GB1475517A - Detection of surface defects in elongate metallic members - Google Patents

Detection of surface defects in elongate metallic members

Info

Publication number
GB1475517A
GB1475517A GB2859774A GB2859774A GB1475517A GB 1475517 A GB1475517 A GB 1475517A GB 2859774 A GB2859774 A GB 2859774A GB 2859774 A GB2859774 A GB 2859774A GB 1475517 A GB1475517 A GB 1475517A
Authority
GB
United Kingdom
Prior art keywords
amplifier
output
probe
input
frequency
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
GB2859774A
Other languages
English (en)
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.)
British Steel Corp
Original Assignee
British Steel 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 British Steel Corp filed Critical British Steel Corp
Priority to GB2859774A priority Critical patent/GB1475517A/en
Priority to IT68629/75A priority patent/IT1036366B/it
Priority to NL7507581A priority patent/NL7507581A/xx
Priority to US05/590,194 priority patent/US3974442A/en
Priority to FR7519863A priority patent/FR2276588A1/fr
Priority to CA230,220A priority patent/CA1019031A/en
Priority to DE2528625A priority patent/DE2528625C2/de
Priority to SE7507332A priority patent/SE403188B/xx
Priority to ZA00754101A priority patent/ZA754101B/xx
Priority to BE157773A priority patent/BE830751A/xx
Publication of GB1475517A publication Critical patent/GB1475517A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
    • G01N27/9046—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents by analysing electrical signals
    • G01N27/9053—Compensating for probe to workpiece spacing
    • 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
    • G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
GB2859774A 1974-06-27 1974-06-27 Detection of surface defects in elongate metallic members Expired GB1475517A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
GB2859774A GB1475517A (en) 1974-06-27 1974-06-27 Detection of surface defects in elongate metallic members
IT68629/75A IT1036366B (it) 1974-06-27 1975-06-25 Apparecchio per il rilevamento di difetti superficiali su oggetti metallici allungati particolarmente billette d acciaio
NL7507581A NL7507581A (nl) 1974-06-27 1975-06-25 Inrichting voor detectie van oppervlakfouten in een langwerpig metalen orgaan.
US05/590,194 US3974442A (en) 1974-06-27 1975-06-25 Surface defect probe and dual channel apparatus with liftoff compensation
FR7519863A FR2276588A1 (fr) 1974-06-27 1975-06-25 Appareil de detection de defauts de surface dans des objets metalliques
CA230,220A CA1019031A (en) 1974-06-27 1975-06-26 Detection of surface defects in elongate metallic members
DE2528625A DE2528625C2 (de) 1974-06-27 1975-06-26 Vorrichtung zur zerstörungsfreien Oberflächenprüfung eines langgestreckten metallischen Körpers
SE7507332A SE403188B (sv) 1974-06-27 1975-06-26 Apparat for detektering av ytdefekter hos langstreckta metallelement
ZA00754101A ZA754101B (en) 1974-06-27 1975-06-26 Detection of surface defects in elongate metallic members
BE157773A BE830751A (fr) 1974-06-27 1975-06-27 Detection de defauts superficiels dans de longs objets metalliques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2859774A GB1475517A (en) 1974-06-27 1974-06-27 Detection of surface defects in elongate metallic members

Publications (1)

Publication Number Publication Date
GB1475517A true GB1475517A (en) 1977-06-01

Family

ID=10278129

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2859774A Expired GB1475517A (en) 1974-06-27 1974-06-27 Detection of surface defects in elongate metallic members

Country Status (10)

Country Link
US (1) US3974442A (https=)
BE (1) BE830751A (https=)
CA (1) CA1019031A (https=)
DE (1) DE2528625C2 (https=)
FR (1) FR2276588A1 (https=)
GB (1) GB1475517A (https=)
IT (1) IT1036366B (https=)
NL (1) NL7507581A (https=)
SE (1) SE403188B (https=)
ZA (1) ZA754101B (https=)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2169080A (en) * 1984-09-25 1986-07-02 Centro Speriment Metallurg Measurement system for the detection of defects in electrically conductive material

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2850433A1 (de) * 1977-11-22 1979-05-23 British Steel Corp Vorrichtung zum auffinden von oberflaechenfehlern an werkstuecken
US4237419A (en) * 1978-06-07 1980-12-02 Tornbloms Kvalitetskontroll Ab Method and apparatus for non-destructive testing using a plurality of frequencies
DE2849235C3 (de) * 1978-11-13 1981-12-24 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Meßeinrichtung zur Eliminierung von auf Inhomogenitäten der Permeabilität und der elektrischen Leitfähigkeit zurückführenden Störeffekten bei der Schwingungsmessung an einem rotierenden, schwingenden Element
US4383218A (en) * 1978-12-29 1983-05-10 The Boeing Company Eddy current flow detection including compensation for system variables such as lift-off
JPS55129749A (en) * 1979-03-28 1980-10-07 Sumitomo Metal Ind Ltd Sensitivity correction method for electromagnetic ultrasonic wave probe
GB2068558B (en) * 1980-01-29 1983-07-27 British Steel Corp Billet surface inspection system
GB2069699B (en) * 1980-02-14 1983-10-12 British Steel Corp Surface inspection equipment
DE3005915C2 (de) * 1980-02-16 1985-01-10 Skf Kugellagerfabriken Gmbh, 8720 Schweinfurt Wirbelstromprüfgerät für Oberflächenfehler
US4424486A (en) 1980-10-14 1984-01-03 Zetec, Inc. Phase rotation circuit for an eddy current tester
FR2502337A1 (fr) * 1981-03-23 1982-09-24 Commissariat Energie Atomique Procede de controle non destructif par courants de foucault avec correction des effets d'entrefer et dispositif de mise en oeuvre
SE456043B (sv) * 1984-02-10 1988-08-29 Bengt Hjalmar Tornblom Sett och anordning for provning och/eller metning av elektriskt ledande provobjekt med avseende pa forendringar
DE3517114A1 (de) * 1985-05-11 1986-11-13 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 8000 München Wirbelstromverfahren zur untersuchung der spannungsrisskorrosion in austenitischen bauteilen sowie vorrichtung zur durchfuehrung des verfahrens
US4688580A (en) * 1985-07-11 1987-08-25 The Johns Hopkins University Non-invasive electromagnetic technique for monitoring bone healing and bone fracture localization
JPS62299755A (ja) * 1986-06-20 1987-12-26 Nitto Gurasufuaibaa Kogyo Kk ガラス繊維中の導電性物質の検出方法及び検出装置
SE456606B (sv) * 1987-02-18 1988-10-17 Tornbloms Kvalitetskontroll Ab Anordning for metning och/eller provning av dimension och/eller form via avstandsmetning
US4875007A (en) * 1988-02-17 1989-10-17 The Indikon Company, Inc. Eddy current proximity system
ZA90813B (en) * 1989-03-29 1991-03-27 Boc Group Inc Method of reducing the oxygen concentration in a psa nitrogen product stream
FR2667158B1 (fr) * 1990-09-21 1993-01-22 Thomson Csf Dispositif de traitement d'un signal provenant d'un capteur ayant une reponse du type derivatif.
US5544953A (en) * 1994-05-18 1996-08-13 General Electric Co. Rolling-ball thermoelectric potential probe and housing for nondestructive testing of metallic and semiconductor objects
DE19954968C2 (de) * 1999-11-16 2001-09-20 Bosch Gmbh Robert Anordnung zur Bestimmung der Eigenschaften magnetoresistiver Prüflinge
CN107632064B (zh) * 2017-08-25 2021-12-21 爱德森（厦门）电子有限公司 一种涡流检测干扰信号抑制方法
CN113777157B (zh) * 2021-10-09 2024-12-20 云南电网有限责任公司玉溪供电局 基于阻抗谱的电缆铅封缺陷带电检测系统及其检测方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2744233A (en) * 1952-05-26 1956-05-01 Associated Spring Corp Apparatus for detecting flaws in metal stock
US2985824A (en) * 1958-04-14 1961-05-23 Jr Claus J Renken Nondestructive eddy current testing
US3358225A (en) * 1964-03-27 1967-12-12 Richard S Peugeot Lift-off compensation for eddy current testers
GB1318346A (en) * 1969-09-12 1973-05-31 Owston C N High-frequency eddy-current non-destructuve testing apparatus
US3611120A (en) * 1970-02-24 1971-10-05 Forster F M O Eddy current testing systems with means to compensate for probe to workpiece spacing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2169080A (en) * 1984-09-25 1986-07-02 Centro Speriment Metallurg Measurement system for the detection of defects in electrically conductive material

Also Published As

Publication number Publication date
FR2276588A1 (fr) 1976-01-23
IT1036366B (it) 1979-10-30
US3974442A (en) 1976-08-10
SE403188B (sv) 1978-07-31
CA1019031A (en) 1977-10-11
DE2528625A1 (de) 1976-01-15
FR2276588B1 (https=) 1981-06-12
DE2528625C2 (de) 1987-01-15
BE830751A (fr) 1975-10-16
ZA754101B (en) 1976-06-30
NL7507581A (nl) 1975-12-30
SE7507332L (sv) 1975-12-29

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee