Acoustic Doppler effect experiment: integration of frequency sound generator, tracker and visual analyser

Abstract

This study was conducted to design an acoustic Doppler effect experimental setup by integrating the frequency sound generator application, tracker and visual analyser. The experimental setup was evaluated by determining the frequency of the sound source in four cases; (a) a stationary observer and a moving sound source, (b) a stationary sound source and a moving observer, (c) a sound source and an observer are moving in the same direction and (d) a sound source and an observer are moving in the opposite direction. The findings showed that the percentage errors for the calculated values of the sound source frequency were less than 0.40% compared to the reference values for all four cases. Hence, the proposed acoustic Doppler effect experimental setup can be used to improve the acoustic Doppler effect concept among students.

Analysing the acoustic Doppler effect using an Arduino sensor

“…(low pitch) when the siren moves away from the listener. Several studies reported well-designed approaches to support students' learning about the Doppler effect [3][4][5][6][7][8][9]. They integrated up-todate technologies or devices into experiments, for example, using a smartphone application as a sound generator, analysing data via the Tracker freeware, and applying a video analysis technique to a ripple tank [3][4][5][6].…”