Elsevier, Journal of Sound and Vibration, 17(333), p. 3881-3888, 2014
DOI: 10.1016/j.jsv.2014.04.023
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The high-precision measurement of a string׳s motion requires either the use of an expensive apparatus or the development of a dedicated system. In this paper, a cheaper alternative based on opto-switch sensors combined with a suitable calibration is proposed. A sensitivity model requiring only two straightforward preliminary measurements to determine the parameters is presented. A comparison on a bench test between the opto-switch sensor and a high-speed camera has been performed. Results indicate that the calibrated opto-switch provides more accurate measurements of the string׳s motion in quasi-static as well as in dynamic states.