THE LENGTH OF FLEXIBLE COILED TUBES MEASURED BY USING A SOUND CARD AND FRF

Iulian LUPEA

Abstract


In the paper a procedure to assess, at low cost, the length of various coiled tubes by using standing waves is presented. The air in the tube is excited by using a speaker and random signal in the frequency band of interest. The pressure is measured at both tube ends by using a two input channels sound card, in order to evaluate the frequency response function (FRF). From the peaks of the frequency response function (magnitude), the frequency values of the standing waves generated in the tube are identified and the length of the tube is evaluated. The acquisition system and the calculations are managed by a Labview application. Corrections can be applied in order to obtain better results.

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References


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