This week we conducted more testing of the system. We obtained a number of acrylic squares from Ziang to use as our skull analog. We also made a silicone brain analog to place underneath the acrylic to mimic the breakthrough condition. During testing of the circuit, we discovered that the significant powerline noise observed in earlier testing was due to some fault in the board power supply. Switching out the power supply for a different model eliminated the noise and the circuit now behaves as expected with the right filtering characteristics. We obtained very good looking data with the correct peak behavior. It was very easily to visually threshold when breakthrough was about to occur. With the circuit working, our focus will shift to developing the breakthroguh detection algorithm.
During the week we also worked on the content for our V&V report.