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Current source of a FFC NMR relaxometer linearly controlled
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| Author(s) |
Antonio ROQUE, Duarte SOUSA, Elmano MARGATO, Jose MAIA |
| Abstract |
A Fast Field Cycling (FFC) Nuclear Magnetic Resonance (NMR) relaxometer combines optimizedmagnets (low volume and power losses) and power apparatus that integrate power supplies and controlmethods.The magnet of a FFC NMR relaxometer determines the requirements of the main power supply. Asmain requirement, the magnet current should be controlled linearly in order to control the magnet fluxdensity. In addition, the current control should be accurate and having an adequate thermal stability.In this paper, framed by the main blocks that integrate a FFC NMR relaxometer, the topology of themagnet current source is presented. The operating modes and the control methodology are alsodescribed.Experimental results are presented validating the proposed solution according to the applicationrequirements. A power losses analysis supported by experimental results is performed for thegeneralized operating mode. |
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| Filename: | 0825-epe2013-full-19012378.pdf |
| Filesize: | 746.8 KB |
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| Type |
Members Only |
| Date |
Last modified 2014-02-09 by System |
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