There are a few different things happening at the moment. Because the tank is in place and the anechoic has arrived in decent quantities I can really get cracking with some juicy work.
First off, I have started the impact detection routines and suprisingly, they are going very well. What I have to do is attempt to distinguish between impacts and bubbles and I thought I would have real problems, but initial results are promising with an 80-90% success rate. There are only a few more things to do then I should have a working prototype to test.
Impact Interpretation Algorithm Example
Secondly I am still playing with the anechoic. Specifically, altering the shape of the rubber to make triangles which in theory should help absorption and scattering, however the results are inconclusive. They seem to be showing that the unaltered flat rubber is infact better than any sculpted one! Whether this is because of a lack of aborbive material (because the triangles go all the way through) or just a fluke, I dont know so I am repeating the tests with double thickness materials to find out why!
Also I have performed more stairs tests with the flat rubber-foam lining but this time with different size drops produced from different sized needles. 4 hydrophones were used to capture the data so when I come to the position decoding (shouldn’t be long now!) I have something to play with. This also helps with the size estimation routines.
Phil
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