LineMonitor
The LineMonitor is used for real-time monitoring of narrow resonances in
LIGO data. Below, the output and usage of the LineMonitor are described.
Output data
The LineMonitor has several types of output data;
- HTML Output
The html summary is composed of the following sections;
General information
(start time, elapsed time, channel name, present time)
Summary of monitored lines
(average amplitude, average frequency, SNR, etc.) The parameters of monitored lines
are served to the DMTVIEWER and they are saved in the trend and LineMonitor
data files.
Summary of observed lines
The LineMonitor looks through the data for lines strong enough to exceed the signal to noise ratio
specified with the -R option.
Summary of detected lines
The LineMonitor looks through the data for lines strong enough to exceed a signal to noise ratio
of 15.
-
Alarms
The SNRs to trigger alarms can be set for each line tracked. Alarm
results can be accessed through
Monitors
. Alarms will also highlight the corresponding line in the "Monitored
Lines" section of the html output page red.
- Trend data served to theDMTVIEWER
The fundamental frequencies, signal to noise ratios, amplitudes
and phases of all harmonics can be viewed with the DMTVIEWER as a function
of time.
- Trend frame files
These frame files contain minute trend data posted to the DMTVIEWER.
- LineFilter data files
The LineMonitor saves the line parameters in files, one
line (including harmonics) per file. These data files have more detailed information
about the lines, like the coefficients of the optimal filter, raw data for
frequencies and phase, etc. The line monitor data files can be processed
in ROOT.
Usage
The LineMonitor executable is distributed with the DMT
library. If the DMT is installed, the LineMonitor can be executed. When no
input parameters are specified, the LineMonitor will print out a help message.
Otherwise, the usage is;
LineMonitor [-c <channel>] [other parameters]
Further information on parameters and usage is present here.