基于光路折叠的室内基线场误差分析方法研究

Error Analysis Methodology for Indoor Baseline Field Based on Optical Path Folding

为了有效开展长距离光电测距类仪器的室内检定工作,在50 m高精度导轨上利用1组平面反射镜进行光路折叠,搭建了100 m室内基线场。对基线系统的测量误差进行了分析,考虑各项误差的调整精度,将误差分析结果应用到实际光路调整过程中,分析得到对基线长度影响更显著的误差量,并对其进行了控制和调整,提高测量光路的平行性调整精度,最后选择双频激光干涉仪作为长度基准开展验证实验。实验结果表明:通过光路折叠方法可以实现2倍光程倍增,基线系统的精度较高,可进行连续测量,有效地解决了室内基线建立过程中所存在的检测效率低、可重复性差等技术问题。

In order to effectively carry out indoor verification of long-distance photoelectric distance measuring instruments,an indoor virtual baseline field was built based on the principle of folding optical path with a group of plane mirrors. The measurement error of the baseline system was analyzed. Considering the adjustment accuracy of various errors,the analysis results were applied to the actual optical path adjustment process. Through the analysis,the errors which have more significant effect on the baseline length were obtained,and they were controlled and adjusted to improve the adjustment accuracy of the parallelism of the measuring optical path. Finally,a dual frequency laser interferometer was used to provide reference length value to carry out the verification experiment. The experimental results show that double optical path multiplication can be achieved by optical path folding method,and the baseline system has high accuracy and can be used for continuous measurement,effectively solving the technical problems of low detection efficiency and poor repeatability in the process of indoor baseline establishment.