| 李茜茜,赵金峰,潘永东*.基于激光超声场检测的材料常数测量方法[J].实验力学,2016,31(3):352~360 |
| 基于激光超声场检测的材料常数测量方法 |
| On the Measurement Method of Material Constants Based on Laser Ultrasonic Field Testing System |
| 投稿时间：2015-08-15 修订日期：2015-11-22 |
| DOI：10.7520/1001-4888-15-140 |
| 中文关键词: 激光超声 杨氏模量 泊松比 压电传感器 超声无损检测 |
| 英文关键词:laser ultrasonic Young's modulus Poisson's ratio piezoelectric transducer ultrasonic non-destructive testing |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| Because of high cost of laser ultrasonic technology using interferometer and very high sensitivity to environmental noise, so it is difficult to be widely used in industry. Therefore, Laser Ultrasonic Field Testing (LUFT) system was developed based on piezoelectric transducer. In this system, signal is excited by laser and received by piezoelectric transducer, thus both advantage of laser high resolution of the, as well as the low cost and convenience in application are kept back. In this paper, using this testing system，standard steel samples and aluminum samples with different thicknesses were measured; Rayleigh wave speed and longitudinal wave speed were obtained, respectively; based on above data, Poisson ratio and Young's modulus were calculated according to elasticity theory. Small error between measurement and theoretical value demonstrates the feasibility of this method and the reliability of LUFT system. |
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