Vers une mesure non destructive de la qualit\'e des bois de lutherie

TL;DR

This paper introduces a non-destructive ultrasonic method to assess the quality of lutherie wood by measuring its stiffness tensor and analyzing its symmetry properties, providing a reliable indicator of wood quality.

Contribution

It demonstrates that ultrasonic measurement of the stiffness tensor and its symmetry deviation effectively quantify wood quality in a non-destructive manner.

Findings

A scalar indicator accurately describes wood quality changes.

The distance to the tetragonal symmetry group quantifies measurement quality.

Ultrasonic stiffness tensor measurement correlates with moisture content.

Abstract

An ultrasonic measurement of the stiffness tensor of a spruce specimen is made for different moisture content. We show that a known scalar indicator describres correctly the quality of the wood and that the distance from the stiffness tensor to the tetragonal symmetry group describes the quality of the measurements. -- Une mesure ultrasonore du tenseur d'\'elasticit\'e d'un \'epic\'ea de lutherie dont on fait varier la teneur en eau est pr\'esent\'ee. Il est montr\'e qu'un indicateur scalaire connu d\'ecrit bien l'\'evolution de la qualit\'e du bois et que la distance du tenseur d'\'elasticit\'e au groupe de sym\'etrie t\'etragonal permet de quantifier la qualit\'e des mesures.