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Measurement of the resonance curve (Acoustics)
#17
Shocked 
I have slightly modified the program after version 3 obtained by Julien in order to have "infinite" measurements (now version 4). So, I measured not only an isolated resonance of the Helmholtz resonator (100 ml Erlenmeyer flask) studied at the beginning, but also a PVC tube closed at one end which gives a series 1:3:5 harmonics corresponding to the standing waves. I obtained the expected peaks (see the screen capture) but their heights were growing ruffly proportional to the frequency. I wonder if this is not an artifact of the signal treatment in the phyphox program. In the attached figure I have divided the signal by frequency (upper panel is the acoustic response of the Helmholtz resonator and lower panel is the corrected response of the tube)... Evidently the 1/f correction can be introduced to the acquisition program, but it has to be first understood (the phyphox program was developed from the given examples).
         


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.phyphox   Resonance 4.phyphox (Size: 139.37 KB / Downloads: 283)
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RE: Measurement of the resonance curve (Acoustics) - by solid - 04-12-2020, 05:18 PM

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