论文标题
紧凑型永久磁铁，用于微流NMR释放计
A Compact Permanent Magnet for Microflow NMR Relaxometry
论文作者
论文摘要
我们设计并展示了一个紧凑，健壮且易于组装和调谐的永久磁铁，适用于微流动流的NMR弛豫测量值。磁铁气瓶内包含的软磁性不锈钢板是获得显着改善且可调的场均匀性的关键。对于不同的NMR探针大小，具有合适的场均匀性区域（小于200 ppm）可扩展设计，可在毛细管长度约为总磁铁长度的50％的情况下实现。建造的物理原型，尺寸为3.5x3.5x8.0 cm3和5毫米高气囊，可提供0.5吨的场强，并且足够的田间均匀性，用于毛细管的NMR松弛测量值，最高可达1.6 mm。和20毫米长。磁铁用于在0.001 mL/min到20 mL/min的宽范围内进行测试流速测量。
We design and demonstrate a compact, robust and simple to assemble and tune permanent magnet suitable for NMR relaxometry measurements of microfluidic flows. Soft-magnetic stainless steel plates, incorporated inside the magnet airgap, are key for obtaining substantially improved and tunable field homogeneity. The design is scalable for different NMR probe sizes with the region of suitable field homogeneity, less than 200 ppm, achievable in a capillary length of about 50% of the total magnet length. The built physical prototype, having 3.5x3.5x8.0 cm3 in size and 5 mm high airgap, provides a field strength of 0.5 T and sufficient field homogeneity for NMR relaxometry measurements in capillaries up to 1.6 mm i.d. and 20 mm long. The magnet was used for test flow rate measurements in a wide range, from 0.001 ml/min to 20 ml/min.
