ABSTRACT In this study, a common-path compensation method is proposed for the laser beam drift resulting from the air parameters to enhance the stability of small-angle measurement in laser autocollimation. The measuring and reference beams generated with this method can propagate along approximately the same route such that the drifts in the two beams are nearly equal. Therefore, the angular drift of the measuring beam can be adequately compensated by that of the reference beam. The compensation principle was analyzed, and the experimental results revealed that, with three types of air parameter disturbances, the static measurement stability was better than 0.193 arcsec in 100 min after compensation, and the compensation rate was higher than 86.6%. Additionally, the dynamic measurement stability was 0.227 arcsec in 50 s after compensation, and the compensation rate was 53.6%. It is confirmed that the proposed method is effective for laser autocollimation.

中文翻译：

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基于共径补偿法的激光自准直小角度测量

摘要 本研究针对空气参数引起的激光束漂移提出了一种共路径补偿方法，以提高激光自准直中小角度测量的稳定性。用这种方法生成的测量光束和参考光束可以沿大致相同的路径传播，使得两个光束的漂移几乎相等。因此，参考光束的角漂移可以充分补偿测量光束的角漂移。分析了补偿原理，实验结果表明，在三种空气参数扰动下，补偿后100 min静态测量稳定性优于0.193 arcsec，补偿率高于86.6%。此外，补偿后的动态测量稳定性在 50 秒内为 0.227 弧秒，赔偿率为53.6%。证实了所提出的方法对于激光自准直是有效的。