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The present study investigated the flow birefringence induced by shearcomponents along a camera's optical axis, which has been neglected inconventional theories of photoelastic measurements. Measurements were conductedfor a wide range of shear rates from a direction perpendicular to the shearusing a high-speed polarization camera and a parallel-plate-type rheometer. Themeasurement results obtained from a fluid with low viscoelasticity,specifically a dilute suspension of cellulose nanocrystals, showed that thebirefringence increases monotonically as the stress components along thecamera's optical axis increase. It was also found that the birefringence showeda power law with respect to the shear rate. This letter reports a key factrequired for polarization measurements of shear rate (shear stress) inthree-dimensional flows.

Measurement of flow birefringence induced by the shear components along the optical axis using a parallel-plate-type rheometer