This is continuing on from here but now focusing on the mechanical build rather than interleaving with the sim.
Spring based isolation
I’ve hung the whole apparatus now from a string that’s ~1m long:
Results
The full scale drift over a few seconds that the previous flexure based system exhibited now (after waiting a few minutes) is much more stable with this system. you can see the rough slope here where over a period of many seconds it only drifts over a small part of the full scale range:
Interestingly in this setup there is a distinct peak around 450Hz, I wonder what that is.
Another great shot with better alignment - look at that extinction ratio!
