GB601490A - Improvements in or relating to apparatus for measuring the thickness of non-magneticcoatings on magnetic articles - Google Patents
Improvements in or relating to apparatus for measuring the thickness of non-magneticcoatings on magnetic articlesInfo
- Publication number
- GB601490A GB601490A GB2570045A GB2570045A GB601490A GB 601490 A GB601490 A GB 601490A GB 2570045 A GB2570045 A GB 2570045A GB 2570045 A GB2570045 A GB 2570045A GB 601490 A GB601490 A GB 601490A
- Authority
- GB
- United Kingdom
- Prior art keywords
- magnetic
- polepieces
- thickness
- coil
- coating
- 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
- 239000011248 coating agent Substances 0.000 abstract 4
- 238000000576 coating method Methods 0.000 abstract 4
- 230000001419 dependent Effects 0.000 abstract 2
- 230000004907 flux Effects 0.000 abstract 2
- 239000000696 magnetic material Substances 0.000 abstract 1
- 238000005259 measurement Methods 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
- G01B7/10—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance
- G01B7/105—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance for measuring thickness of coating
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
601,490. Magnetic tests and measurements. GENERAL ELECTRIC CO., Ltd., TURNER, H. C., HARTLAND, G. W., and LEONARD, J. L. Oct. 3, 1945, No. 25700. [Class 37] The thickness of non-magnetic coatings on magnetic materials is measured by apparatus comprising a single pair of polepieces 2, 3, Fig. 1, in the air-gap of which a coil 1 energized from a D.C. source 11, 12 is movable. One or both the polepieces have an extension 7, 8 adapted to be placed upon the non-magnetic coating under test, and one or both polepieces is/are magnetically polarized so that the flux passing across the air gap and hence the deflection of the spring-biassed coil 1 is dependent upon the thickness of the non-magnetic coating. As shown, the polarization is effected by coils 9, 10 energized from the same D.C. supply 11, 12, but, alternatively, a permanent magnet. Fig. 2 (not shown) may be used. Fig. 3 shows an arrangement where the polepieces 2, 3 are polarized by permanent magnets 18, 19, magnetic shunts 20, 21 being adjusted until normally no flux links the coil 1. When the single polar extension 7 is then placed on a non-magnetic coating the magnetic balance is upset and a deflection produced dependent on the coating thickness. The moving coil current or, according to the Provisional Specification, the polarizing current may be adjustable for setting purposes. Specification 378,983 is referred to.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB601490A true GB601490A (en) | 1948-05-06 |
Family
ID=1739431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2570045A Expired GB601490A (en) | 1945-10-03 | Improvements in or relating to apparatus for measuring the thickness of non-magneticcoatings on magnetic articles |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB601490A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2609420A (en) * | 1949-07-15 | 1952-09-02 | British Iron Steel Research | Device for measuring the thickness of steel plates and the like |
| US2721973A (en) * | 1952-01-04 | 1955-10-25 | Vickers Electrical Co Ltd | Magnetic testing device |
| DE946188C (en) * | 1954-09-18 | 1956-07-26 | Max Baermann | Device for length measurement |
| US3440527A (en) * | 1965-07-19 | 1969-04-22 | Erich Steingroever | Magnetic thickness gauge having shielded magnet |
-
1945
- 1945-10-03 GB GB2570045A patent/GB601490A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2609420A (en) * | 1949-07-15 | 1952-09-02 | British Iron Steel Research | Device for measuring the thickness of steel plates and the like |
| US2721973A (en) * | 1952-01-04 | 1955-10-25 | Vickers Electrical Co Ltd | Magnetic testing device |
| DE946188C (en) * | 1954-09-18 | 1956-07-26 | Max Baermann | Device for length measurement |
| US3440527A (en) * | 1965-07-19 | 1969-04-22 | Erich Steingroever | Magnetic thickness gauge having shielded magnet |
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