CPC A61B 8/12 (2013.01) [A61B 5/126 (2013.01); A61B 8/085 (2013.01); A61B 8/4427 (2013.01); A61B 8/4444 (2013.01); A61B 8/488 (2013.01); A61B 8/5223 (2013.01)] | 20 Claims |
1. A device for characterizing a surface, the device comprising:
an excitation generator configured to produce an excitation comprising a pressure modulation in air for application to the surface to cause a displacement;
a transducer configured to transmit acoustic waves through the air and towards the surface during a transmit interval and to receive reflected acoustic waves from the surface during a receive interval;
a phase and amplitude detector configured to receive a phase and an amplitude of the reflected acoustic waves, compare a phase of the transmitted acoustic waves to the phase of the reflected acoustic waves, and generate a phase output; and
a response analyzer configured to compare the phase output to the excitation and determine one or more of a viscosity of a fluid adjacent to the surface or a mobility of the surface based on the comparison.
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