Over night we recorded some interesting data that may focus our testing today.
We did 18 small steps to span the range of temperatures that Celani's cell was working in durring the ICCF-17 demo.
The recorded T_mica and T_well look like this.
Nothing particularly stands out here to me. These corresponded to power steps that look like this:
The first two steps are bigger. The next steps were increases in voltage, so as they increased, the power increased more, and shows bigger steps here.
The pressure was a little bit choppy, but it was also on the edge of the noise limit for the pressure sensor, I think. Still, the pressure was definitely dropping after the last step. This seems to be the same kind of drop we saw in the 24 hour run.
The impedance is what I found interesting, though. There was a definite range in which the impedance would decrease with time.
I wanted to zoom into that area. When it is scaled up, it show up very clearly.
After the 3rd through the 7th step, impedance declined. After the res of them, the impedance was flat or inclined after the power step.
When I plot it vs T_mica, I get this funny looking graph. The little curvy bits happen between 202 C and 220 C. With a peak at 208 or so.
That is a tenuous link, but it intrigues me.
I am most intrigued by the wire's impedance dropping over time. I think that there might be something there to learn. I am interested in seeing how low the impedance will go when I go back to 208C. The fact that this is right near the operating conditions of the demo I saw with my own eyes has something to do with this. The fact that the actual operating temperature of the wire may be significantly hotter than the relatively massive mica might mean that there is an actual sweet spot in that temperature range.
Let's watch together.