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Ringdown.m determines the resonator frequency and Q from a ringdown measurement.



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A "ringdown" experiment records the amplitude of a resonator as it decays under the influence of the damping in the system, without any external input. Ringdown.m analyzes a data set from a resonator ringdown measurement and determines the resonator frequency and Q using different methods. An FFT is used to estimate the resonance frequency, and an exponential fit to the signal envelope is used to determine the Q. Finally, a minimum-search fit to the data set is performed to provide a second estimate of both values.

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v2.1: Several important bugfixes and improvements.


included example data file

MATLAB Release
MATLAB 7.8 (R2009a)

Inspired by: crossing, envelope

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