Blend Switching User Guide

Document #:

LIGO-T1200126-v1

Document type:

T - Technical notes

Abstract:

We have implemented real-time switching between blend filters for ITMX. The switching relies on two identical filter banks for each DOF, the CURR and NEXT bank, each of which contains all the possible blend filters. We use a C code block in Simulink to turn on/off filter modules in the two banks and smoothly ramp from the output of one bank to another. A Perl script interfaces with MEDM and triggers the C code.

Files in Document:

• Initial version (blend_switching_guide.pdf, file is not accessible)

Topics:

• Seismic Isolation
• System Engineering
• Suspensions
• Basic R&D
• Modelling

Authors:

• Ruslan Kurdyumov
• Christopher Kucharczyk
• Brian Lantz

Keywords:

blend filter smooth switching ITMX

Referenced by:

• LIGO-T1400284-v2: Glitches in the Blend Switch - Origin and Fix
• LIGO-E1200686-v2: aLIGO HAM-ISI, "Common Documentation" (List of all DCC trees, wikis, and general documentation)
• LIGO-E1300815: SEI Controls Document Hub