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version (175 KB) by M. A. Hopcroft
Ringdown.m determines the resonator frequency and Q from a ringdown measurement.


Updated 19 Nov 2011

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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 Compatibility
Created with R2009a
Compatible with any release
Platform Compatibility
Windows macOS Linux

Inspired by: crossing, envelope

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