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.
M. A. Hopcroft (2021). Ringdown (https://www.mathworks.com/matlabcentral/fileexchange/27938-ringdown), MATLAB Central File Exchange. Retrieved .
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