GB538988A - Method of and device for electrically measuring the thickness of foils and sheet metals - Google Patents
Method of and device for electrically measuring the thickness of foils and sheet metalsInfo
- Publication number
- GB538988A GB538988A GB269040A GB269040A GB538988A GB 538988 A GB538988 A GB 538988A GB 269040 A GB269040 A GB 269040A GB 269040 A GB269040 A GB 269040A GB 538988 A GB538988 A GB 538988A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resistance
- foil
- thickness
- temperature
- motor
- 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
- 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
538,988. Determining dimensions of materials; resistance measurements ; compensating for temperature errors. URMENYI, L. Feb. 12, 1940, No. 2690. [Class 37] In apparatus for measuring the thickness of foil or sheet metal by placing it between a primary coil excited by A.C. and a secondary coil and measuring the alteration of the secondary voltage due to eddy currents in the foil, changes in the temperature of the foil are compensated for by measuring the temperature of the foil electrically and correspondingly altering a compensating current or voltage. This is effected by an additional displacement of the regulating member by which the apparatus can be set for any foil thickness. As shown in Fig. 1 a resistance 16 of copper or other material of high temperature coefficient and resistances 14, 15, 17, 20 of material of low temperature coefficient such as constantan are arranged in a bridge circuit fed with A.C. from a transformer 34. The resistance 16 is placed near the foil to be measured. The sliding contact 24 of the resistance 17 is regulated by a reversible motor 21 so as to balance the bridge. The sliding contact 24 and the opposite carrier 23 of the bridge are connected through an amplifier 40 to the rotor of the motor 21, the stator being fed from the transformer 34. The regulating member 10, Fig. 2, consists of a metal screen movable between two coils, of which one, 1, is shown, by means of worm gear 25, 36. Its position is indicated on a scale 26 calibrated in foil thickness. A switch 39 is simultaneously operated by gearing 33 and regulates resistances 19, 191, 19<2> in parallel with sections of the resistance 17 and a parallel resistance 18. If the temperature of the foil being measured varies the resistance 16 changes and the bridge becomes unbalanced. The motor 21 then varies the resistance 17 to restore the balance. The resistance 17 is mounted on the edge of a disc on a spindle driven by the motor 21 as shown in Fig. 2. Rotation of this spindle simultaneously displaces the screen 10 by longitudinally displacing the spindle 27, the scale 26 not being displaced. Specification 537,551, [Group XXXV], is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB269040A GB538988A (en) | 1940-02-12 | 1940-02-12 | Method of and device for electrically measuring the thickness of foils and sheet metals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB269040A GB538988A (en) | 1940-02-12 | 1940-02-12 | Method of and device for electrically measuring the thickness of foils and sheet metals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB538988A true GB538988A (en) | 1941-08-25 |
Family
ID=9744073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB269040A Expired GB538988A (en) | 1940-02-12 | 1940-02-12 | Method of and device for electrically measuring the thickness of foils and sheet metals |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB538988A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3651398A (en) * | 1967-10-19 | 1972-03-21 | Laszlo Urmenyi | Method of and device for continuously measuring the thickness of electrically conductive moving sheet material and compensating said measurement for sheet temperature |
| US4125807A (en) * | 1976-07-03 | 1978-11-14 | Elektro-Physik | Magnetic thickness gauge having convertible scales |
-
1940
- 1940-02-12 GB GB269040A patent/GB538988A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3651398A (en) * | 1967-10-19 | 1972-03-21 | Laszlo Urmenyi | Method of and device for continuously measuring the thickness of electrically conductive moving sheet material and compensating said measurement for sheet temperature |
| US4125807A (en) * | 1976-07-03 | 1978-11-14 | Elektro-Physik | Magnetic thickness gauge having convertible scales |
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