Attached are two raw noise measurements Matsusada PZDE-0.3B High Voltage driver.
- Plot 1 with the PZT attached after a 10kOhm resister, producing a 375Hz pole.
- Plot 2 without the PZT attached.
Note that MokuLab reports dBm, even though the input is on 1MOhm (and I could not find out how to change it). While this makes no sense to me, I assume Mokulab assumes 50Ohm...
With that, the typical noise level around 100Hz is -80 to -90 dBm (lots of lines).
That would correspond to
- -80dB --> 10^(-80/20)*sqrt(50*0.001) Vrms = 22uVrms
- -90dB --> 10^(-90/20)*sqrt(50*0.001) Vrms = 7uVrms
If I use the nominal 2*3.7um/1000V PZT actuation coefficient (2* since the optical path length is twice the mirror displacement), I get
- -80dB --> 1.7e-13 meter rms
- -90dB --> 5.2e-14 meter rms
for the induced PMC length noise
