GB1318346A – High-frequency eddy-current non-destructuve testing apparatus
– Google Patents
GB1318346A – High-frequency eddy-current non-destructuve testing apparatus
– Google Patents
High-frequency eddy-current non-destructuve testing apparatus
Info
Publication number
GB1318346A
GB1318346A
GB1318346DA
GB1318346A
GB 1318346 A
GB1318346 A
GB 1318346A
GB 1318346D A
GB1318346D A
GB 1318346DA
GB 1318346 A
GB1318346 A
GB 1318346A
Authority
GB
United Kingdom
Prior art keywords
changes
show
testing apparatus
frequency
oscillator
Prior art date
1969-09-12
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.)
Individual
Original Assignee
Individual
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.)
1969-09-12
Filing date
1969-09-12
Publication date
1973-05-31
1969-09-12
Application filed by Individual
filed
Critical
Individual
1973-05-31
Publication of GB1318346A
publication
Critical
patent/GB1318346A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
G01N27/023—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance where the material is placed in the field of a coil
G01N27/025—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance where the material is placed in the field of a coil a current being generated within the material by induction
Abstract
1318346 Automatic position control C N OWSTON 4 Sept 1970 [12 Sept 1969] 45043/69 Heading G3R [Also in Division G1] In non-destructive eddy current testing apparatus, an inductive probe 12 forming part of an oscillator tuned circuit scans an object 10 to be tested, the coupling between a probe and the object being maintained constant by detecting deviation of the oscillator frequency from a set value, via discriminator 22, to operate a positioning device, e.g. a moving coil device 16. Thus changes in object resistivity show as oscillator amplitude changes (detector 26), surface topography changes show as frequency changes, and cracks show as both amplitude and frequency changes.
GB1318346D
1969-09-12
1969-09-12
High-frequency eddy-current non-destructuve testing apparatus
Expired
GB1318346A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
GB4504369
1969-09-12
Publications (1)
Publication Number
Publication Date
GB1318346A
true
GB1318346A
(en)
1973-05-31
Family
ID=10435659
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB1318346D
Expired
GB1318346A
(en)
1969-09-12
1969-09-12
High-frequency eddy-current non-destructuve testing apparatus
Country Status (2)
Country
Link
DE
(1)
DE2044331A1
(en)
GB
(1)
GB1318346A
(en)
Cited By (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2154324A
(en)
*
1984-02-15
1985-09-04
Derek Harry Graddon Redman
Improvements to dynamic measuring system
US4644274A
(en)
*
1983-04-01
1987-02-17
General Electric Company
Apparatus for supporting an eddy current probe used to scan an irregular surface
WO2000032346A1
(en)
*
1998-12-02
2000-06-08
Paul Leon
Method for assessing the condition of an electrode surface in a spot welding machine and spot welding machine using said method
Families Citing this family (4)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB1475517A
(en)
*
1974-06-27
1977-06-01
British Steel Corp
Detection of surface defects in elongate metallic members
JPS55129749A
(en)
*
1979-03-28
1980-10-07
Sumitomo Metal Ind Ltd
Sensitivity correction method for electromagnetic ultrasonic wave probe
DE3524106A1
(en)
*
1985-07-05
1987-01-15
Thyssen Industrie
SURFACE TESTING DEVICE
DE3839938C1
(en)
*
1988-11-26
1990-04-19
Thyssen Industrie Ag, 4300 Essen, De
1969
1969-09-12
GB
GB1318346D
patent/GB1318346A/en
not_active
Expired
1970
1970-09-08
DE
DE19702044331
patent/DE2044331A1/en
active
Pending
Cited By (4)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US4644274A
(en)
*
1983-04-01
1987-02-17
General Electric Company
Apparatus for supporting an eddy current probe used to scan an irregular surface
GB2154324A
(en)
*
1984-02-15
1985-09-04
Derek Harry Graddon Redman
Improvements to dynamic measuring system
WO2000032346A1
(en)
*
1998-12-02
2000-06-08
Paul Leon
Method for assessing the condition of an electrode surface in a spot welding machine and spot welding machine using said method
FR2786720A1
(en)
*
1998-12-02
2000-06-09
Paul Leon
METHOD FOR EVALUATING THE SURFACE CONDITION OF AN ELECTRODE OF A POINT WELDING MACHINE AND POINT WELDING MACHINE USING SUCH A METHOD
Also Published As
Publication number
Publication date
DE2044331A1
(en)
1971-03-18
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Legal Events
Date
Code
Title
Description
1973-10-10
PS
Patent sealed
1980-04-16
PCNP
Patent ceased through non-payment of renewal fee
