvements in or relating to means for determining the thickness of non-magnetic coatings upon magnetic bases

Info

Publication number
GB637471A
GB637471A GB2390847A GB2390847A GB637471A GB 637471 A GB637471 A GB 637471A GB 2390847 A GB2390847 A GB 2390847A GB 2390847 A GB2390847 A GB 2390847A GB 637471 A GB637471 A GB 637471A
Authority
GB
United Kingdom
Prior art keywords
magnetic
thickness
contact
spring
core
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
GB2390847A
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.)
Birmingham Small Arms Co Ltd
Original Assignee
Birmingham Small Arms 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 Birmingham Small Arms Co Ltd filed Critical Birmingham Small Arms Co Ltd
Priority to GB2390847A priority Critical patent/GB637471A/en
Publication of GB637471A publication Critical patent/GB637471A/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

637,471. Magnetic thickness gauges. BIRMINGHAM SMALL ARMS CO., Ltd., BENNETT, R. S., and WALTON, K. Aug. 29, 1947, No. 23908. [Class 37] Apparatus for determining the thickness of a non- magnetic coating on a magnetic base comprise an electromagnet 3 having a movable core 9 surrounded by a movable, non-magnetic sleeve 5, and normally held with a contact on its upper end against a fixed contact 27 by a spring 15. In operation, the unit is pressed normally against the test surface to push back an extending portion of the sleeve 5 against a spring 25 until the core 9 is in contact with the work surface. The pressure is then removed and the body of the instrument is moved away from the surface by the spring 25 but the core is held magnetically against the surface. The circuit over contact 27 is thus broken and lamp 57, Fig. 4, is extinguished The energizing current of the electromagnet is then reduced by a variable resistance 49 until the. armature is just released and lamp 57 relights, the current, indicated on a meter 45 being a measure of the thickness of coating on the work-piece. Specification 615,763 is referred to.
GB2390847A 1947-08-29 1947-08-29 Improvements in or relating to means for determining the thickness of non-magnetic coatings upon magnetic bases Expired GB637471A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2390847A GB637471A (en) 1947-08-29 1947-08-29 Improvements in or relating to means for determining the thickness of non-magnetic coatings upon magnetic bases

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2390847A GB637471A (en) 1947-08-29 1947-08-29 Improvements in or relating to means for determining the thickness of non-magnetic coatings upon magnetic bases

Publications (1)

Publication Number Publication Date
GB637471A true GB637471A (en) 1950-05-17

Family

ID=10203248

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2390847A Expired GB637471A (en) 1947-08-29 1947-08-29 Improvements in or relating to means for determining the thickness of non-magnetic coatings upon magnetic bases

Country Status (1)

Country Link
GB (1) GB637471A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1223569B (en) * 1960-09-08 1966-08-25 Commissariat Energie Atomique Device for determining the layer thickness by beta-irradiation and measuring the backscattered characteristic X-ray radiation
DE19722014A1 (en) * 1997-05-27 1998-12-03 Nix Steingroeve Elektro Physik Measuring probe for determining thickness of layers on carrier material
DE19735433C2 (en) * 1996-09-04 1999-10-07 Nix Steingroeve Elektro Physik Measuring probe for measuring thin layers using a magnetic or eddy current method
DE19635855C2 (en) * 1996-09-04 2001-03-08 Elektrophysik Dr Steingroever Method and measuring probe for measuring the thickness of powdery or soft layer materials on a solid base material
CN106940168A (en) * 2017-05-08 2017-07-11 成都锦江电子系统工程有限公司 A kind of electromagnetic wave absorbing coating thickness nondestructive thickness measuring instrument probe and thickness measuring method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1223569B (en) * 1960-09-08 1966-08-25 Commissariat Energie Atomique Device for determining the layer thickness by beta-irradiation and measuring the backscattered characteristic X-ray radiation
DE19735433C2 (en) * 1996-09-04 1999-10-07 Nix Steingroeve Elektro Physik Measuring probe for measuring thin layers using a magnetic or eddy current method
DE19635855C2 (en) * 1996-09-04 2001-03-08 Elektrophysik Dr Steingroever Method and measuring probe for measuring the thickness of powdery or soft layer materials on a solid base material
DE19722014A1 (en) * 1997-05-27 1998-12-03 Nix Steingroeve Elektro Physik Measuring probe for determining thickness of layers on carrier material
DE19722014C2 (en) * 1997-05-27 1999-11-04 Nix Steingroeve Elektro Physik Measuring probe for measuring the thickness of layers on a substrate
CN106940168A (en) * 2017-05-08 2017-07-11 成都锦江电子系统工程有限公司 A kind of electromagnetic wave absorbing coating thickness nondestructive thickness measuring instrument probe and thickness measuring method

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