M Ashley - LSC Meeting – LIGO Hanford, 12 Nov 2003

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Presentation transcript:

M Ashley - LSC Meeting – LIGO Hanford, 12 Nov 2003 LineAmp -a heterodyne technique to determine calibration line strength and phase. Mike Ashley Center for Gravitational Wave Physics The Pennsylvania State University M Ashley - LSC Meeting – LIGO Hanford, 12 Nov 2003

M Ashley - LSC Meeting – LIGO Hanford, 12 Nov 2003 Heterodyne methods unfiltered AS_Q channel mixed with local (software) oscillator with the line frequency Shifts the line frequency to zero real and imaginary parts form two quadratures deduce the amplitude and phase. two quadratures are normally distributed result integrated over a given time period (60s) M Ashley - LSC Meeting – LIGO Hanford, 12 Nov 2003

M Ashley - LSC Meeting – LIGO Hanford, 12 Nov 2003 LineAmp packages coded in MATLAB produces trend files in .mat format. MATLAB scripts produce eps figures of amplitude and phase scripts automate daily summary figure production S2 summary and data files https://gravity.psu.edu/~s2/detchar/lineamp M Ashley - LSC Meeting – LIGO Hanford, 12 Nov 2003

M Ashley - LSC Meeting – LIGO Hanford, 12 Nov 2003 S2 data M Ashley - LSC Meeting – LIGO Hanford, 12 Nov 2003

M Ashley - LSC Meeting – LIGO Hanford, 12 Nov 2003 S2 data M Ashley - LSC Meeting – LIGO Hanford, 12 Nov 2003

M Ashley - LSC Meeting – LIGO Hanford, 12 Nov 2003 First look at S3 M Ashley - LSC Meeting – LIGO Hanford, 12 Nov 2003

M Ashley - LSC Meeting – LIGO Hanford, 12 Nov 2003 First look at S3 M Ashley - LSC Meeting – LIGO Hanford, 12 Nov 2003

M Ashley - LSC Meeting – LIGO Hanford, 12 Nov 2003 Compiled versions produced using the MATLAB compiler yields an executable which only requires: the MATLAB runtime libraries installed (free and MATLAB not required!) access to frames by LDAS (for FrameCacheQuery) or LDR and PSU’s FrameIO::Channel routines analyses 1 day in approximately 1 hour. Comparison: interactive use requires just under 2 hours per job. M Ashley - LSC Meeting – LIGO Hanford, 12 Nov 2003

Status and Future Directions Transfer function stability of the IFO compares AS_Q and an excitation channel calculates the relative amplitude and phase presently validating results Investigation of detector stationarity Rician distributed amplitude (phase obeys related function) use amplitude (m, s) to determine if transfer function consistent divide data into stationary segments Is there some ‘natural’ period of time to produce lineamp averages? M Ashley - LSC Meeting – LIGO Hanford, 12 Nov 2003

Status and Future Directions produce a fast tool for producing alpha and beta coefficients for offline verification. Minute trend (almost real time) for analysing data online. Online plots for H1,H2 being generated. L1 coming soon. LineAmp Webpage - http://gravity.psu.edu/~ashley/LSC/LineAmp M Ashley - LSC Meeting – LIGO Hanford, 12 Nov 2003