40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  COMSOL elog  Not logged in ELOG logo
Entry  Thu Feb 14 12:38:51 2019, Ching Pin, Mechanics, , comsol modelling Screenshot_from_2019-02-14_12-47-11.pngScreenshot_from_2019-02-14_15-07-40.pngScreenshot_from_2019-02-14_15-41-41.pnggraph.pdf
    Reply  Fri Feb 15 21:05:31 2019, Ching Pin, Mechanics, , comsol modelling Screenshot_from_2019-02-15_21-40-01.png
       Reply  Tue Feb 19 19:52:53 2019, Ching Pin, Mechanics, , comsol modelling Screenshot_from_2019-02-19_19-52-10.png
          Reply  Fri Mar 1 19:33:40 2019, Ching Pin, Mechanics, , comsol modelling Screenshot_from_2019-03-01_19-35-32.pngScreenshot_from_2019-03-01_19-36-02.pngScreenshot_from_2019-03-01_19-46-25.png
             Reply  Mon Mar 4 17:22:07 2019, Ching Pin, Mechanics, , comsol modelling Screenshot_from_2019-03-04_19-13-28.pngScreenshot_from_2019-03-04_19-14-41.pngScreenshot_from_2019-03-04_19-15-37.pngScreenshot_from_2019-03-04_19-15-56.png
                Reply  Wed Mar 6 09:51:18 2019, Ching Pin, Mechanics, , comsol modelling Screenshot_from_2019-03-06_09-31-24.png
                   Reply  Thu Mar 7 10:10:37 2019, Ching Pin, Mechanics, , comsol modelling Screenshot_from_2019-03-07_10-10-47.png
Message ID: 135     Entry time: Mon Mar 4 17:22:07 2019     In reply to: 134     Reply to this: 136
Author: Ching Pin 
Type: Mechanics 
Category:  
Subject: comsol modelling 

I've updated the material properties to vary with temperature, mainly in the range of 90-140 K. Using the parametric sweep function to vary the input power of the heater, we get the eigenfreqencies' dependence on temperature to show up. The fractional dependence of 1.3e-5 /K around 123 K matches with what Aaron calculated in this elog entry, which is always a good sign that nothing is going horribly wrong. I've also added the flats to the silicon disc, for better accuracy. See the screenshots below showing the frequency shift with temperature.

Attachment 1: Screenshot_from_2019-03-04_19-13-28.png  429 kB  Uploaded Mon Mar 4 19:16:45 2019  | Hide | Hide all
Screenshot_from_2019-03-04_19-13-28.png
Attachment 2: Screenshot_from_2019-03-04_19-14-41.png  430 kB  Uploaded Mon Mar 4 19:16:45 2019  | Hide | Hide all
Screenshot_from_2019-03-04_19-14-41.png
Attachment 3: Screenshot_from_2019-03-04_19-15-37.png  145 kB  Uploaded Mon Mar 4 19:16:45 2019  | Hide | Hide all
Screenshot_from_2019-03-04_19-15-37.png
Attachment 4: Screenshot_from_2019-03-04_19-15-56.png  145 kB  Uploaded Mon Mar 4 19:16:45 2019  | Hide | Hide all
Screenshot_from_2019-03-04_19-15-56.png
ELOG V3.1.3-