Institute of Product Development, Gottfried Wilhelm Leibniz Universität Hannover, An der Universität 1, 30823 Garbsen, Germany.
Cluster of Excellence PhoenixD (Photonics, Optics, and Engineering-Innovation across Disciplines), Welfengarten 1A, 30167 Hannover, Germany.
Sensors (Basel). 2023 Jan 13;23(2):943. doi: 10.3390/s23020943.
In this paper, a novel optical measurement principle for deformation, especially torsion, is presented. A laser beam is guided via total internal reflection (TIR) in a prism rod. Every single reflection causes an increasing change in the beam path, which can be measured by its effect on the outcoupling position of the laser. With a diameter of the prism rod of 10 mm and a length of 120 mm, the system achieves torsion sensitivities between 350 µm/° and more than 7000 µm/°, depending on the actual torsion angle φ. A decency level of sensitivity is defined for comparison, which is exceeded by a factor of ~55 at φ=0. The presented principle of TIR prism rods can be adapted to measure different load cases. Using two laser beams, bending and torsion can be distinguished and combined load cases analyzed. The resulting system can be integrated into machine elements, such as screws, to perform condition monitoring on mechanically loaded components.
本文提出了一种新颖的用于变形，特别是扭转的光学测量原理。激光束通过全内反射（TIR）在棱镜棒中引导。每次反射都会引起光束路径的逐渐变化，这种变化可以通过激光的外耦合位置的影响来测量。对于直径为 10 毫米、长度为 120 毫米的棱镜棒，系统在实际扭转角度φ为 0 时的扭转灵敏度在 350 µm/°和 7000 µm/°之间变化。为了进行比较，定义了一个合理的灵敏度水平，该水平在φ=0 时被超过了约 55 倍。TIR 棱镜棒的原理可以适应测量不同的负载情况。使用两束激光，可以区分弯曲和扭转，并分析组合的负载情况。由此产生的系统可以集成到机器元件中，例如螺丝，以对机械加载部件进行状态监测。
