THE LENGTH OF FLEXIBLE COILED TUBES BY OBSERVING THE SOUND PROPAGATION TIME
A procedure to assess the length of coiled tubes by using the time of sound propagation along the tube, is presented. At one end of the tube a sine wave is generate using a speaker. The sine wave is recorded at both tube ends by using two microphones connected to the input channels of the acquisition system, in order to evaluate the time delay between the two waves. The acquisition system and the calculation of the tube length are managed by a Labview application. The sound speed in the tube is observed in function of the frequency and the tube diameter.
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