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Frequency spectrum in Doppler effect

  1. Sep 5, 2015 #1
    1. The problem statement, all variables and given/known data
    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.

    2. Relevant 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: Sep 5, 2015
  2. jcsd
  3. Sep 5, 2015 #2

    haruspex

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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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