Gas Bubble Detection in Fluid Lines by Means of Pulsed Doppler Ultrasound

Abstract

A pulsed Doppler instrument running at 1.5 MHz resonance frequency was used for detection of microbubbles within a recirculating fluid line. Glass beads of nominal 200 micron were injected to get a statistical calibration level of the set-up. This is achieved by identifying the peak intensity of the bubble size histogram which reflected the microsphere size.