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We present a flexible set-up for determining the rheology of visco-elasticmaterials which is based on the mechanical response of a magnet deposited atthe surface of a slab of material and excited electromagnetically. Aninterferometric measurement of the magnet displacement allows one to reach anexcellent accuracy over a wide range of frequency. Except for the magnet, thereis no contact between the material under investigation and the apparatus. Atlow frequency, inertial effects are negligible so that the mechanical response,obtained through a lock-in amplifier, directly gives the material complexmodulus. At high frequency, damped waves are emitted and the rheology must beextracted numerically from a theoretical model. To validate the design, theinstrument was used to measure the rheology of a test PDMS gel which presentsan almost perfect scale free response at high frequency.

A flexible rheometer design to measure the visco-elastic response of soft solids over a wide range of frequency