The Voltage vs Frequency conversion for VCO is here.
It's not linear over the range. I have to check what is the average value of the VCO during our measurement.
Then, if it's small enough, linear approximation can be used to convert the data from VCO to Hz/rt Hz.
I think It's better to use linear fit because the psd of the voltage does not contain information about the sign of the signal.
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- Even after the removal of the Al tip, the scattered light noise looks still exist.
- Particularly I still could see apparent fringe wrapping when I shook the table or touch the foam construction.
- I still could not reject the possibility of the backscattering towards the PMC.
- We had the fringe wrapping up to ~200Hz. This corresponds to the motion of the scattered body or the optical
path for the scattered light by ~100um. Is that possible?
- The VCO feedback and the beat note PLL feedback seemed to have the same information so far.
- The lollipops at the trans mission ports are terrible. They are mechanically incorrect.
- What is the correct conversion between the VCO feedback and the beat note PLL feedback??
Both are VCO feedback signals but the slope looks different. Need precise investigation.
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