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Easy DMT: Using the chInterface Class to Create/Upgrade DMT Monitors
Rauha Rahkola, Univ. of Oregon
LSC Meeting, August 19-22, 2002 LIGO Hanford Observatory Richland, WA

LIGO-G020349-00-Z Easy DMT


Introduction to the chInterface utility class
! ! ! ! ! !

The design of a typical DMT monitor The chInterface model Simple examples: RMSWatch and Multi-RMSWatch Real-life example: absGlitch Other benefits of chInterface Features Looking beyond S1

LIGO-G020349-00-Z Easy DMT

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Design of the typical DMT Monitor
1.

Read a configuration file
1. configure monitor parameters 2. add channels (w/ preferences for filters, thresholds, etc.) 3. create a list of channels w/ their filters, thresholds, etc.

2.

Run through the data
1. for each channel, either:
! gather some statistics, or ! check if the data exceeds a threshold

2. log the results (log file, trigger, etc.) 3. repeat 3.

Final report
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LIGO-G020349-00-Z Easy DMT


The chInterface Model

!

Add:
" " " " " channels with addChannel (multiple!) filters to channel with addFilter statistic type with addStatistic glitch-checking functionality with addGlitch a method to report results with addResult filters to the data (or filtered data!) glitch-checking to the (filtered) data statistics-calculating to the (filtered) data result-logging to the results of the above

!

Apply one or all:
" " " "

LIGO-G020349-00-Z Easy DMT

LSC Meeting, August 19-22, 2002 Hanford

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A More Complex Example: A Simple Example: RMS-watch Multi-RMS
Read Config File Entry Process Data applyStats Compare statistics applyResult Finished?
Yes No

Done?
No Yes

Yes

Defaults to RMS of data

addChannel addFilter

New channel?
No

Yes

New filter?

End Monitor
LIGO-G020349-00-Z Easy DMT

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void absGlitch::ProcessData(void) { fCurrentTime = getDacc().getCurrentTime(); if ( Debug() > 1 ) cout <<"Processing Data: "<
Real-Life Example: absGlitch

//======================= If data is continuous, update stats & check event if ( fChannels.begin()->isTSContinuous() ) { // check continuity
for (CHiter ch = fChannels.begin(); ch != fChannels.end(); ch++) {

//----------- If the OSC, if used, is satisfied... if ( ch->getOSC().empty() || mOSC.satisfied(ch->getOSC().c_str()) ) {
//--------- convert TSeries to double (note: should take 0 time, but //--------- we'll be safe (if slow) by doing it here. Note that

//--------- the reason we need this is IIRFilter only uses doubles (*ch->getData())->Convert(DVector::t_double); //--------- filter data ch->applyFilters();
for (unsigned int i=0; i < ch->FBank.size(); i++) { list::iterator j;

//--------- update the filtered data statistics for (j=statList.begin(); j != statList.end(); j++) ch->applyStats( *j, ch->FBank[i] ); //--------- check for event for (j=glitchList.begin(); j != glitchList.end(); j++) ch->applyGlitch( *j, ch->FBank[i] );
} } // if ( ch->getOSC().empty() || mOSC.satisfied... } // for (CHiter ch = fChannels.begin(); ... //======================= Otherwise there's a continuity error } // if (fChannels.begin()->IsTSContinuous()) else fLogFile<<"TimeSeries Continuity Error " <<(*fChannels.front().getData())->getStartTime().getS()<= fEndRuntime) finish(); }

} LIGO-G020349-00-Z Easy DMT

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Other Benefits of chInterface Features
!

Modular forms of nnnConstruct classes
" modify a monitor to use a different glitch-finding scheme " statistical tests become plug-ins

!

Multiple functions through a single monitor
" a step closer to on-the-fly monitor configuration " new tests for coincidences/clustering different kinds of "glitches" w/ Event Tool

!

Heirarchy of filters
" create a band-pass filter using high- and low-pass filters " check results in intermediate stages of filtering

LIGO-G020349-00-Z Easy DMT

LSC Meeting, August 19-22, 2002 Hanford

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Looking Beyond S1

!

During S1:
" implement the GlitchConstruct equivalent of the absGlitch glitchfinding scheme " include the chInterface class in the GDS CVS tree

!

Between S1 and S2:
" absGlitch and eqMon monitors will implement chInterface after S1 " with the help of others, the repertoire of GlitchConstruct, StatisticsConstruct, and ResultConstruct classes will grow

!

After S2:
" much functionality of the existing (non-GUI) monitors will be replicated in the nnnConstruct classes

LIGO-G020349-00-Z Easy DMT

LSC Meeting, August 19-22, 2002 Hanford

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In Summary

! !

!

chInterface shoulders the burden common to most (all?) DMT monitors chInterface GlitchConstruct, StatisticsConstruct, and ResultConstruct are base classes from which can be derived the functional equivalents to existing monitors DMT monitors using chInterface can be multifunctional

More info: check http://www.ligo-wa.caltech.edu/~rrahkola/chInterface/ (until ~S2 begins, when chInterface is implemented in GDS)
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LIGO-G020349-00-Z Easy DMT