Extension of remote distance of electromagnetically spinning viscometer

Abstract An electromagnetically spinning (EMS) viscometer enables the remote sensing of rheological properties. To date, the distance of remote sensing of EMS system has been limited by the aperture size of rotating magnets, which drive the rotation of the metal viscosity probe through electromagnetic interactions. In this study, we develop a new device that can extend the remote distance. The extender is composed of a pair of freely rotating magnets set in a confined sample container, which rotates synchronously to the main driving magnets and applies torque to the probe above the extender. The remote distance is successfully extended up to 100 mm. We carried out the viscosity measurement for lowly viscous samples and examined that the EMS system equipped with a remote distance extender works as a viscometer with a measurement accuracy of 1%.