GB636441A - Improvements in electromagnetic testing - Google Patents

Improvements in electromagnetic testing

Info

Publication number
GB636441A
GB636441A GB4503/48A GB450348A GB636441A GB 636441 A GB636441 A GB 636441A GB 4503/48 A GB4503/48 A GB 4503/48A GB 450348 A GB450348 A GB 450348A GB 636441 A GB636441 A GB 636441A
Authority
GB
United Kingdom
Prior art keywords
transformer
filter network
magnetic
coupled
shockexcited
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
GB4503/48A
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.)
Magnetic Analysis Corp
Original Assignee
Magnetic Analysis 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 Magnetic Analysis Corp filed Critical Magnetic Analysis Corp
Publication of GB636441A publication Critical patent/GB636441A/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
    • G01N27/904—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 with two or more sensors

Abstract

636,441. Magnetic tests and measurements. MAGNETIC ANALYSIS CORPORATION. Feb. 16, 1948, No. 4503. Convention 'date, Nov. 19, 1942. [Class 37] In a system for testing magnetic material, the travelling material 7 forms the core of a transformer, a secondary 8 of which is coupled to an instrument 15 for indicating variations in amplitude or phase, by way of a filter network 10-13, designed to eliminate the supply frequency and comprising a circuit tuned to a higher frequency and arranged to be shockexcited by the distortion impulse of the exciting waveform due to the test material. The transformer may also have a group of secondaries 16-19 connected in series, two of which are variably tapped, connected so as normally to produce a very small output and coupled via a matching transformer 23 and a filter network 25-28 similar to that described above, to an indicator 30, and if desired an oscillograph 33. Specification 520,328 is referred to. In the Specification as open to inspection under Sect. 91, the filter network 25-28 was optional. This subject-matter does not appear in the Specification as accepted.
GB4503/48A 1942-11-19 1948-02-16 Improvements in electromagnetic testing Expired GB636441A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US636441XA 1942-11-19 1942-11-19

Publications (1)

Publication Number Publication Date
GB636441A true GB636441A (en) 1950-04-26

Family

ID=22050559

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4503/48A Expired GB636441A (en) 1942-11-19 1948-02-16 Improvements in electromagnetic testing

Country Status (1)

Country Link
GB (1) GB636441A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2436451A1 (en) * 1978-09-15 1980-04-11 H R Electronics Co DEVICE FOR DETECTING METAL OBJECTS, PARTICULARLY COINS AND CIRCUIT FOR SUCH A DEVICE
EP0017682A2 (en) * 1979-04-17 1980-10-29 Geoprobe Limited Method and system for geophysical induction surveying

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2436451A1 (en) * 1978-09-15 1980-04-11 H R Electronics Co DEVICE FOR DETECTING METAL OBJECTS, PARTICULARLY COINS AND CIRCUIT FOR SUCH A DEVICE
EP0017682A2 (en) * 1979-04-17 1980-10-29 Geoprobe Limited Method and system for geophysical induction surveying
EP0017682A3 (en) * 1979-04-17 1981-04-22 Geoprobe Limited Method and system for geophysical induction surveying

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