Département de Recherche en Ingénierie des Véhicules pour l'Environnement, Institut Supérieur de l'Automobile et des Transports, Université de Bourgogne, 49 Rue Mademoiselle Bourgeois, 58027 Nevers Cedex, France.
J Acoust Soc Am. 2013 Apr;133(4):2136-45. doi: 10.1121/1.4792484.
The acoustic properties of porous materials containing dead-end (DE) pores have been proposed by Dupont et al. [J. Appl. Phys. 110, 094903 (2011)]. In the theoretical description, two physical parameters were defined (the dead-end porosity and the average length of the dead-end pores). With the knowledge of the open porosity (measured with non-acoustic methods), and the measurement of kinematic porosity (also called the Biot porosity in this article), it is possible to deduce the dead-end porosity. Two acoustic methods for measuring the Biot porosity for a wide range of porosities are proposed. These methods are based on acoustic transmission and on the low and high frequency behaviors of acoustic indicators. The low frequency method is valid for high porosities. It involves measurements in a transmission tube and the knowledge of the theoretical asymptotic behavior of the phase velocity at high frequencies. The high frequency method is based on ultrasonic measurements and on the high frequency asymptotic behavior of the transmission coefficient. It is well adapted for material with relatively low values of porosity. Good precision was found for both methods and materials containing dead end porosity were tested.
Dupont 等人提出了含有封闭（DE）孔隙的多孔材料的声学特性。[J. Appl. Phys. 110, 094903 (2011)]。在理论描述中，定义了两个物理参数（封闭孔隙率和封闭孔隙的平均长度）。通过了解开放孔隙率（用非声学方法测量）和运动孔隙率（本文中也称为 Biot 孔隙率）的测量，可以推导出封闭孔隙率。提出了两种用于测量宽孔隙率范围内的 Biot 孔隙率的声学方法。这些方法基于声传输和声学指标的低频和高频行为。低频方法适用于高孔隙率。它涉及在传输管中的测量以及对高频时相速度的理论渐近行为的了解。高频方法基于超声波测量和传输系数的高频渐近行为。它非常适用于具有相对较低孔隙率的材料。两种方法都具有良好的精度，并且测试了含有封闭端孔隙的材料。
