Miao Fengjin, Wu Bin, Peng Congcong, Ma Gaoju, Xue Ting
Appl Opt. 2019 Nov 20;58(33):9020-9026. doi: 10.1364/AO.58.009020.
The non-orthogonal shaft laser theodolite (N-theodolite) measurement system is a new kind of instrument applied to large-scale metrology. The system consists of two identical N-theodolites, each of which is made up of a two-dimensional rotary table and one collimated laser. The three axes of the N-theodolite have no strict requirements on their orthogonality and intersection conditions. A novel method, to the best of our knowledge, is proposed to calibrate the N-theodolite measurement system, and the calibration method of the laser beam for N-theodolite is the key innovation aspect of this paper. The laser beam is calibrated through dynamic rotation. Throughout the experiment, the straightness accuracy of the laser beam of the left N-theodolite is 0.08 mm and the right N-theodolite is 0.074 mm. The repeatability of the straightness accuracy is ${\pm 0.032},,{\rm mm}$±0.032mm. The uncertainty of straightness accuracy is 0.040 mm. The measurement experiment results show that the maximum deviation of the measured value of this system is 0.34 mm at a range of 5 m, which is verified to be a feasible method for the calibration of the laser beam.
非正交轴激光经纬仪（N型经纬仪）测量系统是一种应用于大规模计量的新型仪器。该系统由两个相同的N型经纬仪组成，每个经纬仪由一个二维转台和一台准直激光器构成。N型经纬仪的三个轴对其正交性和相交条件没有严格要求。据我们所知，本文提出了一种校准N型经纬仪测量系统的新方法，而N型经纬仪激光束的校准方法是本文的关键创新点。通过动态旋转对激光束进行校准。在整个实验过程中，左N型经纬仪激光束的直线度精度为0.08毫米，右N型经纬仪为0.074毫米。直线度精度的重复性为±0.032毫米。直线度精度的不确定度为0.040毫米。测量实验结果表明，该系统在5米范围内测量值的最大偏差为0.34毫米，这被验证是一种校准激光束的可行方法。
