Abstract: Based on the principle of Fraunhofer single-slit diffraction，this study utilizes its optical
magnification effect-capable of converting micron or even nanometer-level slit width changes into millimeter-
level fringe displacements-to construct a multi-functional precision measurement device．
The device boasts the advantages of non-contact operation and high sensitivity．Meanwhile，it is easy to
operate and low in cost，making it suitable for experimental teaching and scientific research．By establishing a
quantitative relationship between the slit width variation and the diffraction fringe displacement，the study
realizes high-precision measurement of parameters such as micro-displacement，Young ＇ s modulus，and
magnetostrictive coefficient． Combined with a self-developed Python intelligent reading program，the device
effectively eliminates manual observation errors and achieves closed-loop control of the "excitation-acquisition-
analysis-output" process．At the same time，a 3D animation simulation system is built with Unity 3D and Matlab
2024a，which visually demonstrates the experimental process and assists in experimental design．Experimental
results show that the uncertainty of the platform in measuring micro-displacement is less than 0．000 5 mm．The
relative deviation between the measured Young＇s modulus of the copper sheet and the theoretical value is less
than 0．3%，and the measured magnetostrictive coefficient is highly consistent with the theoretical value．The
"non-contact-full automation-nano precision" measurement mode constructed in this study provides a reliable
method for measuring material mechanics parameters and promotes the development of low-cost automated
nano-measurement technology．
