GB1067764A - Method and apparatus for determining hardness of ferromagnetic material - Google Patents
Method and apparatus for determining hardness of ferromagnetic materialInfo
- Publication number
- GB1067764A GB1067764A GB1850664A GB1850664A GB1067764A GB 1067764 A GB1067764 A GB 1067764A GB 1850664 A GB1850664 A GB 1850664A GB 1850664 A GB1850664 A GB 1850664A GB 1067764 A GB1067764 A GB 1067764A
- Authority
- GB
- United Kingdom
- Prior art keywords
- head
- hardness
- signal
- erase
- picked
- 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
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)
Abstract
1,067,764. Measuring hardness of ferromagnetic material. ASSEMBLY PRODUCTS Inc. May 4, 1964, No. 18506/64. Heading G1N. An apparatus for testing the hardness of a moving strip of magnetic material comprises a magnetizing head 12 (Fig. 2) and a pick up head 13, whereby the retentivity of .the material is determined as a measure of its hardness, the greater the retentivity the greater the hardness. The strip 10 is magnetized in spots by the magnetizing head 12 which is energized in pulses by a constant frequency A. C. source, e. g. at 40 cycles, in the form of a pulse generator. At a second location the pick up head 13 receives signals induced therein by the retained magnetic field; the signals are amplified, filtered to remove those not at the pulsed frequency, rectified and fed to a modulator. An erase head 15, powered by D. C. or relatively high frequency current, is provided and the degree of erasing is modulated by the integrated picked up signal so that as the signal becomes larger the erase field becomes stronger tending to reduce the picked up signal to its original level, and is in effect a negative feedback arrangement. The amount of feedback is measured on a meter 14 and is taken as a measure of hardness. The erase field compensates for inadvertent change in distance between the head 13 and the strip. For instance as the distance increases the picked up signal weakens, the erase field weakens tending to restore the picked up signal. In a further embodiment Figs. 3, 4 (not shown), so that change in distance between the head 12 and the strip may be compensated for, the erase coil is wound on the same core as the magnetizing head coil. The measured value may be used for process control.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1850664A GB1067764A (en) | 1964-05-04 | 1964-05-04 | Method and apparatus for determining hardness of ferromagnetic material |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1850664A GB1067764A (en) | 1964-05-04 | 1964-05-04 | Method and apparatus for determining hardness of ferromagnetic material |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1067764A true GB1067764A (en) | 1967-05-03 |
Family
ID=10113603
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1850664A Expired GB1067764A (en) | 1964-05-04 | 1964-05-04 | Method and apparatus for determining hardness of ferromagnetic material |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1067764A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2529341A1 (en) * | 1982-06-23 | 1983-12-30 | Inst Prikladnoi Fiziki Akademi | Ferromagnetic object mechanical characteristics monitor - integrates signal of coil sensing residual field due to two opposed pulsed coils located along object |
FR2533703A1 (en) * | 1982-09-23 | 1984-03-30 | Inst Prikladnoi Fiziki Akademi | Method and device serving to determine the mechanical properties of products in ferromagnetic material |
FR2642171A1 (en) * | 1988-12-21 | 1990-07-27 | Inst Prikladnoi Fiziki Akademi | DEVICE FOR MEASURING THE PARAMETERS OF FERROMAGNETIC PRODUCTS IN MOTION |
GB2260413A (en) * | 1991-10-11 | 1993-04-14 | Mohammad Javad Birjandi | Monitoring magnetic fields |
-
1964
- 1964-05-04 GB GB1850664A patent/GB1067764A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2529341A1 (en) * | 1982-06-23 | 1983-12-30 | Inst Prikladnoi Fiziki Akademi | Ferromagnetic object mechanical characteristics monitor - integrates signal of coil sensing residual field due to two opposed pulsed coils located along object |
FR2533703A1 (en) * | 1982-09-23 | 1984-03-30 | Inst Prikladnoi Fiziki Akademi | Method and device serving to determine the mechanical properties of products in ferromagnetic material |
FR2642171A1 (en) * | 1988-12-21 | 1990-07-27 | Inst Prikladnoi Fiziki Akademi | DEVICE FOR MEASURING THE PARAMETERS OF FERROMAGNETIC PRODUCTS IN MOTION |
GB2260413A (en) * | 1991-10-11 | 1993-04-14 | Mohammad Javad Birjandi | Monitoring magnetic fields |
GB2260413B (en) * | 1991-10-11 | 1996-04-24 | Mohammad Javad Birjandi | Search coil for detecting magnetic field components |
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