Fig. 1: Working principle of ultrasonic fluid bubble detection for small pipes.
From: Noninvasive fluid bubble detection based on capacitive micromachined ultrasonic transducers
a Schematic of ultrasound wave propagation without air bubbles. b Schematic of ultrasound wave propagation with air bubbles. c Principal schematic for acoustic pressure analysis. d Geometry schematic for analysis of the projection area of air bubbles
