第23卷
第1期
2015年1月
文章编号1004-924X(2015)01-0040-08
光学精密工程
Optics and Precision Engineering
Vol. 23No, 1
Jan.2015
利用信号拼接提高调频连续波激光测距系统的分辨力
曲兴华*，职广涛，张福民，时光
（天津大学精密测试技术及仪器国家重点实验室，天津300072）
摘要：提出了一种对等频率间隔的采样信号进行拼接来提高调额连续波激光测距系统的测臣分辨力的方法。研究了调频连续波激光测距的原理，设计搭建了基于一种双干涉系统的光纤调频连续波激光测距系统。利用辅助干涉系统产生
拼接的方法可以突破激光器扫描范固的限制，减少光源非线性的影响，从而提高系统的测距分辨力。得到结果表明，在测量距离为8.7m时，该系统的测距分辨力可达70um，30组测量结果的重复性标准差为35μm。
键词：激光测距；调频连续波，采样；信号耕接：空间分辨力关
中图分类号：TN247;TH744.3
文献标识码：A
doi;10, 3788/OPE, 20152301. 0040
Improvementofresolutionoffrequencymodulatedcontinuouswave
laserrangingsystemby signal splicing QUXing-hua',ZHIGuang-tao,ZHANGFu-min,SHI Guang
(StateKey Laboratory of Precision Measurement Technology and Instruments,
TianjinUniversity,Tianjin300072,China)
Correspondingauthor,E-mailquringhua@tju.edu.cn
Abstract: A new method to improve the measuring resolution of a Frequency Modulated Continuous Wave (FMCW) laser ranging system was presented by splicing the sampling signals at an equal frequency interval. The principle of FMCW laser ranging was explored and a fiber FMCW laser ranging system based on dual-interferometric systems was built.In which, the auxiliary interferometric system was used to generate time clock pulses to sample the measured signals at equally spaced optical frequencies and then to splice the sampling signals. By using LabVIEW graphical programming software, a signal processing system was design to detect signal errors, sample and splice signals. The experiments on the ranging system proposed were performed. The results show that the proposed method for sampling and splicing measured signals at equally spaced optical frequencies breaks though the laser scanning limitation and reduces the effect of tuning nonlinearity of the laser source, so it improves the ranging resolution. In the experiments, it offers the range resolution of 70 μm at 8. 7 m and the standard deviation of 30 group results is 35 μm.
收稿日期：2014-06-25；修订日期：2014-08-19.
基金项目：国家自然科学基金资助项目（No.51327006，No.51105274)：高等学校博士学科点专项科研基金资助项目
(No,20120032130002)