I have just computed the absorption coefficients for the drop impacts, instead of a pulse generation.
To do this, I imported the raw drop data into Matlab and manually set all of the areas that had any bubble noise to zero. Then I went back to my software and averaged the pulses like before. Back in matlab I filtered the average (because there was a VLF frequency that would mess up the power measurements) and calculated the mean power.
The results gave an average absorption coefficient of 0.49. A slightly better, but similar result that from yesterday. This helps to conclude the anechoic nature of the lining.
Phil
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