NMR Lens – Mapping of the Magnetic Field

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26220%2F13%3APU105625" target="_blank" >RIV/00216305:26220/13:PU105625 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

NMR Lens – Mapping of the Magnetic Field

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

NMR Lens – Mapping of the Magnetic Field

Popis výsledku anglicky

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.

Druh

D - Stať ve sborníku

CEP obor

JA - Elektronika a optoelektronika, elektrotechnika

OECD FORD obor

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Projekt

<a href="/cs/project/GA13-09086S" target="_blank" >GA13-09086S: Výzkum umělých elektromagnetických materiálů a metamateriálů s užitými numerickými a zobrazovacími metodami</a><br>

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2013

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

The Electromagnetics Academy PIERS 2013

ISBN

978-1-934142-20-2

ISSN

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e-ISSN

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Počet stran výsledku

5

Strana od-do

900-904

Název nakladatele

PIERS

Místo vydání

Neuveden

Místo konání akce

Stockholm

Datum konání akce

12. 8. 2013

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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