Dobosz Marek, Jankowski Michał, Mruk Jakub
The Metrology and Biomedical Engineering Institute, Warsaw University of Technology, 02-525 Warsaw, Poland.
Sensors (Basel). 2023 Nov 20;23(22):9276. doi: 10.3390/s23229276.
The majority of current methods for measuring the angular deflection of a laser beam enable measurement only in one selected plane. However, there are tasks in which measurements of laser beam deflections in 3D are required. In this paper, we present a way of enabling two-axial measurements of the deflection of a beam based on a single-axis sensor. The key idea is to direct a laser beam, alternately, into one of two arms of a measurement system. In the first arm, the beam is transmitted directly to the angular sensor, while in the second, the beam is directed to the sensor via a special optical element that rotates the plane of the beam deflection; in other words, this element changes the deflection in the horizontal plane into a deflection in the vertical plane, and vice versa. To alternate the path of the beam, a variable phase retarder and a polarising beamsplitter are used. The proposed technique was experimentally verified, and the results confirm its effectiveness.
当前大多数用于测量激光束角偏转的方法仅能在一个选定平面内进行测量。然而，在某些任务中，需要对激光束在三维空间中的偏转进行测量。在本文中，我们提出了一种基于单轴传感器实现光束双轴偏转测量的方法。关键思路是将激光束交替引导至测量系统的两个臂之一中。在第一个臂中，光束直接传输至角度传感器，而在第二个臂中，光束通过一个特殊的光学元件引导至传感器，该光学元件会旋转光束偏转平面；换句话说，这个元件将水平平面内的偏转转换为垂直平面内的偏转，反之亦然。为了交替光束路径，使用了可变相位延迟器和偏振分束器。所提出的技术经过了实验验证，结果证实了其有效性。
