I injected 111, 112, 113, 114, 115, 118 and 119Hz, and (maybe)only linear signal can be detected in DARM.
I injected the 116 and 117 Hz with various amplitude (Fig.1 and Fig.2)
The DARM noise became larger if larger amplitude injection performed.
Also, I injected signals between 116 and 118 Hz with same amplitude (Fig.3.)
116.5 Hz injection seems larger noise in DARM
Anyway, there are some moved peak around this frequency in micophone, if we can find the origin of this peak, we may get the hint to reduce the DARM noise around 100 -140 Hz.
(Fig.4. showed the 5 hour spectrogram this morning)
Refer to the 116Hz acoustic injection for O3GK
https://klog.icrr.u-tokyo.ac.jp/osl/?r=14611
Comparison is difficult because the injection power is small and the interferometer is still noisier now.
.png)
.png)
.png){kind=link}
.png){kind=link}