A low-cost high-precision measurement method of string motion

Jean-Loic Le Carrou (1) , Delphine Chadefaux (1) , Léonard Seydoux (1) , Benoît Fabre (1)

1 IJLRDA-LAM - Lutheries - Acoustique - Musique

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.

Domaines: Acoustique [physics.class-ph]

Jean-Loic Le Carrou, Delphine Chadefaux, Léonard Seydoux, Benoît Fabre. A low-cost high-precision measurement method of string motion. Journal of Sound and Vibration, 2014, 333 (17), pp.3881-3888. ⟨10.1016/j.jsv.2014.04.023⟩. ⟨hal-01461744⟩