为小型核磁共振仪器的变温屏蔽做出贡献

IF 1.9 3区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY
Martin Bornemann-Pfeiffer, Klas Meyer, Jeremy Lademann, Matthias Kraume, Michael Maiwald
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引用次数: 0

摘要

紧凑型 NMR 仪器在热流样品或放热反应混合物中的应用受到永磁体温度敏感性的限制。通常,这种温度效应会直接影响可实现的磁场均匀性,进而影响测量质量。磁体和仪器的内部温度控制回路并非为这种温度补偿而设计。被动绝缘受限于磁体钻孔内的小尺寸。在此,我们介绍一种主动热屏蔽的设计方法,目的是使用流量和温度可变的压缩气流对台式 NMR 仪器的 NMR 样品进行可变温度控制。在系统识别和通过热成像测量表面温度的基础上,建立了模型预测控制,以尽量减少探头或样品温度对永磁体的干扰。这种方法将促进变温屏蔽的应用,从而将紧凑型 NMR 仪器的应用范围扩大到与磁体温度不同的流动样品温度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Contributions towards variable temperature shielding for compact NMR instruments

Contributions towards variable temperature shielding for compact NMR instruments

The application of compact NMR instruments to hot flowing samples or exothermically reacting mixtures is limited by the temperature sensitivity of permanent magnets. Typically, such temperature effects directly influence the achievable magnetic field homogeneity and hence measurement quality. The internal-temperature control loop of the magnet and instruments is not designed for such temperature compensation. Passive insulation is restricted by the small dimensions within the magnet borehole. Here, we present a design approach for active heat shielding with the aim of variable temperature control of NMR samples for benchtop NMR instruments using a compressed airstream which is variable in flow and temperature. Based on the system identification and surface temperature measurements through thermography, a model predictive control was set up to minimise any disturbance effect on the permanent magnet from the probe or sample temperature. This methodology will facilitate the application of variable-temperature shielding and, therefore, extend the application of compact NMR instruments to flowing sample temperatures that differ from the magnet temperature.

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来源期刊
CiteScore
4.70
自引率
10.00%
发文量
99
审稿时长
1 months
期刊介绍: MRC is devoted to the rapid publication of papers which are concerned with the development of magnetic resonance techniques, or in which the application of such techniques plays a pivotal part. Contributions from scientists working in all areas of NMR, ESR and NQR are invited, and papers describing applications in all branches of chemistry, structural biology and materials chemistry are published. The journal is of particular interest not only to scientists working in academic research, but also those working in commercial organisations who need to keep up-to-date with the latest practical applications of magnetic resonance techniques.
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