APPARATUS AND METHOD FOR MEASURING DYNAMIC TORQUE FOR DETERMINING FREQUENCY-DEPENDENT SHEAR IN VISCOELASTIC MATERIALS
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United States of America Patent
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Issued Date -
May 30, 2024
app pub date -
Nov 29, 2023
filing date -
Nov 29, 2022
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Abstract
Embodiments relate to an apparatus and method for determining the complex shear modulus of compliant viscoelastic specimens. The apparatus comprises at least one magnet configured to provide a magnetic field; a specimen and a motor secured to the end of the specimen, wherein the motor is positioned proximate to the magnet such that the motor is in the magnetic field; a first coil fixed to the motor; an amplifier configured to provide a current in the first coil, such that the first coil interacts with the magnetic field and the current to apply a force to the specimen; a second coil fixed to the motor and configured to measure voltage; a mirror secured to the motor; a laser source focused on the mirror and configured to produce a laser, such that the mirror reflects the laser; and a photodetector configured to detect the laser reflected from the mirror.
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