Ultrasonic device and detection chamber. ⟨v⟩ stands for fluid velocity and arrows inside the pipe indicate flow direction.
Ultrasonic device geometry, as considered in the calculation of the ultrasonic field.
Simulation of the ultrasonic spot produced by the 1 mm/±30° focused sensor at 350 MHz.
(a) Contour plot of the ultrasonic spot at −3, −6, and −20 dB. (b) Simulated field profile in the focal plane (at 1040 μm from the lens).
Experimental field profile (normalized amplitude).
Multiple echoes from a single particle crossing the ultrasonic spot at constant speed ⟨v⟩.
Example of an echographic signal.
(a) Overview of the inline high frequency ultrasonic particle sizer. (b) A typical echo reflected by a particle (A) and its shaped pulse (B).
Calibration of the system. Average number of pulses per burst versus diameter of standard particles in μm.
Optical microscope size analysis of two samples of PMMA spheres.
Ultrasonic N tp distribution law for the 100–200 μm and 200–300 μm PMMA mixed samples.
Correlation between optical and ultrasonic measurements according to the calibration curve.
Ultrasonic (a) and optical distributions (b) for the unknown sample.
Temporal evolution of N tp in the presence of aggregates in the suspension.
Changes in the N tp distribution due to the presence of aggregates.
Simulated and experimental ultrasonic field characteristics.
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