[YokozaWashimi]
Today we performed the shaker injection test on the POP table covering box.
Details will be reported later
K1:PEM-PORTABLE_BS_BOOTH_POP_BNC4_OUT_DQ
I roughly analyzed today's shaker injection data, assuming the linear coupling.
In some cases, the vibration was excited outside of the injected frequency band, making it difficult to understand the results.
I continue the analysis more carefully.
This is the spectrogram during this work
When we inject 50-60Hz vibration on the POP table cover, we found 100-120Hz excess both in ACC and DARM.
When we inject 100-200Hz vibration, the ACC signal was 10-100 times larger than the reference at 100-120Hz. However, there was no excess in the DARM at 100-120Hz.
So we can assume that the 100-120Hz excess in DARM was directly excited by the 50-60Hz vibration.
spectrograms and ASDs (avoiding glithces)
I estimated the noise projection from the vibration of the POP box to the DARM, by ignoring the harmonics in the vibration and assuming the following equation:
If these results are correct, these noise contributions are much smaller than the current sensitivity.
