激光测速在线材速度测定中的应用及优化  

Application and optimization of laser velocimetry in measuring the speed of wire rod

作　　者：徐雷[1] 吴海滨[1] 李梓霂 陈新兵[1] 宋伟[1] XU Lei;WU Haibin;LI Zimu;CHEN Xinbing;SONG Wei(College of Physics and Optoelectronic Engineering,Anhui University,Hefei 230601,China;Green Industry Innovation Research Institute,Anhui University,Hefei 230088,China)

机构地区：[1]安徽大学物理与光电工程学院,安徽合肥230601 [2]安徽大学绿色产业创新研究院,安徽合肥230088

出　　处：《量子电子学报》2025年第2期278-285,共8页Chinese Journal of Quantum Electronics

基　　金：国家重点研发计划(2021YFB3202400);安徽省教育厅重大项目(K120465001)。

摘　　要：本研究基于激光多普勒测速原理,采用快速傅里叶变换(FFT)+连续傅里叶变换(CFT)频率解算综合方法,提高了线材速度测量精度。该方法结合自相关检测、FFT频谱估计、CFT频谱细化和能量重心估计频谱校正,实现了有效降噪,并提升了信噪比和频谱分辨率,从而提高了线材速度测量的准确度。仿真和实验结果表明,经过一重自相关后,采集信号的信噪比得到提升,速度测量平均绝对误差低于0.01 m/s;与Welch频谱估计相比,本方法在不同速度条件下速度测量的绝对误差更小,准确度更高。生产现场测试表明,不同工段的速度测量均满足高速线材生产控制的要求,证实了该方法的实用性。Based on the principle of laser Doppler velocimetry,this study proposes a hybrid frequency resolution methodology combining fast Fourier transform(FFT)and continuous Fourier transform(CFT),achieving enhanced measurement accuracy for wire rod velocity.By combining autocorrelation detection,FFT spectrum estimation,CFT spectrum refinement,and energy center estimation spectrum correction,this method achieves effective noise reduction,high signal-to-noise ratio and spectral resolution,thereby improving the accuracy of wire rod speed measurement.The simulation and experimental results show that the signal-to-noise ratio of the collected signal is improved after single autocorrelation,and the average absolute error of speed measurement is less than 0.01 m/s.Compared with Welch spectrum estimation,this method has a smaller absolute error and higher accuracy in speed measurement under different speed conditions.The on-site production tests show that the speed measurements of different sections meet the requirements of high-speed wire rod production control,confirming the applicability of this method.

关 键 词：激光技术 激光多普勒测速 快速傅里叶变换 连续傅里叶变换 线材 频谱细化与校正 

分 类 号：TN249[电子电信—物理电子学]