Optimized Rheo-optical Measurements Using Fast Fourier Transform and Oversampling

Optimized Rheo-optical Measurements Using Fast Fourier Transform and Oversampling

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Rheo-optics is a method that allows the analysis of optical properties, like birefringence and dichroism under steady and oscillatory shear.It is possible to correlate Bucket hats macroscopic mechanical responses with induced microscopic changes in the material.We describe how this method was improved several fold and implemented on a commercially available setup.However, the here presented ideas are applicable to any rheo-optical setup, based on modulation Washing Machine Timer Motor of the laser light.

Additionally it does not need a lock-in amplifier and therefore reduces the costs of the setup.