Title
Full-field vibration measurements of the violin using digital stroboscopic holographic interferometry and electromagnetic stimulation of the strings Full-field vibration measurements of the violin using digital stroboscopic holographic interferometry and electromagnetic stimulation of the strings
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
conferenceObject
Publication
Melville :Amer inst physics ,
Subject
Physics
Source (journal)
Measurements by Laser and Noncontact Techniques: Advances and Applications
AIP conference proceedings / American Institute of Physics. - New York
Source (book)
12th International AIVELA Conference on Vibration Measurements by Laser, and Noncontact Techniques - Advances and Applications, JUN 29-JUL 01, 2016, Ancona, ITALY
Volume/pages
1740(2016) , 8 p.
ISSN
0094-243X
0094-243X
Article Reference
040005
ISBN
978-0-7354-1397-9
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
We developed a setup in which the strings of the violin are driven electromagnetically, and the resulting vibration of the instrument is measured with digital stroboscopic holography. A 250mW single mode green laser beam is chopped using an acousto-optic modulator, generating illumination pulses of 2% of the vibration period. The phase of the illumination pulse is controlled by a programmable function generator so that digital holograms can be recorded on a number of subsequent time positions within the vibration phase. From these recordings, the out of plane motion as a function of time is reconstructed in full field. We show results of full-field vibration amplitude and vibration phase maps, and time resolved full-field deformations of the violin back plane. Time resolved measurements show in detail how the deformation of the violin plane changes as a function of time at different frequencies. We found very different behavior under acoustic stimulation of the instrument and when using electromagnetic stimulation of a string. The aim of the work it to gather data which can be used in power flow calculations to study how the energy of the strings is conducted to the body of the violin and eventually is radiated as sound.
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