论文部分内容阅读
由于采用干涉仪的激光超声技术造价较高,对环境噪声极为敏感,很难在工业中得到广泛应用,为此开发了基于压电传感器的激光超声场检测仪(LUFT)。该系统采用激光激发、压电传感接收的方式,既保留了激光高分辨率的优势,又兼具了系统造价低、使用方便的特点。本文中,利用该检测仪对标准钢试样及不同厚度的铝试样进行了测量,获得其表面波和纵波波速,并根据固体力学理论得到铝的泊松比和杨氏模量。计算结果与文献参考值误差较小,说明该方法的可行性,也说明了该激光超声场检测仪的可靠性。
Because of the high cost of using laser interferometer ultrasonic technology, very sensitive to environmental noise, it is difficult to be widely used in industry, for which the development of a piezoelectric sensor-based laser ultrasonic field detector (LUFT). The system uses laser excitation, piezoelectric sensing receiver, which not only retains the advantages of high-resolution laser, but also combines the system cost is low, easy to use features. In this paper, the standard steel samples and aluminum specimens with different thickness were measured by this detector, and the surface wave and longitudinal wave velocity were obtained. The Poisson’s ratio and Young’s modulus of aluminum were obtained according to the theory of solid mechanics. The error between the calculation result and the reference value of the document is small, indicating the feasibility of the method and the reliability of the laser ultrasonic field detector.