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A liquid lens was fabricated whose focal point can be varied in the axial and radial directions. The liquid lens consists of a cylindrical acrylic cell (inner diameter: 10 mm; thickness: 3 mm), two immiscible liquids with different refractive indices (water and silicone oil), and an annular piezoelectric lead zirconate titanate transducer with four electrodes. The oil-water interface functions as...
Observation techniques for measuring the vibration of a single microcapsule in an acoustic standing wave field were discussed. First, optical simultaneous observation of a microcapsule vibration by two methods was investigated, using a high-speed video camera, which permits two-dimensional observation of the capsule vibration, and a laser Doppler vibrometer (LDV), which can observe small capsule vibration...
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