LIGO SURF 2020 Progress Update Summary
This progress update on LIGO SURF 2020 by Darin C. Mumma from the Departments of Physics and Philosophy at Grove City College includes frequency domain plots, early BILBY output, questions, and next steps. It explores organizing windows for frequency domain transform and different window types, as well as showcasing old and new plots, BILBY corner plots, and varying distance in the project.
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Progress Update (July 10, 2020) LIGO SURF 2020 Darin C. Mumma Departments of Physics and Philosophy, Grove City College Mentors: Alan Weinstein, Colm Talbot, Alvin K. Y. Li LIGO Laboratory, California Institute of Technology LIGO-G18xxxxx-v1 LIGO SURF 2020 1 Form F0900043-v1
Introduction I. Updated frequency domain plots II. Early BILBY output III. Questions IV. Next steps LIGO-G18xxxxx-v1 LIGO SURF 2020 2 Form F0900043-v1
Old Plot LIGO-G18xxxxx-v1 LIGO SURF 2020 3 Form F0900043-v1
Organizing Windows frequency_domain_transform(oscillatory, times, window_type=osc_window_type or mem_window_type) osc_window_type = ... or mem_window_type = ... LIGO-G18xxxxx-v1 LIGO SURF 2020 4 Form F0900043-v1
Organizing Windows Window Types provided by scipy.signal.windows.get_window [https://docs.scipy.org/doc/scipy/reference/generated/scipy.signal.windows.get_window.html#scipy.signal.windows.get_window] ------------------------------------------------------------------------------ 'boxcar': rectangular window = no window (essentially) 'triang': triangular window, nonzero endpoints 'blackman': 3rd order cosine sum, minimizes leakage, almost as good as Kaiser window at doing so 'hamming': single cosine with nonzero endpoints, minimizes first side lobe 'hann': hamming window but with zero endpoints 'bartlett': triangular window but with zero enpoints, used to taper with little fd modulation 'flattop': 5th order cosine sum, used to measure signal amplitude, makes main lobe flat 'parzen': not sure about this one 'bohman': or this one, either 'blackmanharris': generalized hamming = more cosines, hamming but better 'nuttall': similar to blackman-harris 'barthann': combo of bartlett and hann ('kaiser', beta): formed from Bessel functions, beta = 0(rectangle), 5(hamming), 6(hann), 8.6(blackman) ('gaussian', std_dev): use only in special cases ('general_gaussian', power, width): same here ('slepian', width): maximizes power in main lobe ('dpss', norm half-bandwidth): first term is slepian window ('chebwin', attenuation): uses Chebyshev polynomials, kinda complicated ('exponential', decay constant): seems like it will cut power too quickly ('tukey', taper fraction): tf = 0(rectangle), 1(hann) ------------------------------------------------------------------------------ LIGO-G18xxxxx-v1 LIGO SURF 2020 5 Form F0900043-v1
New Plot LIGO-G18xxxxx-v1 LIGO SURF 2020 6 Form F0900043-v1
BILBY Corner Plots LIGO-G18xxxxx-v1 LIGO SURF 2020 7 Form F0900043-v1
Varying Distance Distance LIGO-G18xxxxx-v1 LIGO SURF 2020 8 Form F0900043-v1
Fixed Output LIGO-G18xxxxx-v1 LIGO SURF 2020 9 Form F0900043-v1
Questions LIGO-G18xxxxx-v1 LIGO SURF 2020 10 Form F0900043-v1
Questions 1. Time Domain vs. Frequency Domain? 2. Criteria for Positive Result? 3. Process? LIGO-G18xxxxx-v1 LIGO SURF 2020 11 Form F0900043-v1
Next Steps LIGO-G18xxxxx-v1 LIGO SURF 2020 12 Form F0900043-v1
Next Steps Soon Incorporate NRSur7dq4 Improve efficiency of BILBY code Later BILBY parallel Moving the process onto the LIGO cluster LIGO-G18xxxxx-v1 LIGO SURF 2020 13 Form F0900043-v1
