基于激光超声场检测的材料常数测量方法

发布时间：2018-06-27 10:14

本文选题：激光超声 + 杨氏模量　；参考：《实验力学》2016年03期

【摘要】：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。
[Abstract]:Because of the high cost of laser ultrasonic technology using interferometer and its sensitivity to environmental noise, it is difficult to be widely used in industry. Therefore, a laser ultrasonic field detector (LUFT) based on piezoelectric sensor is developed. The system adopts laser excitation and piezoelectric sensor receiving, which not only retains the advantage of high resolution of laser, but also has the characteristics of low cost and convenient use. In this paper, the surface and longitudinal wave velocities of standard steel and aluminum samples with different thickness are measured by using this instrument, and the Poisson's ratio and Young's modulus of aluminum are obtained according to the theory of solid mechanics. The error between the calculated results and the reference values is small, which indicates the feasibility of the method and the reliability of the laser ultrasonic field detector.
【作者单位】：同济大学航空航天与力学学院;
【分类号】：TH878.2

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