1 / 10

Small Field

Small Field. TMF 2004 Gymnasium Elišky Krásnohorské. Magnetic needle. magnetic needle indicate direction of magnetic field vector ideal needle is movable in all directions measuring vertical and horizontal part, then calculation resultant. Measuring magnetic induction.

elvina
Download Presentation

Small Field

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Small Field TMF 2004 Gymnasium Elišky Krásnohorské

  2. Magnetic needle • magnetic needle indicate direction of magnetic field vector • ideal needle is movable in all directions • measuring vertical and horizontal part, then calculation resultant

  3. Measuring magnetic induction • direct force measuring is not ideal • using secondary field • constant field, measuring angle size • constant angle, variable magnetic field

  4. Secondary field generators • generated field must be homogenous • solenoids aren´t right – we cann´t direct see deflection of needle • preferable are Helmholtz coils with adequate dimensions

  5. Used Helmholtz coils

  6. Scheme of Helmholtz coils

  7. Equation • Bx - magnetic induction • n - count of turns • r - radius of coils • d - distance of coils • I – leak curent •  - absolute permeability

  8. Numeric calculation • Bx - magnetic induction • n - count of turns (10) • r - radius of coils (0,1 m) • d - distance of coils (0, 14 m) • I – leak current (0,404 A) •  - absolute permeability (1,257.10-6 H.m-1)

  9. Result • measured horizontal part of magnetic induction is 27,92 μT • general value for middle Europe is 20,26 μT • vertical part wasn`t measured (we didn`t have a vertical magnetic needle) – but in the middle Eurepa is important

  10. Other methods for measuring small magnetic fields • proton precission magnetometers • optically pumped magnetometers • overhauser magnetometers • fluxgate magnetometers

More Related