GB693675A - Magnetic instruments for measuring the thickness of thin films - Google Patents
Magnetic instruments for measuring the thickness of thin filmsInfo
- Publication number
- GB693675A GB693675A GB23707/51A GB2370751A GB693675A GB 693675 A GB693675 A GB 693675A GB 23707/51 A GB23707/51 A GB 23707/51A GB 2370751 A GB2370751 A GB 2370751A GB 693675 A GB693675 A GB 693675A
- Authority
- GB
- United Kingdom
- Prior art keywords
- magnet
- measuring
- thickness
- pull
- spring
- 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
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
693,675. Magnetic measurements. BERTHOLD, R. Oct. 11, 1951 [April 5, 1949], No. 23707/51. Class 37. In an instrument for measuring the thickness of non-ferromagnetic films on a ferromagnetic base by the pull of a permanent bar magnet suspended on a spring, the magnet is fitted with a pole shoe of highly permeable non-retentive material. A permanent magnet 1 is fitted with a pole shoe 2 and is employed for measuring the thickness of a non-ferromagnetic layer on a ferromagnetic base 3. The magnet hangs from a balance beam and is pulled away from the layer by a spiral spring wound about the pivotal axis of the beam. The spring is tensioned by winding up the end not attached to the beam, the amount of winding measuring the pull of the magnet. The pole shoes 2 may be spherically curved at the end, as shown in Fig. 1. Alternative forms of shoe are shown in Figs. 2 and 3. For measuring thick layers both ends of the magnet are fitted with pole shoes as shown in Fig. 4, the magnet system being pivoted so that the measurement is not affected by uneven withdrawal of the magnet from the base. By means of a locking rest the spring tensioning means may be held in the position it has reached when the magnet pulls away from the test-piece. The notches of this rest may be unevenly spaced to correspond with the non-linear dependence of pull on thickness of film. Readily interchangeable permanent magnets of different strength may be provided for different ranges of measurement.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE693675X | 1949-04-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB693675A true GB693675A (en) | 1953-07-01 |
Family
ID=6605092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB23707/51A Expired GB693675A (en) | 1949-04-05 | 1951-10-11 | Magnetic instruments for measuring the thickness of thin films |
Country Status (2)
| Country | Link |
|---|---|
| BE (1) | BE514302A (en) |
| GB (1) | GB693675A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3716779A (en) * | 1971-02-01 | 1973-02-13 | Otdel Fiz Nerazrushajuschego | Magnetic spring-controlled winding apparatus for gaging the thickness of non-magnetic coatings on metal products |
| CN110160480A (en) * | 2019-05-31 | 2019-08-23 | 湖南科美达电气股份有限公司 | A kind of device and test method measuring absorbate average airgap |
-
0
- BE BE514302D patent/BE514302A/xx unknown
-
1951
- 1951-10-11 GB GB23707/51A patent/GB693675A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3716779A (en) * | 1971-02-01 | 1973-02-13 | Otdel Fiz Nerazrushajuschego | Magnetic spring-controlled winding apparatus for gaging the thickness of non-magnetic coatings on metal products |
| CN110160480A (en) * | 2019-05-31 | 2019-08-23 | 湖南科美达电气股份有限公司 | A kind of device and test method measuring absorbate average airgap |
Also Published As
| Publication number | Publication date |
|---|---|
| BE514302A (en) |
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