Standard magnetic levitation (MagLev) device consists of two identical square permanent magnets with like poles facing each other. Limited by the size of the permanent magnet, standard MagLev device cannot afford the levitation of samples with large size. This paper proposed a novel MagLev device using magnet arrays to replace the whole permanent magnet, which is a promising method to construct device for large-scale samples. This method is different from that used magnet arrays with N-pole and S-pole alternating arrangement. All magnets in the array are in the same direction. There is repulsive force between the magnets and a specific fixture is required to fix them. The magnetic field generated by the magnet array is similar to that of the standard magnet. In the magnetic field formed by the magnet array device, the polymer can be levitated to a balanced position in the paramagnetic solution and the levitation height is related to its density. The equation between density and levitation height can be obtained according to the simulation results. Solutions of different concentrations are used to measure different densities of polymers. The proposed method could measure all kinds of polymer with an accuracy of ±0.0003 g/cm³. The non-destructive testing could be achieved through the levitation posture of polymer parts. The use of magnet array avoids the trouble of manufacturing large magnet and makes it possible to realize the testing of polymers with a large size and industrialization of magnetic levitation detection.

标准磁悬浮 (MagLev) 设备由两个相同的方形永磁体组成，相同的磁极彼此面对。受永磁体尺寸的限制，标准 MagLev 装置无法承受大尺寸样品的悬浮。本文提出了一种使用磁体阵列代替整个永磁体的新型磁悬浮装置，是一种很有前景的大规模样品装置构建方法。这种方法不同于使用N极和S极交替排列的磁体阵列。阵列中的所有磁铁都在同一方向上。磁铁之间存在排斥力，需要特定的固定装置来固定它们。磁铁阵列产生的磁场与标准磁铁的磁场相似。在磁阵列装置形成的磁场中，聚合物可以悬浮到顺磁溶液中的平衡位置，悬浮高度与其密度有关。根据模拟结果可以得到密度与悬浮高度之间的方程。不同浓度的溶液用于测量不同密度的聚合物。所提出的方法可以测量各种聚合物，精度为±0.0003 g/cm³ . 通过聚合物零件的悬浮姿态可以实现无损检测。磁体阵列的使用避免了制造大磁体的麻烦，使实现大尺寸聚合物的检测和磁悬浮检测的产业化成为可能。