GB1312710A - Method for measuring the thickness of a coating - Google Patents

Method for measuring the thickness of a coating

Info

Publication number
GB1312710A
GB1312710A GB5805670A GB5805670A GB1312710A GB 1312710 A GB1312710 A GB 1312710A GB 5805670 A GB5805670 A GB 5805670A GB 5805670 A GB5805670 A GB 5805670A GB 1312710 A GB1312710 A GB 1312710A
Authority
GB
United Kingdom
Prior art keywords
tube
coating
thickness
voltage
absence
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
GB5805670A
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.)
Centre Scientifique et Technique du Batiment CSTB
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
Centre Scientifique et Technique du Batiment CSTB
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 Commissariat a lEnergie Atomique CEA, Centre Scientifique et Technique du Batiment CSTB filed Critical Commissariat a lEnergie Atomique CEA
Publication of GB1312710A publication Critical patent/GB1312710A/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

1312710 Electro-physical measurement COMMISSARIAT A L'ENERGIE ATOMIQUE and CENTRE SCIENTIFIQUE ET TECHNIQUE DU BATIMENT 7 Dec 1970 [19 Dec 1969] 58056/70 Heading G1N The thickness of a metallic coating on the inner or outer surface of a cylindrical metal tube 1, e. g. galvanized iron tube, is measured by applying an A. C. to excitation coil 2 coaxial with the tube 1 and detecting the voltage induced in detection coil 3, arranged coaxial with coil 2 and nearest the coating, in the presence and absence of the tube The ratio of the two measured values is a function of the coating thickness. The oscillator frequency is adjusted so that the skin thickness of the coating is at least equal to the thickness of the coating. Initially in the absence of the tube the output e 3 from differential amplifier 13 connected via amplifier 9 and rectifier 10 to detector coil 3 and reference voltage e 2 is nulled. The probe 2, 3 is then inserted in or around the tube depending on the position of the coating and the output voltage as indicated on meter 12 as a measure of coating thickness. The difference voltage e 3 is also applied after amplification at 16 to one input of a trigger circuit 17 so that if voltage e 4 is less than the preset reference voltage applied to the other input lamp 19 lights. Curves of Ho/Hi, where Hi is magnetic field along the tube axis in the presence of the shield and Ho the field in the absence of the tube, against thickness at various frequencies are described together with their derivation, Fig. 2 (not shown).
GB5805670A 1969-12-19 1970-12-07 Method for measuring the thickness of a coating Expired GB1312710A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6944125A FR2071173A5 (en) 1969-12-19 1969-12-19

Publications (1)

Publication Number Publication Date
GB1312710A true GB1312710A (en) 1973-04-04

Family

ID=9044870

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5805670A Expired GB1312710A (en) 1969-12-19 1970-12-07 Method for measuring the thickness of a coating

Country Status (6)

Country Link
BE (1) BE760394A (en)
CH (1) CH533292A (en)
DE (1) DE2061708A1 (en)
ES (1) ES386647A1 (en)
FR (1) FR2071173A5 (en)
GB (1) GB1312710A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2124779A (en) * 1982-08-06 1984-02-22 Australian Wire Ind Pty Determination of coating thickness
GB2293016A (en) * 1994-09-02 1996-03-13 Defelsko Corp Anodic capacity gauge

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4072895A (en) * 1976-01-27 1978-02-07 Rogachev Viktor Igorevich Eddy current converter for non-destructive testing of electrically conducting coating in holes of printed circuit boards
US5017869A (en) * 1989-12-14 1991-05-21 General Electric Company Swept frequency eddy current system for measuring coating thickness
DE19652750C2 (en) * 1996-12-18 1999-12-02 Bosch Gmbh Robert Method for determining a thickness of a layer of electrically conductive material

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2124779A (en) * 1982-08-06 1984-02-22 Australian Wire Ind Pty Determination of coating thickness
US4593244A (en) * 1982-08-06 1986-06-03 Australian Wire Industries Pty. Ltd. Determination of the thickness of a coating on a highly elongated article
GB2293016A (en) * 1994-09-02 1996-03-13 Defelsko Corp Anodic capacity gauge
US5623427A (en) * 1994-09-02 1997-04-22 Defelsko Corporation Nondestructive anodic capacity gauge
GB2293016B (en) * 1994-09-02 1998-08-12 Defelsko Corp A nondestructive anodic capacity gauge

Also Published As

Publication number Publication date
CH533292A (en) 1973-01-31
DE2061708A1 (en) 1971-07-01
ES386647A1 (en) 1973-03-16
FR2071173A5 (en) 1971-09-17
BE760394A (en) 1971-05-27

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees