40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log  Not logged in ELOG logo
 List  |  Find  |  Login  |  Help 
Entry  Wed Jan 14 19:27:09 2015, ericq, Update, LSC, UGF servo now linear again 
    Reply  Thu Jan 15 03:18:11 2015, diego, Update, LSC, UGF servo now linear again 
       Reply  Fri Jan 16 04:14:05 2015, diego, Update, LSC, UGF servo now linear again 
          Reply  Fri Jan 16 20:37:52 2015, diego, Update, LSC, UGF servo now linear again 
Message ID: 10916     Entry time: Fri Jan 16 20:37:52 2015     In reply to: 10911
Author: diego 
Type: Update 
Category: LSC 
Subject: UGF servo now linear again 

I found an error in the model of the UGF servos, I have now corrected it; for future reference, now the division between TEST2 and TEST1 is properly done with complex math: given

TEST1 = a + i b\hspace{.5cm},\hspace{.5cm}}TEST2 = c + id

we have that TEST3:

 

TEST3 = \frac{TEST2}{TEST1} = \left(\frac{ac+bd}{a^2+b^2}\right) + \left(\frac{ad-bc}{a^2+b^2} \right)i

 

TEST3 is the actual signal that is now phase rotated to select only the I signal while rejecting the Q one.

 

All the updates to the model, the screens and the script have been SVNed.

ELOG V3.1.3-