Frequency spectrum in Doppler effect

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SUMMARY

The discussion focuses on the application of the Doppler effect in circular motion, specifically analyzing sound pressure over time using Vernier's Logger Pro software. The user experimented with two frequencies, 3000Hz and 1000Hz, while maintaining a circular radius of 40cm. The inquiry centers on the utility of FFT (Fast Fourier Transform) analysis in interpreting the frequency spectrum obtained from the sound data. The consensus indicates that for a pure tone source, FFT may not provide significant insights beyond the single frequency observed.

PREREQUISITES
  • Understanding of the Doppler effect in sound waves
  • Familiarity with Vernier Logger Pro software
  • Basic knowledge of Fast Fourier Transform (FFT) analysis
  • Concept of sound pressure levels
NEXT STEPS
  • Explore advanced applications of FFT in sound analysis
  • Research the mathematical principles behind the Doppler effect
  • Learn about sound pressure measurement techniques
  • Investigate the implications of frequency modulation in sound waves
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Students and researchers in physics, audio engineers, and anyone interested in sound wave analysis and the Doppler effect in various contexts.

yulija
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Homework Statement


I have been investigating the Doppler effect in a circular motion with a stationary source and moving observer (however the main aim is to determine the speed of sound in the end). Using Vernier software - Logger Pro - I have obtained two graphs of the sound pressure against time.

I may also use FFT analysis and get a frequency spectrum but I am not sure what I can use it for. How can in help?

I tried two different frequencies:
f1 = 3000Hz
f2 = 1000Hz

And the radius of the circle was 40cm.

Homework Equations


observer-moving-stationary-source.png
observer moving towards the source
observer-away-from-stationary-source.png
observer moving away from the source
 
Last edited:
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If your source is more-or-less a pure tone, I don't see how FFT will help. It will still be a single frequency received at any instant.
Was that your only question?
 

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