.. _example_datasets_plot_LIGO_spectrum:


Plot the power spectrum of LIGO
-------------------------------
This compares the power spectrum computed using the raw FFT, and using
Welch's method (i.e. overlapping window functions that reduce noise).
The top panel shows the raw signal, which is the measurements of the
change in baseline length.  The bottom panel shows the raw and smoothed
power spectrum, used by the LIGO team to characterize the noise
of the detector.  The particular data used here is the injected
`Big Dog <http://www.ligo.org/news/blind-injection.php>`_ event.



.. image:: ../images/datasets/plot_LIGO_spectrum_1.png
    :scale: 100
    :align: center


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.. literalinclude:: plot_LIGO_spectrum.txt

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**Python source code:**

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:download:`[download source: plot_LIGO_spectrum.py] <plot_LIGO_spectrum.py>`

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