The sphere rheometer: I. Quasistatic measurements

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Abstract
A new type of rheometer capable of measuring local viscosity as well as elasticity of translucent medium is described. This apparatus uses a magnetic sphere maintained in levitation by a magnetic field. The measurement of the reaction force exerted on the sphere when a straining field is induced around the sphere allows one to measure the rheological parameters of the medium with an accuracy of 3% for a large range of variation of elasticity and viscosity. Examples are provided for different classes of mediums.

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