If a used "vertical beam" is not perfectly vertical in a measurement, a cosine error will be introduced into it. To decrease and compensate for this cosine error, a measurement system is proposed to measure the deviation of the laser beam from the vertical direction. The structure of our measurement system is illustrated, and a model for solving for the deviation angle is established. As the distance of the beam spots on the charge-coupled device is the essential parameter for the measurement results, the acquisition process for this distance is explained. Moreover, the accuracy of the algorithm used in the acquisition process is also tested by experiments. Further, a self-correction module is designed and applied to reduce the error caused by the corner cube reflector in the system. The characteristics of the measurement system such as the resolution, stability, temperature drift, and direction accuracy are analyzed through experiments. The combined uncertainty of the measurement system is calculated to be 11 x 10(-6) rad. (C) 2016 Optical Society of America
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机译:如果测量中使用的“垂直光束”不是完全垂直,则会在其中引入余弦误差。为了减小和补偿该余弦误差,提出了一种测量系统以测量激光束与垂直方向的偏差。举例说明了我们的测量系统的结构,并建立了求解偏角的模型。由于电荷耦合器件上束斑的距离是测量结果的基本参数,因此说明该距离的采集过程。此外,还通过实验测试了在采集过程中使用的算法的准确性。此外,设计并应用了自校正模块,以减少由系统中的角cube棱镜反射器引起的误差。通过实验分析了测量系统的特性,例如分辨率,稳定性,温度漂移和方向精度。测量系统的综合不确定度经计算为11 x 10(-6)rad。 (C)2016美国眼镜学会
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