40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
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Entry  Thu Oct 24 04:13:15 2013, Jenne, Update, LSC, PRMI + 2 ALS arms 
    Reply  Thu Oct 24 08:04:54 2013, Steve, Update, LSC, PRMI + 2 ALS arms 
    Reply  Thu Oct 24 09:08:27 2013, jamie., Update, LSC, PRMI + 2 ALS arms 
    Reply  Thu Oct 24 14:14:18 2013, rana, Update, LSC, PRMI + 2 ALS arms 
       Reply  Thu Oct 24 15:19:58 2013, Koji, Update, LSC, PRMI + 2 ALS arms 
    Reply  Thu Oct 24 23:25:37 2013, Jenne, Update, LSC, End transmission triggering 
       Reply  Tue Nov 5 16:47:09 2013, Jenne, Update, LSC, End transmission QPDs 
    Reply  Fri Oct 25 04:03:40 2013, Masayuki, Update, LSC, 'scope and spectrum analyser for REFL165 
       Reply  Fri Oct 25 21:36:51 2013, Masayuki, Update, LSC, 'scope and spectrum analyser for REFL165 
          Reply  Mon Oct 28 14:24:01 2013, Masayuki, Update, LSC, 'scope and spectrum analyser for REFL165 
             Reply  Mon Oct 28 18:57:27 2013, Masayuki, HowTo, LSC, read 'scope and spectrum analyser datas 
Message ID: 9286     Entry time: Thu Oct 24 23:25:37 2013     In reply to: 9274     Reply to this: 9345
Author: Jenne 
Type: Update 
Category: LSC 
Subject: End transmission triggering 

Quote:

Software (schmidt triggering) for end transmission QPDs.

 I have modified the ETM suspension models to include a schmidt triggering block, so that we can choose between using the high gain low power Thorlabs PD and the low gain high power QPD. 

The Thorlabs high gain PD signal is used as the signal to trigger on, so we need to put appropriate thresholds in.

If things are "triggered", that will imply that the Thorlabs PD is seeing a lot of power, so we should be using the QPD SUM channel instead.  There is a "choice" block after the trigger block, to do this switching.

Since the LSC model will only see the output of this choice block, the gain that is currently in C1:LSC-TR[X or Y]_GAIN should be moved to the end SUS model.  We also need to find the correct gain for the QPD sum channels so that they are also normalized to "1" for single arm full power so that we can smoothly go between the 2 diodes.

Rana has promised to make screens, and write scripts for the switching stuff.

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