Fig. 1. (Color online) (a) Illustration of the measurement setup. The red line indicates the propagation path of the probing light, which is emitted from the surface light source (wavelength: 530 nm). The light is polarized to left circular polarization and incident on the optical indicator. The reflected light from the optical indicator changes to elliptical polarization due to the photo-elastic effect on the glass substrate. This light then passes through the analyzer and is imaged by a CCD camera. The microwave is generated and amplified by a microwave signal generator and power amplifier. The amplified microwave is transferred to an open-ended waveguide through coaxial cables and radiates from the open part of the waveguide to a dielectric tube. (b) Photographs of the backside view of a sample section of the measurement setup. (c) Photographs of a side view of the measurement setup. (d) photographs of the WE mixture samples.
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