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GB1293821A - A device for measuring ferrite content - Google Patents

A device for measuring ferrite content

Info

Publication number
GB1293821A
GB1293821A GB1449770A GB1449770A GB1293821A GB 1293821 A GB1293821 A GB 1293821A GB 1449770 A GB1449770 A GB 1449770A GB 1449770 A GB1449770 A GB 1449770A GB 1293821 A GB1293821 A GB 1293821A
Authority
GB
United Kingdom
Prior art keywords
thickness
probe
bridge
film
ferromagnetic
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
GB1449770A
Inventor
Ian Charrington Sellars
Lawrence Mossom
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.)
Elcometer Instruments Ltd
Original Assignee
Elcometer Instruments 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 Elcometer Instruments Ltd filed Critical Elcometer Instruments Ltd
Priority to GB1449770A priority Critical patent/GB1293821A/en
Priority to DE19712114143 priority patent/DE2114143A1/en
Publication of GB1293821A publication Critical patent/GB1293821A/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
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

1293821 Electro-physical measurements ELCOMETER INSTRUMENTS Ltd 19 April 1971 [25 March 1970] 14497/70 Heading G1N A magnetic flux density probe includes a permanent magnet 10 and a ferromagnetic tip 12 defining an air-gap in which is mounted a magnetoresistor MR1 and a thermistor Th1. The probe is connected via leads a, b, c, into a bridge circuit, Fig. 2 with the magneto resistor forming one arm and the temperature compensating thermistor forming part of another arm. To measure the thickness of a film of non- ferromagnetic material the bridge is balanced with the tip 12 first resting on a ferromagnetic plate. The film is then placed between the plate and tip 12 and the reading of galvanometer 14 calibrated in thickness of film noted, the amount of bridge imbalance being proportional to the film thickness which varies the flux density in the probe gap. In order to measure the thickness of a nickel film applied to a non-ferromagnetic substrate or the ferrite content of stainless steel, variable resistor VR2 is adjusted to balance the bridge with the probe in free air and then the probe is applied to the material or object being tested. Since the flux in the air-gap is also dependent upon the magnetic permeability of the object the bridge unbalance gives the measurement of the thickness or content.
GB1449770A 1970-03-25 1970-03-25 A device for measuring ferrite content Expired GB1293821A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1449770A GB1293821A (en) 1970-03-25 1970-03-25 A device for measuring ferrite content
DE19712114143 DE2114143A1 (en) 1970-03-25 1971-03-24 Device for measuring the magnetic flux density

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1449770A GB1293821A (en) 1970-03-25 1970-03-25 A device for measuring ferrite content

Publications (1)

Publication Number Publication Date
GB1293821A true GB1293821A (en) 1972-10-25

Family

ID=10042258

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1449770A Expired GB1293821A (en) 1970-03-25 1970-03-25 A device for measuring ferrite content

Country Status (2)

Country Link
DE (1) DE2114143A1 (en)
GB (1) GB1293821A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2029580A (en) * 1978-08-10 1980-03-19 Central Electr Generat Board Devices for detecting ferromagnetic particles in a liquid
US4518919A (en) * 1981-01-16 1985-05-21 Tokyo Shibaura Denki Kabushiki Kaisha Detecting device for detecting a magnetic strip embedded in a sheet
US5070298A (en) * 1989-04-19 1991-12-03 Diesel Kiki Co., Ltd. Magnetic sensor, with sensor gap adjusting high permeable flux collecting chip, for detecting rotation

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2433746A1 (en) * 1978-08-18 1980-03-14 Otdel Fiz Nerazrushajuschego Continuous magnetic monitoring of objects of complicated shape - is measuring tangential field components gradients
EP0028487A1 (en) * 1979-11-02 1981-05-13 Upa Technology, Inc. Hall effect thickness measuring instrument

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2029580A (en) * 1978-08-10 1980-03-19 Central Electr Generat Board Devices for detecting ferromagnetic particles in a liquid
GB2029580B (en) * 1978-08-10 1983-06-15 Central Electr Generat Board Improvements in or relating to the collection and sensing of magnetic debris in lubricating oil and other liquids
US4518919A (en) * 1981-01-16 1985-05-21 Tokyo Shibaura Denki Kabushiki Kaisha Detecting device for detecting a magnetic strip embedded in a sheet
US5070298A (en) * 1989-04-19 1991-12-03 Diesel Kiki Co., Ltd. Magnetic sensor, with sensor gap adjusting high permeable flux collecting chip, for detecting rotation

Also Published As

Publication number Publication date
DE2114143A1 (en) 1971-10-14

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee