With the same manner of klog31965 and klog31997, we excited the violin peaks and measured the ring down.
IX :
IM temperature 180 K
Excitation stop 2024/12/26 5:31:00(JST)
Peak frequency 174.047 -> 174.141
IY :
IM temperature 182 K
Excitation stop 2024/12/26 5:35:00(JST)
Peak frequency 176.504 -> 176.594
EY :
IM temperature 187 K
Excitation stop 2024/12/26 5:39:00(JST)
Peak frequency 187.337 -> 187.421
EX :
IM temperature 190 K
Excitation stop 2024/12/26 5:43:00(JST)
Peak frequency 184.562 -> 184.594
I analyzed the ringdown data to estimate the violin Q-values.
The estimated Q-values are as follows:
- IX: 1.2e4
- IY: 0.86e4
- EX: 1.8e4
- EY: 2.0e4
If the sapphire fibers are completely dominated by the thermo-elastic noise, the Q-values should be 2.8e4 at 200 K.
Therefore, current Q-values are probably determined by the Brownian loss.
