GB854240A - Flatness gauge - Google Patents

Flatness gauge

Info

Publication number
GB854240A
GB854240A GB629657A GB629657A GB854240A GB 854240 A GB854240 A GB 854240A GB 629657 A GB629657 A GB 629657A GB 629657 A GB629657 A GB 629657A GB 854240 A GB854240 A GB 854240A
Authority
GB
United Kingdom
Prior art keywords
strip
coils
coil
inductance
permeability
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
GB629657A
Inventor
Harry Eugene Brys
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.)
Armco International Corp
Original Assignee
Armco International Corp
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 Armco International Corp filed Critical Armco International Corp
Priority to GB629657A priority Critical patent/GB854240A/en
Priority to DEA27652A priority patent/DE1178612B/en
Publication of GB854240A publication Critical patent/GB854240A/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
    • G01B7/34—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring roughness or irregularity of surfaces
    • G01B7/345—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring roughness or irregularity of surfaces for measuring evenness

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)

Abstract

854,240. Electric tests. ARMCO INTERNATIONAL CORPORATION. Feb. 25, 1957, No. 6296/57. Class 37 The flatness of a body, which may be a strip is determined by locating it on a table 10 in which are recessed sensing coils 12 covered with a plate 14 of air permeability. The inductance of the coils is varied according to the nearness of the strip and each coil forms, with a further balancing coil 25, two arms of a circuit which is balanced in the absence of a strip and gives a maximum output when the strip is completely flat. A number of such coils may be provided transversely of the strip and each may have its own recording channel. In the arrangement of Fig. 1 an oscillograph shows six traces corresponding to the six sensing coils. If the material under examination has a permeability which does not differ substantially from that of air a wheel carried in a pivoted arm may ride on the strip so as to vary the inductance of the coil.
GB629657A 1957-02-25 1957-02-25 Flatness gauge Expired GB854240A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB629657A GB854240A (en) 1957-02-25 1957-02-25 Flatness gauge
DEA27652A DE1178612B (en) 1957-02-25 1957-08-03 Method and device for measuring the deviation of the flatness of a body from a given value

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB629657A GB854240A (en) 1957-02-25 1957-02-25 Flatness gauge

Publications (1)

Publication Number Publication Date
GB854240A true GB854240A (en) 1960-11-16

Family

ID=9811916

Family Applications (1)

Application Number Title Priority Date Filing Date
GB629657A Expired GB854240A (en) 1957-02-25 1957-02-25 Flatness gauge

Country Status (1)

Country Link
GB (1) GB854240A (en)

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