GB1329302A - Eddy current flaw detector apparatus - Google Patents

Eddy current flaw detector apparatus

Info

Publication number
GB1329302A
GB1329302A GB1329302DA GB1329302A GB 1329302 A GB1329302 A GB 1329302A GB 1329302D A GB1329302D A GB 1329302DA GB 1329302 A GB1329302 A GB 1329302A
Authority
GB
United Kingdom
Prior art keywords
eddy current
gain
amplifier
circuit
gate
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
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.)
JFE Engineering Corp
Original Assignee
Nippon Kokan 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 Nippon Kokan Ltd filed Critical Nippon Kokan Ltd
Publication of GB1329302A publication Critical patent/GB1329302A/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

Abstract

1329302 Eddy current flow detectors NIPPON KOKAN K K 16 Sept 1970 44332/70 Heading G1N Automatic calibration of an eddy current flow detector is provided by automatically adjusting the gain of an amplifier 3 located in the circuit path between a detecting coil arrangement 1, e.g. a bridge, and a recorder 61. When a test flaw is caused to influence the arrangement 1, the pulse produced is gated by a gate 65 under control of a circuit 66, Fig. 3 (not shown), and is analysed in a pulse-height analyser 62 which then provides an appropriate output of one of its many channels. The gain of amplifier 3 is controlled by the output via a voltage-dividing circuit 63 and an OR gate each having the same number of channels as the analyser 62.
GB1329302D 1970-09-16 1970-09-16 Eddy current flaw detector apparatus Expired GB1329302A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4433270 1970-09-16

Publications (1)

Publication Number Publication Date
GB1329302A true GB1329302A (en) 1973-09-05

Family

ID=10432793

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1329302D Expired GB1329302A (en) 1970-09-16 1970-09-16 Eddy current flaw detector apparatus

Country Status (1)

Country Link
GB (1) GB1329302A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2675579A1 (en) * 1991-04-22 1992-10-23 Tokyo Gas Co Ltd FAULT DETECTOR FOR A METAL MATERIAL, IN PARTICULAR A PIPE, AND A DISTANCE FIELD FOUCAULT CURRENT SENSOR FOR THIS SENSOR.
GB2281399A (en) * 1991-04-22 1995-03-01 Tokyo Gas Co Ltd Eddy current flaw detector

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2675579A1 (en) * 1991-04-22 1992-10-23 Tokyo Gas Co Ltd FAULT DETECTOR FOR A METAL MATERIAL, IN PARTICULAR A PIPE, AND A DISTANCE FIELD FOUCAULT CURRENT SENSOR FOR THIS SENSOR.
GB2255184A (en) * 1991-04-22 1992-10-28 Tokyo Gas Co Ltd Eddy current flaw detector
US5210492A (en) * 1991-04-22 1993-05-11 Tokyo Gas Co., Ltd. Remote field eddy current flaw detector for metal pipes having a pair of receiver coils providing a differential offset amplitude signal
US5365169A (en) * 1991-04-22 1994-11-15 Tokyo Gas Co., Ltd. Remote field eddy current flaw detector for metal material including attenuator, adder, phase shiftery and phase comparator
GB2281399A (en) * 1991-04-22 1995-03-01 Tokyo Gas Co Ltd Eddy current flaw detector
GB2255184B (en) * 1991-04-22 1995-08-16 Tokyo Gas Co Ltd Flaw detector for metal material
GB2281399B (en) * 1991-04-22 1995-08-16 Tokyo Gas Co Ltd Flaw detector for metal material
US5461312A (en) * 1991-04-22 1995-10-24 Tokyo Gas Co., Ltd. Remote field eddy current sensor for detecting flaws in metal material

Similar Documents

Publication Publication Date Title
GB1261346A (en) Improvements in or relating to the detection of magnetic discontinuities
GB1378711A (en) Eddy current nondestructive testing system
GB1458551A (en) Pulse eddy current testing apparatus
GB1329302A (en) Eddy current flaw detector apparatus
US2968729A (en) Apparatus for direct measurement of mass per unit area
GB1157139A (en) Improvements in a Method and Device for the Continuous Analysis of the Composition of a Gas
US3676678A (en) Single chamber ionization smoke detector
GB1113006A (en) Method and apparatus for magnetic reaction testing
JPS5262043A (en) Automatic testing instrument
GB1130958A (en) Material tester
GB1352758A (en) Flaw detector
GB1118349A (en) Method and apparatus for measuring the concentration of radiation absorbing material
GB1275104A (en) Eddy current test apparatus
JPS5713380A (en) Discriminating circuit for radiation detecting signal
GB1302354A (en)
GB1153705A (en) Method and apparatus for Regulating the Discharge from a Jig
SU146783A1 (en) Method of compensating for the inaccuracy of recoil of magnetic carrier
GB1257265A (en)
GB973322A (en) Method of and equipment for the non-destructive testing of steel products
GB1166890A (en) Improvements in or relating to Radiation Measuring Apparatus
SU1093966A1 (en) Method of checking coordinates of acoustic emission source
JPS56123800A (en) Excitation regulating device for generator
SU392382A1 (en) DEVICE FOR RADIATION DEFEKTSKII
SU1002947A2 (en) Device for measuring width of crack in steel tape
GB1267434A (en) Apparatus and method of testing a magnetic recording medium

Legal Events

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