Zhang Song, Jiang Hao, Gu Honggang, Chen Xiuguo, Liu Shiyuan
Opt Lett. 2020 Apr 1;45(7):2074-2077. doi: 10.1364/OL.387626.
A novel, to the best of our knowledge, optical method using a high-speed polarimetry is proposed for real-time attitude tracking in an ultra-large measurement range. The attitude metrology utilizes the field-of-view effect in birefringent crystals, which is known as the birefringence deviates with the field-of-view angle of polarized light. The basic principle of the metrology is presented via theoretical derivation and has been verified in the static retardance measurement experiments. With a resolution test, a temporal resolution of 0.4 ms per attitude measurement and an angular resolution up to 0.0025°are achieved. With the help of a bubble level, the attitude angles of an object attached with a birefringent wave plate are obtained in the dynamic experiments, which have achieved an accuracy better than 0.02°. Additionally, the angular velocity and acceleration of the real-time measured roll angle can be extracted simultaneously. The experimental results demonstrate that the proposed metrology has great potential and advantages in the real-time attitude sensing.
据我们所知，提出了一种新颖的使用高速偏振测量法的光学方法，用于在超大测量范围内进行实时姿态跟踪。姿态测量利用双折射晶体中的视场效应，即双折射随偏振光的视场角而变化。通过理论推导介绍了该测量法的基本原理，并已在静态延迟测量实验中得到验证。通过分辨率测试，实现了每次姿态测量0.4毫秒的时间分辨率和高达0.0025°的角分辨率。在气泡水准仪的帮助下，在动态实验中获得了附着有双折射波片的物体的姿态角，其精度优于0.02°。此外，还可以同时提取实时测量的横滚角的角速度和加速度。实验结果表明，所提出的测量法在实时姿态传感方面具有巨大的潜力和优势。
