GB575463A - Improvements in and relating to means for the measurement of magnetic field intensities - Google Patents
Improvements in and relating to means for the measurement of magnetic field intensitiesInfo
- Publication number
- GB575463A GB575463A GB506444A GB506444A GB575463A GB 575463 A GB575463 A GB 575463A GB 506444 A GB506444 A GB 506444A GB 506444 A GB506444 A GB 506444A GB 575463 A GB575463 A GB 575463A
- Authority
- GB
- United Kingdom
- Prior art keywords
- disc
- solenoids
- balance
- vertical
- wires
- 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
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/028—Electrodynamic magnetometers
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
575,463. Magnetic measurements. HUGHES & SON, Ltd., H., SMITH, E., and HUGHES, A. J. March 18, 1944, No. 5064. [Class 37] A square alternating current bridge network having arms composed of nickel iron alloy wires, as described in Specification 563,522 is arranged for the measurement of the total field intensity and the two rectangular components thereof by surrounding the alloy wires by solenoids through which a measured direct current may be passed. The four wires d of magnetically sensitive alloy are arranged at right angles to form a bridge network to one diagonal of which an alternating current source z is connected. The other diagonal is connected to an amplifier and indicating instrument u. Solenoids f<1>, f<2>, f<3>, f<4> surround the wires d and opposite pairs are connected in series so as to produce magnetic fields in the same direction. Energising current for the solenoids f<1>, f<4> is supplied by a battery n and can be varied by an adjustable resistance o and a reversing switchp. Measurement is effected by apotentiometer comprising a standard cell g. resistances r, r<1>, r<2> and a galvanometer s. The solenoids f<1>,f<4>arewound on tubes enclosing the alloy wires d and are mounted in grooves in an insulating disc arranged to be adjustable about vertical and horizontal axes, one parallel pair being mounted on one side of the disc and the other pair on the other side. Each alloy wire d is supported in a straight groove in which it is disposed without constraint. The disc is enclosed in a polished non-magnetic metal case with a lining of cork, baize, felt or other thermal insulator. To measure the total field intensity the disc is set in a vertical plane parallel to the magnetic meridian and the bridge is balanced by turning about the horizontal axis. A measured current is then passed through the solenoids f<1>, f<4>, and the disc is rotated to restore balance. The total field intensity may then be deduced from the amount of this adjustment and the value of the current. To compensate for mechanical imperfections the switch p is reversed and the amount of rotation of the disc in the opposite direction for balance is observed. The mean of the readings in opposite directions is used. To measure the vertical component the disc is set in a vertical plane perpendicular to the magnetic meridian with the pivotal axis vertical and balanced. The solenoids are energised and the balance is restored by rotation in the meridian plane, the switch p is reversed and balance again restored, the mean of the angular adjustment being taken and used to calculate the vertical component. For measuring the horizontal component the apparatus is similarly set up, restoration of balance being effected by rotation in azimuth.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB506444A GB575463A (en) | 1944-03-18 | 1944-03-18 | Improvements in and relating to means for the measurement of magnetic field intensities |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB506444A GB575463A (en) | 1944-03-18 | 1944-03-18 | Improvements in and relating to means for the measurement of magnetic field intensities |
Publications (1)
Publication Number | Publication Date |
---|---|
GB575463A true GB575463A (en) | 1946-02-19 |
Family
ID=9789069
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB506444A Expired GB575463A (en) | 1944-03-18 | 1944-03-18 | Improvements in and relating to means for the measurement of magnetic field intensities |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB575463A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109407020A (en) * | 2018-12-18 | 2019-03-01 | 中国工程物理研究院流体物理研究所 | A kind of magnetic axis measuring system of the solenoid coil based on suspension method |
-
1944
- 1944-03-18 GB GB506444A patent/GB575463A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109407020A (en) * | 2018-12-18 | 2019-03-01 | 中国工程物理研究院流体物理研究所 | A kind of magnetic axis measuring system of the solenoid coil based on suspension method |
CN109407020B (en) * | 2018-12-18 | 2023-10-20 | 中国工程物理研究院流体物理研究所 | Magnetic axis measurement system of solenoid coil based on suspension wire method |
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