نبذة مختصرة : Abstract A mechanism for visualizing the magnitude of force is proposed. The mechanism displays the magnitude of the force to be measured as a stripe pattern or character of the principle of Moiré fringe. The structure of the visualization mechanism is extremely simple. The mechanism does not require strain gauges, amplifiers, cables, or other electrical elements. Although errors owing to hysteresis and parallax caused by structural issues have occurred in visualization devices developed to date, these problems have been resolved using a fiber optic plate and diffuse reflection. A method for acquiring the magnitude of force by photographing the mechanism with a camera and performing image processing to obtain a numerical value is also proposed. The performance of the improved force visualization mechanism was verified experimentally. It was demonstrated that the mechanism successfully displayed the appropriate characters corresponding to the magnitude of applied force, allowing the information to be captured as images. Furthermore, the sensor showed no observable hysteresis, while effectively eliminating parallax errors, using a fiber optic plate (FOP) and diffuse reflection. Compared to the acrylic optic plate (ALEC) method, force errors were significantly reduced at different rotation angles, with the FOP maintaining a force error around 0 N, while the ALEC method reached a force error of 24 N at a $$30^\circ $$ 30 ∘ rotation angle.
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