Velocidade do som em um gás: um experimento utilizando Arduino

Abstract

This work aims to develop an experimental apparatus capable of analyzing the behavior of sound waves using a tube with Arduino, and use it to experimentally measure the velocity of sound in a gas at a constant temperature. In addition, we implemented a frequency ramping technique to find the resonance frequencies in the sound tube. For this, we developed an electronic system involving the Arduino with sensors to capture audio signals, a probe movement system to move a microphone along with a thermocouple, and a circulating thermal reservoir system surrounding the sound tube to keep the temperature inside it stable. With this apparatus it was possible to measure the velocity of sound with good agreement with theoretical results, as well as experimentally verify that the profile of maxima and minima of a sound wave in a tube depend directly on the boundary conditions of the system. Finally, the system developed here allows teachers and students to have access to new teaching and research tools in the study of sound waves.