Share Email Print

Optical Engineering

Grading of wooden plates for musical instrument making by means of holographic interferometry
Author(s): Stanislav Urgela
Format Member Price Non-Member Price
PDF $20.00 $25.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

Wood selection for musical instrument making is usually based on visual estimation and on manual mechanical and vibrational subjective testing. The method proposed uses TV holography and holographic interferometry with a double-pulsed laser to visualize the standing acoustic waves and the impact generated by transient waves as inspection testing tools. The theory of bending waves in orthotropic plates is used to interpret the experimental results. This enables us to estimate Young’s moduli parallel to and perpendicular to the grain and the in-plane shear modulus in wood. The testing is nondestructive, so the expensive wooden plates can be used in production. Properly modified, the test can be applied to the judgment of any wooden and wooden composite plates. The 3-D charts for a set of the physicoacoustical characteristics—density, modulus of elasticity, and acoustic constant on the axes—are confirmed as a useful procedure that can help to provide more objective results in wood grading for materials selection in the design of musical instruments, mainly bowed string instruments and pianos.

Paper Details

Date Published: 1 July 1998
PDF: 11 pages
Opt. Eng. 37(7) doi: 10.1117/1.601702
Published in: Optical Engineering Volume 37, Issue 7
Show Author Affiliations
Stanislav Urgela, Technical Univ. Zvolen (Slovak Republic)

© SPIE. Terms of Use
Back to Top