Integrated Optical Deformation Measurement with TIR Prism Rods

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Wolf, A.: Integrated Optical Deformation Measurement with TIR Prism Rods. In: Sensors 23 (2023), Nr. 2, 943. DOI:

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Sum total of downloads: 33

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.
License of this version: CC BY 4.0 Unported
Document Type: Article
Publishing status: publishedVersion
Issue Date: 2023
Appears in Collections:Fakultät für Maschinenbau

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pos. country downloads
total perc.
1 image of flag of Germany Germany 17 51.52%
2 image of flag of Vietnam Vietnam 4 12.12%
3 image of flag of United States United States 4 12.12%
4 image of flag of China China 3 9.09%
5 image of flag of Taiwan Taiwan 1 3.03%
6 image of flag of Sweden Sweden 1 3.03%
7 image of flag of Hong Kong Hong Kong 1 3.03%
8 image of flag of Finland Finland 1 3.03%
9 image of flag of Denmark Denmark 1 3.03%

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