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Ultrasonic wave propagation in powders

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Figure

Figure 1. Ultrasonic wave propagation in free flowing (a) and caked (b) powder. In comparison with caked powder (b), the ultrasonic signal takes longer to propagate in the free flowing powder (a) due to air gaps between particles
Figure 2.  Ultrasonic transducers in contact with caked powder to measure sound velocity and attenuation
Figure 3.  Non-contact airborne ultrasound transducers transmitting and receiving ultrasonic signal from the surface of LAS flake powder surface
Figure 5. Ultrasonic velocity measurements obtained by the system shown in figure 2. The sound speed is low in wetted powder whilst it dramatically rises in the dried powder
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