CFRP厚度激光超声脉冲反射测试及工艺优化
Thickness Measurement and Process Optimization of CFRP Based on Laser Ultrasonic Pulse Reflection Method
贾红宾 1张明2
作者信息
- 1. 新乡职业技术学院信息工程学院,河南 新乡 453000
- 2. 河南理工大学机械工程学院,河南 郑州 450000
- 折叠
摘要
为了提高碳纤维复合材料CFRP的厚度测试精度,设计了一种基于激光超声脉冲反射法的CFRP厚度测试方法,并进行工艺参数优化.研究结果表明:以凸透镜进行厚度测试时,可以达到5.2%以内的相对误差.提高光斑外径后,形成了更低幅值的超声波信号.凸透镜聚焦形成的光斑面积比柱面透镜聚集形成的光斑面积更小,提高了能量密度,促进了更大幅值超声信号被激发,显著增强激光热弹效果.不存在外部光源的情况下,形成了具有稳定频率的反射信号.当光源功率提高后,信号中产生了更大噪声频率与幅值;背景噪声对多次反射回波也造成了淹没.功率0.45mW与0.60mW时,信号相对有效信号频率更大,对反射信号也造成明显影响.该研究可以拓宽到其它微观材料的厚度检测领域,具有很好的精度控制标准.
Abstract
In order to improve the thickness measurement accuracy of carbon fiber composite(CFRP),a thickness measurement method of CFRP based on laser ultrasonic pulse reflection method was designed,and the process parameters were optimized.The results show that the relative error can be less than 5.2%when measuring the thickness with convex lens.When the outer diameter of spot is increased,the ultrasonic signal with lower amplitude is formed.The spot area formed by convex lens focusing is smaller than that formed by cylindrical lens gathering,which improves the energy density,promotes the excitation of ultrasonic signal with larger value,and significantly enhances the laser thermoelastic effect.In the absence of external light sources,a reflected signal with a stable frequency is formed.When the power of the light source is increased,more noise frequency and amplitude are generated in the signal.Background noise also causes multiple reflection echo to drown.When the power is 0.45MW and0.60MW,the relative effective signal frequency is larger,and the reflected signal is also significantly affected.This research can be extend-ed to the thickness measurement of other microscopic materials and has a good precision control standard.
关键词
碳纤维复合材料/激光/超声脉冲/测厚/透镜/光斑直径Key words
Carbon Fiber Composites/Laser/Ultrasonic Pulse/Thickness/Lens/Spot Diameter引用本文复制引用
基金项目
河南省高等学校重点科研项目(20B510011)
出版年
2024
NETL
NSTL
万方数据