MateSY Shaft Torsion Tester STT-Shaft Torsion Tester Threadless & Profiler Torsion Testing is a system used to test twisted structures and roughness on shafts in a matter of seconds. To avoid radial shaft seal leakage, the sealing surface of the shaft needs to be free of twisting. Through optical diffraction, the distorted structure can be seen, the amplitude of which is much lower than the roughness amplitude of the sealing surface. As a result, quality control can be carried out close to the production process. With test times of a few seconds, these devices can be used in a variety of ways, e.g. for incoming goods inspection, process optimization of manufacturing processes or in series production The concept of optical diffraction of the mattesy axis torsion testing machine: in the process of light propagation, when encountering obstacles or small holes, the light will deviate from the path of straight line propagation and circulate behind the obstacle to propagate the phenomenon, which is called the diffraction of light, and the diffraction of light and the interference of light prove that light has waves, and the phenomenon that light waves will more or less deviate from the law of linear propagation in geometric optics after encountering obstacles. Geometric optics shows that light propagates in a homogeneous medium according to the law of lines, and light propagates at the interface of the two media according to the law of reflection and refraction. However, light is an electromagnetic wave, and when a beam of light passes through a porous barrier, it can spread to the geometric shadow area delineated by the law of linear propagation, which also causes certain dark spots or dark lines to appear in the geometric illumination area [2] . In conclusion, the diffraction effect makes the light distribution in the space behind the obstacle different from the light distribution given by geometric optics and the light distribution when the light waves propagate freely, and the diffracted light has a kind of redistribution.
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