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Entry  Thu Dec 4 17:42:23 2008, caryn, Update, IOO, drum modes observable without excitation drum_modes.pdfdrum_modes2.pdf
    Reply  Fri Dec 5 09:29:59 2008, rana, Update, IOO, drum modes observable without excitation 
       Reply  Fri Dec 5 21:31:11 2008, Yoichi, Update, IOO, drum modes observable without excitation 
Message ID: 1176     Entry time: Thu Dec 4 17:42:23 2008     Reply to this: 1179
Author: caryn 
Type: Update 
Category: IOO 
Subject: drum modes observable without excitation 
So, the mode cleaner was evidently aligned better and now the drum modes are observable using DTT.
The Lock-In was set to 27.8kHz and the drum mode frequencies were previously observed to be 28.039kHz(MC2), 28.222kHz(MC3) and 28.221kHz(MC1). So, we might expect peaks at ~239Hz,421Hz,422Hz.
Peaks have been observed around the expected frequencies in channel IOO-MC-DRUM1.
Note that it is possible to resolve the separate MC1 and MC3 peaks which are so close together.
(sorry these are pdf's and not png's)
Attachment 1: drum_modes.pdf  15 kB  | Hide | Hide all
drum_modes.pdf
Attachment 2: drum_modes2.pdf  4 kB  | Hide | Hide all
drum_modes2.pdf
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