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Apparatus for measuring viscoelastic properties over ten decades: Refinements
Review of Scientific Instruments
This article describes refinements to an instrument for determining the viscoelastic properties of a solid material isothermally, with a single apparatus, over 10 decades of time and frequency. Torque is applied electromagnetically to a specimen fixed at one end. Specimen deformation is determined via a laser beam reflected from the other end upon a split diode detector. Phase resolution is improved by the use of a lock in amplifier at high frequency and by the use of Lissajous figures todoi:10.1063/1.1146101 fatcat:itg5nvd2gjblbajewda2trahli