An acoustic method for a quantitative assessment of the volume content of a polymeric matrix in CFRPs is proposed and realized experimentally. For this purpose, a laser-ultrasonic method based on the thermo-optical excitation of broadband pulses of longitudinal acoustic waves is used. A formula for calculating the volume content of the polymeric matrix in a CFRP from experimentally measured phase velocities of longitudinal acoustic waves in this material is proposed. Distributions of the volume content of the matrix in a control CFRP specimen and in a CFRP structure made under similar conditions are obtained. It is shown that the laser-ultrasonic method allows one to detect the areas with excess and deficient matrix content in CFRP specimens and areas of CFRP constructions and to quantitatively assess the spread of matrix content. The spread between the maximum and minimum matrix content observed depends on the shape of the investigated area of the structure. This method can be used for the quality control of composite structures before their exploitation.

中文翻译：

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使用激光-超声波方法测定 CFRP 结构中聚合物基质的体积含量

提出并通过实验实现了一种定量评估 CFRP 中聚合物基质体积含量的声学方法。为此，使用基于纵向声波宽带脉冲的热光激发的激光超声方法。提出了一种计算 CFRP 中聚合物基体体积含量的公式，该公式根据实验测量的该材料中纵向声波的相速度。获得了控制 CFRP 试样和在类似条件下制成的 CFRP 结构中基体体积含量的分布。结果表明，激光超声方法可以检测 CFRP 试样中基体含量过多和不足的区域和 CFRP 结构区域，并定量评估基体含量的分布。观察到的最大和最小基体含量之间的分布取决于结构研究区域的形状。该方法可用于复合结构开发前的质量控制。