GB913780A - Method of obtaining an electrical signal proportional to the cross-sectional area of a magnetic tube or rod - Google Patents

Method of obtaining an electrical signal proportional to the cross-sectional area of a magnetic tube or rod

Info

Publication number
GB913780A
GB913780A GB2949560A GB2949560A GB913780A GB 913780 A GB913780 A GB 913780A GB 2949560 A GB2949560 A GB 2949560A GB 2949560 A GB2949560 A GB 2949560A GB 913780 A GB913780 A GB 913780A
Authority
GB
United Kingdom
Prior art keywords
coil
rod
tube
constant
area
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
GB2949560A
Inventor
Eric Arthur North Whitehead
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.)
TI Group Services Ltd
Original Assignee
TI Group Services 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 TI Group Services Ltd filed Critical TI Group Services Ltd
Priority to GB2949560A priority Critical patent/GB913780A/en
Publication of GB913780A publication Critical patent/GB913780A/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
    • G01B7/32—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring areas

Abstract

913,780. Electric tests. T.I. (GROUP SERVICES) Ltd. Sept. 13, 1961 [Aug. 26, 1960], No. 29495/60. Class 37. The cross-sectional area of a magnetic tube or rod 1 is determined by passing it through a coil 3 which saturates it magnetically and then amplifying, integrating and measuring at 6 the E.M.F. in a further coil 5 surrounding the rod. The Specification explains that the output of the coil consists of three terms, one dependent on the coil area, one on the saturating field and the other a constant. The integration is set so that with no tube present the second and third terms cancel each other so that the instrument indicates tube area directly. In a further embodiment a pair of detecting coils are provided whose areas are inversely proportional to the turns ratio and the difference is a measure of tube area. If an alternating saturating field is used the maximum values of each half-cycle are constant but of opposite polarity. These values are subtracted so that double the first and second terms referred to above and no constant appear in the output. The meter is initially set to read double the second so that the first is indicated directly.
GB2949560A 1960-08-26 1960-08-26 Method of obtaining an electrical signal proportional to the cross-sectional area of a magnetic tube or rod Expired GB913780A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2949560A GB913780A (en) 1960-08-26 1960-08-26 Method of obtaining an electrical signal proportional to the cross-sectional area of a magnetic tube or rod

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2949560A GB913780A (en) 1960-08-26 1960-08-26 Method of obtaining an electrical signal proportional to the cross-sectional area of a magnetic tube or rod

Publications (1)

Publication Number Publication Date
GB913780A true GB913780A (en) 1962-12-28

Family

ID=10292458

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2949560A Expired GB913780A (en) 1960-08-26 1960-08-26 Method of obtaining an electrical signal proportional to the cross-sectional area of a magnetic tube or rod

Country Status (1)

Country Link
GB (1) GB913780A (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2124778A (en) * 1982-08-04 1984-02-22 Pa Inc Method and apparatus for magnetically checking the wall thickness of a ferromagnetic element
US4495465A (en) * 1982-05-03 1985-01-22 Rotesco Inc. Method and apparatus for non-destructive testing of magnetically permeable bodies using a first flux to saturate the body and a second flux opposing the first flux to produce a measurable flux
US4629991A (en) * 1984-04-11 1986-12-16 Pa Incorporated Methods and apparatus for detecting tubular defects having a plurality of expandable arcuate segments
US4636727A (en) * 1984-04-11 1987-01-13 Pa Incorporated Method and apparatus for detecting the location of defects in tubular sections moving past a well head
US4659991A (en) * 1983-03-31 1987-04-21 Ndt Technologies, Inc. Method and apparatus for magnetically inspecting elongated objects for structural defects
US4698590A (en) * 1984-04-11 1987-10-06 Pa Incorporated Method and apparatus for measuring velocity of ferromagnetic tubing
US4704580A (en) * 1984-04-11 1987-11-03 Pa Incorporated Method and apparatus for measuring the depth of local defects in ferromagnetic elements
US4710712A (en) * 1984-04-11 1987-12-01 Pa Incorporated Method and apparatus for measuring defects in ferromagnetic elements
US4715442A (en) * 1984-04-11 1987-12-29 Pa Incorporated Apparatus for servicing tubular strings in subterranean wells
US4792756A (en) * 1984-04-11 1988-12-20 Pa Incorporated Method and apparatus for measuring axially extending defects in ferromagnetic elements
EP0816797A2 (en) * 1996-06-28 1998-01-07 Tokyo Rope Mfg. Co., Ltd. Apparatus for and method of measuring corrosion degree of cable
GB2321709A (en) * 1997-02-01 1998-08-05 British Steel Plc Thickness measurement

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4495465A (en) * 1982-05-03 1985-01-22 Rotesco Inc. Method and apparatus for non-destructive testing of magnetically permeable bodies using a first flux to saturate the body and a second flux opposing the first flux to produce a measurable flux
US4555665A (en) * 1982-08-04 1985-11-26 Pa Incorporated Magnetic flux method for measuring tubular wall thickness
GB2124778A (en) * 1982-08-04 1984-02-22 Pa Inc Method and apparatus for magnetically checking the wall thickness of a ferromagnetic element
US4659991A (en) * 1983-03-31 1987-04-21 Ndt Technologies, Inc. Method and apparatus for magnetically inspecting elongated objects for structural defects
US4710712A (en) * 1984-04-11 1987-12-01 Pa Incorporated Method and apparatus for measuring defects in ferromagnetic elements
US4636727A (en) * 1984-04-11 1987-01-13 Pa Incorporated Method and apparatus for detecting the location of defects in tubular sections moving past a well head
US4698590A (en) * 1984-04-11 1987-10-06 Pa Incorporated Method and apparatus for measuring velocity of ferromagnetic tubing
US4704580A (en) * 1984-04-11 1987-11-03 Pa Incorporated Method and apparatus for measuring the depth of local defects in ferromagnetic elements
US4629991A (en) * 1984-04-11 1986-12-16 Pa Incorporated Methods and apparatus for detecting tubular defects having a plurality of expandable arcuate segments
US4715442A (en) * 1984-04-11 1987-12-29 Pa Incorporated Apparatus for servicing tubular strings in subterranean wells
US4792756A (en) * 1984-04-11 1988-12-20 Pa Incorporated Method and apparatus for measuring axially extending defects in ferromagnetic elements
EP0816797A2 (en) * 1996-06-28 1998-01-07 Tokyo Rope Mfg. Co., Ltd. Apparatus for and method of measuring corrosion degree of cable
EP0816797A3 (en) * 1996-06-28 1998-02-11 Tokyo Rope Mfg. Co., Ltd. Apparatus for and method of measuring corrosion degree of cable
US6172501B1 (en) 1996-06-28 2001-01-09 Tokyo Rope Mfg. Co., Ltd. Method and apparatus for measuring the degree of cable corrosion
GB2321709A (en) * 1997-02-01 1998-08-05 British Steel Plc Thickness measurement
GB2321709B (en) * 1997-02-01 2001-08-08 British Steel Plc Thickness or cross-sectional area measurement

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