analysis of the sound waves propagating through the water body in the water while the body is frozen

摘要

and by detecting the acoustic waves that propagate through the water body in the (i) when the water body is frozen in a structure on, resulting in a detected sound waves through it, (ii) from detecting sound waves, the frequency of (a) detecting acoustic waves method comprising and extracting the magnitude of the (b) frequency components, and components,, and, and removing the body of water from the structure when the (iii) the magnitude exceeds the threshold.