分步式短脉冲激光时间分布特征快速识别模型构建  

Construction of fast-recognition model for time distribution characteristics of step by step short pulse laser

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作  者:张海庆[1] 韩军[1] 吕德华 ZHANG Haiqing;HAN Jun;LV Dehua(Xi'an technological university,Xi'an 710021,China)

机构地区:[1]西安工业大学,西安710021

出  处:《激光杂志》2021年第3期86-90,共5页Laser Journal

基  金:陕西省自然科学基金(No.41476554)。

摘  要:短脉冲激光中时间分布特征会对光束调节产生一定影响,降低其超分辨率,为提高激光测量系统识别精度,构建分步式短脉冲激光时间分布特征快速识别模型。针对脉冲在传输过程中出现畸变的现象,利用傅里叶变换做时频信号转换,得出脉冲传输规律;通过对激光工作物质储能的调节,确保光源质量,采用CCD测量方法获取空间载波条纹图像,从条纹周期中获得脉冲相位分布信息;结合相位分布情况,使用多元线性表达式描述脉冲时间序列;对该序列做Hilbert转化,建立脉冲信号模型,获取脉冲包络特性,重建相位空间,得到时间特征总点数比值,经过对时频熵的计算,识别出时间分布特征,完成完整识别模型的构建。仿真结果表明,设计方法能有效抑制谐波干扰,提高识别精度。In order to improve the recognition accuracy of the laser measurement system,we construct a step-by-step fast recognition model of short-pulse laser time distribution.We aim to find out the phenomenon of pulse distortion in the transmission process,as the Fourier transform is used to transform the time-frequency signal to obtain the pulse transmission rule.We ensured the quality of the light source by adjusting the laser working material's energy storage.We also obtained the space carrier fringe image using the CCD measurement method,and thus we received the pulse phase distribution information from the fringe period.We use the multiple linear expression with the combination of phase distribution after Hilbert transformation;hence,we are capable of establishing the pulse signal model.The ratio of total points of time characteristics is obtained through the pulse envelope characteristics as well as the reconstruction of the phase space.We identified the time distribution characteristics after calculating time-frequency,then we complete the construction of the both entropy and the recognition model.The simulation results show that the design method can effectively suppress harmonic interference and improve recognition accuracy.

关 键 词:分布式短脉冲 时间分布特性 快速识别模型 时频熵 傅里叶变换 

分 类 号:TN253[电子电信—物理电子学]

 

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