School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an 710048, China.
Joint Research Center for Optomechatronics Engineering, School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China.
Rev Sci Instrum. 2023 Jan 1;94(1):015108. doi: 10.1063/5.0126806.
The classic autocollimation method manages to measure the two-degree-of-freedom (2-DOF) angles, namely pitch and yaw, but fails to measure the roll angle. This paper proposes an autocollimation method that enables the simultaneous measurement of 3-DOF angles in which a carefully designed cooperated reflector (CR) splits the collimated beam into two returning beams parallel to the optical axis. The 3-DOF angles of the CR can be obtained by detecting the displacement and rotation of the crosshair images received by two photodetectors. The measurement principle is dissected, and the experimental results reveal that the constructed system achieves an accuracy of better than ±1.54 arcsec in the range of ±1000 arcsec. In addition, it is demonstrated that the system can be applied to the 3-DOF angle measurement of long-distance targets.
经典的自准直方法能够测量两自由度（2-DOF）角度，即俯仰角和偏航角，但无法测量滚动角。本文提出了一种自准直方法，能够同时测量 3-DOF 角度，其中精心设计的合作反射镜（CR）将准直光束分成两束与光轴平行的返回光束。通过检测两个光电探测器接收到的十字丝图像的位移和旋转，可以获得 CR 的 3-DOF 角度。本文剖析了测量原理，实验结果表明，所构建的系统在±1000 弧秒范围内的精度优于±1.54 角秒。此外，还证明了该系统可应用于远距离目标的 3-DOF 角度测量。
