NMR Lens – Mapping of the Magnetic Field

článek ve sborníku ve WoS nebo Scopus

angličtina

Electromagnetic field is possible to manipulate by means of dielectric materials. Electromagnetic field will be affected due to values of dielectric constant er and permeability mr. The lens was constructed as periodic structure of single split ring resonators (SSR). A negative effective permeability mr can be imposed on this structure. The main problem is to set up the resonance frequencies of the resonators. The resonance frequency is very sensitive and it is possible to very easily change it by the interaction with others resonators or by the interactions with objects in the surrounding area (parts of the NMR system, measured object, probe sensors etc). This is the reason, why is so complicated to set resonant frequency exactly. NMR system has one disadvantage and that it is no possible to change frequency of the RF electromagnetic field. So it is impossible to find out resonant frequency of the resonators interaction with NMR system and eventually with measured object. This paper contains measurement methodology for mapping of the magnetic flux density in the reactive field of the resonators. Measuring workplace simulates RF electromagnetic field in NMR system with frequency sweeping possibility. This makes it possible to monitor manipulation of the magnetic field and dependence of the resonant frequency of the resonators interacting with surrounding objects.

NMR, NMR lens, metamaterials, FM analysis

NEŠPOR, D.; KŘÍŽ, T.; KUBÁSEK, R.; FIALA, P.

2013

12. 8. 2013

PIERS

978-1-934142-20-2

The Electromagnetics Academy PIERS 2013

900

904

5