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Inline high frequency ultrasonic particle sizer
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Image of FIG. 1.
FIG. 1.

Ultrasonic device and detection chamber. ⟨⟩ stands for fluid velocity and arrows inside the pipe indicate flow direction.

Image of FIG. 2.
FIG. 2.

Ultrasonic device geometry, as considered in the calculation of the ultrasonic field.

Image of FIG. 3.
FIG. 3.

Simulation of the ultrasonic spot produced by the 1 mm/±30° focused sensor at 350 MHz.

Image of FIG. 4.
FIG. 4.

(a) Contour plot of the ultrasonic spot at −3, −6, and −20 dB. (b) Simulated field profile in the focal plane (at 1040 m from the lens).

Image of FIG. 5.
FIG. 5.

Experimental field profile (normalized amplitude).

Image of FIG. 6.
FIG. 6.

Multiple echoes from a single particle crossing the ultrasonic spot at constant speed ⟨⟩.

Image of FIG. 7.
FIG. 7.

Example of an echographic signal.

Image of FIG. 8.
FIG. 8.

(a) Overview of the inline high frequency ultrasonic particle sizer. (b) A typical echo reflected by a particle (A) and its shaped pulse (B).

Image of FIG. 9.
FIG. 9.

Calibration of the system. Average number of pulses per burst versus diameter of standard particles in m.

Image of FIG. 10.
FIG. 10.

Optical microscope size analysis of two samples of PMMA spheres.

Image of FIG. 11.
FIG. 11.

Ultrasonic distribution law for the 100–200 m and 200–300 m PMMA mixed samples.

Image of FIG. 12.
FIG. 12.

Correlation between optical and ultrasonic measurements according to the calibration curve.

Image of FIG. 13.
FIG. 13.

Ultrasonic (a) and optical distributions (b) for the unknown sample.

Image of FIG. 14.
FIG. 14.

Temporal evolution of in the presence of aggregates in the suspension.

Image of FIG. 15.
FIG. 15.

Changes in the distribution due to the presence of aggregates.


Generic image for table
Table I.

Simulated and experimental ultrasonic field characteristics.


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Scitation: Inline high frequency ultrasonic particle sizer