I have bought the final tank! Another milestone passed!
I now have two tanks, the small box that was used for the stairway experiments and the new 0.8m diameter circular tank, on the roof collecting data. The small box is still lined in the anechoic, but the large is not. Because of this, we get lots [...]
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 [...]
I have now completed the anechoic lining tests and reached an acceptable combination of materials.
To recap, over the last couple of weeks I have used an audio frequency amplifier to increase the transmit power of the pulsed tx signal. I expected this to provide poor results since the pulse was 6.6 uS long, hence providing [...]