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Entry  Tue Aug 5 19:20:05 2014, Akhil, Update, General, PID loop Design for beat note stabilization 
    Reply  Fri Aug 8 14:42:41 2014, Akhil, Update, General, PID loop Design for beat note stabilization PID.zip
Message ID: 10353     Entry time: Fri Aug 8 14:42:41 2014     In reply to: 10334
Author: Akhil 
Type: Update 
Category: General 
Subject: PID loop Design for beat note stabilization 

 The attached in a zip file are the Simulink feedback loop models for the FOL for both X and Y ends. The controller PID values are estimated by setting a temperature count reference point to 5344, which corresponds to 100 MHz frequency.  The plant transfer function is as calculated in my previous elogs.

 We were not  able to test the PID loop , with the green laser by PZT actuation because of the misalignment of the arms and non-existence of the beat note since last few days. However, we have a complete idea of the design and PID parameters that will be used for the FOL with infrared laser. So we decided that it would be better to test the loop by temperature actuation after the fiber optics is installed and the coupling of infrared laser into the fiber is complete. As of now, we have planned to place the FOL box inside so that it can be used to obtain the green laser beat note on the StripTool graphs. 

Attachment 1: PID.zip  19 kB  Uploaded Sat Aug 16 03:39:17 2014
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