GB907418A - Device for use with apparatus and apparatus for the detection of defects in metal products - Google Patents
Device for use with apparatus and apparatus for the detection of defects in metal productsInfo
- Publication number
- GB907418A GB907418A GB4434560A GB4434560A GB907418A GB 907418 A GB907418 A GB 907418A GB 4434560 A GB4434560 A GB 4434560A GB 4434560 A GB4434560 A GB 4434560A GB 907418 A GB907418 A GB 907418A
- Authority
- GB
- United Kingdom
- Prior art keywords
- output
- signal
- article
- bridge
- transformer
- 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
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
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
Landscapes
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Remote Sensing (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Immunology (AREA)
- Electromagnetism (AREA)
- General Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Pathology (AREA)
- Electrochemistry (AREA)
- Biochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geophysics (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
907,418. Detecting flaws in metal. INSTITUT DE RECHERCHES DE LA SIDERURGIE FRANCAISE. Dec. 23, 1960 [Jan. 26, 1960], No. 44345/60. Class 37. In an electrical measuring arrangement wherein the passage of an article through a measuring head gives rise to a double humped output, Fig. 2a, from a measuring bridge, a clean pulse, Fig. 2d, indicating accurately the position of the article, or of a flow in the article is obtained by using a phasesensitive detector which produces an output, Fig. 2 b, differentiating its output to obtain a signal, Fig. 2 c, and applying the signal to a threshold device. The bridge output applied to transformer 21, Fig. 3, is demodulated in diodes 23, by the bridge feed oscillations applied to transformer 22, and differentiated in an RC network 25, 26. The differentiated signal is amplified in a valve 27 and applied to a diode 28 forming a threshold device, the output level of which is adjustable by a potentiometer 29. The signal is finally passed through a D.C. amplifier to a recorder 20.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR816702A FR1255436A (en) | 1960-01-26 | 1960-01-26 | Improvements to electromagnetic devices for detecting defects in metal products |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB907418A true GB907418A (en) | 1962-10-03 |
Family
ID=8724332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4434560A Expired GB907418A (en) | 1960-01-26 | 1960-12-23 | Device for use with apparatus and apparatus for the detection of defects in metal products |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE592745A (en) |
| FR (1) | FR1255436A (en) |
| GB (1) | GB907418A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3543145A (en) * | 1967-05-25 | 1970-11-24 | Commissariat Energie Atomique | Eddy current method and apparatus for the nondestructive testing of electrically conductive tubes utilizing two mutually coupled hartley oscillators |
| US4134067A (en) * | 1977-09-09 | 1979-01-09 | The Boeing Company | Rotary eddy current flaw detector utilizing differentially unbalanced coils and the amplitude of a rotary induced pulse to produce the charging voltage for the sweep generator |
| EP0039793A2 (en) * | 1980-05-10 | 1981-11-18 | Institut Dr. Friedrich Förster Prüfgerätebau GmbH & Co. KG | Method and apparatus to read a flaw signal |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| JPS4855844A (en) * | 1971-11-19 | 1973-08-06 | ||
| DE2532328A1 (en) * | 1975-07-19 | 1977-02-03 | Hochtemperatur Reaktorbau Gmbh | METHOD AND DEVICE FOR DETECTING BODIES MADE OF ELECTRICALLY CONDUCTIVE MATERIAL |
| SE456863B (en) * | 1986-07-15 | 1988-11-07 | Toernbloms Kvalitetskontroll | MEASURING AND / OR CONTROL DEVICE Utilizing vortex flow technology with suppression of benign surface deformations |
-
1960
- 1960-01-26 FR FR816702A patent/FR1255436A/en not_active Expired
- 1960-07-07 BE BE592745A patent/BE592745A/en unknown
- 1960-12-23 GB GB4434560A patent/GB907418A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3543145A (en) * | 1967-05-25 | 1970-11-24 | Commissariat Energie Atomique | Eddy current method and apparatus for the nondestructive testing of electrically conductive tubes utilizing two mutually coupled hartley oscillators |
| US4134067A (en) * | 1977-09-09 | 1979-01-09 | The Boeing Company | Rotary eddy current flaw detector utilizing differentially unbalanced coils and the amplitude of a rotary induced pulse to produce the charging voltage for the sweep generator |
| EP0039793A2 (en) * | 1980-05-10 | 1981-11-18 | Institut Dr. Friedrich Förster Prüfgerätebau GmbH & Co. KG | Method and apparatus to read a flaw signal |
| EP0039793A3 (en) * | 1980-05-10 | 1983-04-06 | Institut Dr. Friedrich Forster Prufgeratebau Gmbh & Co. Kg | Method and apparatus to read a flaw signal |
Also Published As
| Publication number | Publication date |
|---|---|
| BE592745A (en) | 1960-10-31 |
| FR1255436A (en) | 1961-03-10 |
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