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Figure 2
Volume–time curve of the input oscillation signal as measured at the airway opening. The complex waveform seen here is the result of the seven independent frequencies being generated simultaneously. These oscillations were measured at the airway opening using a custom-made three-dimensional printed restriction-based flow meter. The volume–time curve can be seen to repeat every 0.5 s correlating to the lowest input frequency of 2 Hz. Comparison of the input signal with the measured volume–time curve was performed to ensure accurate measurements at the airway opening.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 23| Part 1| January 2016| Pages 324-330
doi:10.1107/S1600577515021700
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