High sensitivity magnetic levitation testing method by scaling up magnetic levitation device using magnet arrays

Magnetic levitation (MagLev) testing method has been proved to be an accurate and sensitive method for densitybased analysis. However, the use of permanent magnets limits its further application for large scale samples. This work proposed a method to construct large scale magnets for scaled-up MagLev device by closely aligning small magnets with the poles in the same direction. Accordingly, a method for measuring density of sophisticated parts is proposed. The sensitivity and accuracy can reach to 1949 mm cm3 g- 1 and 0.0002 g/cm3 in the measurement using 2.0 M MnCl2, which are 15.6 and 20.0 times larger than those of standard MagLev device. These advantages allow scaled-up MagLev device to accurately measure density and sensitively test minute interior defect of large parts. This approach reveals multiple possibilities in density-based applications of measurement, manipulation and non-destructive testing of large-scale parts, etc.