飞秒激光频域干涉测距相位信号分析与处理
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摘要
针对飞秒激光测距频谱干涉条纹信号,分析了被测距离精度对于相位信息采集与处理要求,详细介绍了光谱分辨干涉测距的数据处理过程。根据测距信号干涉谱的数学关系,推导了被测距离求解公式。采用快速傅里叶变换和坐标旋转数字计算法进行光谱分辨干涉信号处理,经过时域信号的傅里叶变换、信号相位解包裹、加窗函数时域信号滤波等环节,分别对飞秒激光测距频谱干涉条纹信号中每个频率的相位值进行处理和变换。系统仿真中,离散频谱分析的幅值最大误差从36.3%降低到15.1%。经过比对实验,该法能实现飞秒激光测距信号有效处理。
In view of the femtosecond laser ranging spectrum interference fringe signals,requirements for phase information acquisition and processing to distance measurement precision were analyzed,data processing of interference spectral resolution distance measurement were introduced in details.According to the mathematical relationship of ranging signal interference spectrum,the measured distance formula was deduced.Fourier transform method was used to realize the spectral resolution of interference signal processing,after many links such as time-domain signal' s Fourier transform,signal' s phase solution package,add window function time-domain signal' s filtering,each frequency' s phase value of interference fringe signals was processed and transformed respectively.After system simulation,the biggest error of the amplitude of discrete spectrum analysis reduced from 36.3%to 15.1%.Through the comparison experiment,the method can realize femtosecond laser ranging signal processing effectively.
In view of the femtosecond laser ranging spectrum interference fringe signals,requirements for phase information acquisition and processing to distance measurement precision were analyzed,data processing of interference spectral resolution distance measurement were introduced in details.According to the mathematical relationship of ranging signal interference spectrum,the measured distance formula was deduced.Fourier transform method was used to realize the spectral resolution of interference signal processing,after many links such as time-domain signal' s Fourier transform,signal' s phase solution package,add window function time-domain signal' s filtering,each frequency' s phase value of interference fringe signals was processed and transformed respectively.After system simulation,the biggest error of the amplitude of discrete spectrum analysis reduced from 36.3%to 15.1%.Through the comparison experiment,the method can realize femtosecond laser ranging signal processing effectively.
引文
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[2]华卿.基于全路径大气折射率补偿的多波长测距原理与实验研究:[学位论文].北京:中国科学院大学.2013.
[3]华卿,周维虎,徐艳.飞秒激光频率梳绝对测距技术综述.计测技术,2011,31(1):1-5.
[4]许艳.基于飞秒激光频率梳的绝对距离测量技术研究:[学位论文].武汉:华中科技大学,2012.
[5]武腾飞,梁志国,严家骅,等.飞秒光学频率梳测距技术的研究进展.计测技术,2011,31(5):162-167.
[6]DONG W,MASATO A.Comparison of length measuremests provided by a femtosecond optical frequency comb.Opt.Exp.,2014,22(6):7040-7045.
[7]安慰宁,张福民,吴翰钟,等.一种基于飞秒光频梳频域干涉的绝对测距方法.仪器仪表学报,2014,35(11):2458-2465.
[8]王辉俊,刘永涛,尤文强,等.一种基于改进差值算法的手持激光测距仪.仪表技术与传感器,2013(1):97-99.
[9]LEE J,LEE K,LEE S,et al.High precision laser ranging by time of flight measurement of femtosecond pulses.MeasSciTechnol,2012,23(8):l-8.
[10]徐艳,周维虎,刘德明,等.基于飞秒激光器光学频率梳的绝对距离测量.光电工程,201l,38(8):79-81.