Ultrasonic particle measurement
Turbidimetry is based on an optical effect, therefore the ultrasonic reflection measurement is strictly spooken not a turbidity measurement. Ultrasonic pulses are transmitted into the measured liquid. Particles inside the liquid reflect this pulses. The particle concentration is calculated by intensity and quantity of the reflected pulses. This method offers some advantages compared with the method of the classical optical turbidimeters. Examples are measurements in opague liquids, or liquids which will cause extreme coatings at the measurement windows of optical turbimeters (mineralic coatings at oil in condensate measurements, oil and fat coatings if you measure oil in water or particle detection in black ink).
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