GB1604188A - Method and apparatus for testing ferromagnetic workpieces - Google Patents
Method and apparatus for testing ferromagnetic workpieces Download PDFInfo
- Publication number
- GB1604188A GB1604188A GB19040/78A GB1904078A GB1604188A GB 1604188 A GB1604188 A GB 1604188A GB 19040/78 A GB19040/78 A GB 19040/78A GB 1904078 A GB1904078 A GB 1904078A GB 1604188 A GB1604188 A GB 1604188A
- Authority
- GB
- United Kingdom
- Prior art keywords
- workpiece
- field strength
- voltage
- coil
- magnetic field
- 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
Links
- 238000012360 testing method Methods 0.000 title claims description 18
- 238000000034 method Methods 0.000 title claims description 12
- 230000005294 ferromagnetic effect Effects 0.000 title claims description 11
- 230000005291 magnetic effect Effects 0.000 claims description 37
- 230000035699 permeability Effects 0.000 claims description 21
- 230000004907 flux Effects 0.000 claims description 14
- 230000008859 change Effects 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 claims description 7
- 230000001419 dependent effect Effects 0.000 claims description 6
- 230000035945 sensitivity Effects 0.000 claims description 4
- 238000010998 test method Methods 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 2
- 238000004804 winding Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
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
-
- 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
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)
- Measuring Magnetic Variables (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7705299A NL7705299A (nl) | 1977-05-13 | 1977-05-13 | Werkwijze en inrichting voor het onderzoek van ferromagnetische werkstukken. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1604188A true GB1604188A (en) | 1981-12-02 |
Family
ID=19828549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB19040/78A Expired GB1604188A (en) | 1977-05-13 | 1978-05-11 | Method and apparatus for testing ferromagnetic workpieces |
Country Status (12)
| Country | Link |
|---|---|
| JP (1) | JPS53141686A (de) |
| BR (1) | BR7802982A (de) |
| DD (1) | DD135539A5 (de) |
| DE (1) | DE2820559A1 (de) |
| ES (1) | ES469764A1 (de) |
| FI (1) | FI781482A (de) |
| FR (1) | FR2390728A1 (de) |
| GB (1) | GB1604188A (de) |
| IT (1) | IT1112654B (de) |
| NL (1) | NL7705299A (de) |
| SE (1) | SE7805243L (de) |
| ZA (1) | ZA782413B (de) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4503393A (en) * | 1981-10-05 | 1985-03-05 | Exxon Production Research Co. | Method and apparatus for detecting flaws in the threaded end of an elongate member using electromagnetic excitation and an automated scanning sensor |
| US4510447A (en) * | 1981-10-26 | 1985-04-09 | Exxon Production Research Co. | Inspection apparatus for electromagnetically detecting flaws in the wall of a pipe |
-
1977
- 1977-05-13 NL NL7705299A patent/NL7705299A/xx not_active Application Discontinuation
-
1978
- 1978-01-30 IT IT19761/78A patent/IT1112654B/it active
- 1978-04-27 ZA ZA00782413A patent/ZA782413B/xx unknown
- 1978-05-09 SE SE7805243A patent/SE7805243L/xx not_active Application Discontinuation
- 1978-05-10 FI FI781482A patent/FI781482A/fi not_active Application Discontinuation
- 1978-05-11 DE DE19782820559 patent/DE2820559A1/de not_active Withdrawn
- 1978-05-11 BR BR7802982A patent/BR7802982A/pt unknown
- 1978-05-11 JP JP5506178A patent/JPS53141686A/ja active Pending
- 1978-05-11 GB GB19040/78A patent/GB1604188A/en not_active Expired
- 1978-05-12 FR FR7814312A patent/FR2390728A1/fr active Pending
- 1978-05-12 ES ES469764A patent/ES469764A1/es not_active Expired
- 1978-05-16 DD DD78205397A patent/DD135539A5/de unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4503393A (en) * | 1981-10-05 | 1985-03-05 | Exxon Production Research Co. | Method and apparatus for detecting flaws in the threaded end of an elongate member using electromagnetic excitation and an automated scanning sensor |
| US4510447A (en) * | 1981-10-26 | 1985-04-09 | Exxon Production Research Co. | Inspection apparatus for electromagnetically detecting flaws in the wall of a pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| IT7819761A0 (it) | 1978-01-30 |
| SE7805243L (sv) | 1978-11-14 |
| FI781482A (fi) | 1978-11-14 |
| DD135539A5 (de) | 1979-05-09 |
| ES469764A1 (es) | 1979-10-01 |
| IT1112654B (it) | 1986-01-20 |
| NL7705299A (nl) | 1978-11-15 |
| JPS53141686A (en) | 1978-12-09 |
| BR7802982A (pt) | 1979-01-02 |
| ZA782413B (en) | 1979-04-25 |
| DE2820559A1 (de) | 1978-11-23 |
| FR2390728A1 (fr) | 1978-12-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |