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| Ｒesearch on Grating Spectral Simulation Based on MATLAB |
| SUN Yi1，YIN Hang2，LI Chuhan2，LI Qinzhe3，HE Xuemin 2*
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1．College of Artificial Intelligence，Nanjing Univeosity of Post and Telewmmunications，Nanjing 210023，China;2．College of
Science，Nanjing University of Posts and Telecommunications，Nanjing 210023，China;3．College of Chemistry and Life Sciences，Nanjing University of Posts and Telecommunications，Nanjing 210023，China
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Abstract A grating diffraction spectrum simulation program was designed based on MATLAB．By constructing the mathematical models of the grating equation，the order defect condition and the light intensity distribution，the dynamic simulation of grating diffraction with adjustable multiple parameters(such as wavelength，grating constant，and number of slits)was achieved．The program supports the input of polychromatic light(multiple wavelengths)，calculates the light intensity distribution by combining single-slit diffraction and multi-slit interference factors，and generates the spectral intensity distribution curve and diffraction fringe distribution map．The simulation results are consistent with the theoretical predictions，clearly demonstrating the influence of different parameters on the characteristics of diffraction fringes．Moreover，the calculation error of the grating constant is relatively low，verifying the accuracy of the program．This simulation tool effectively overcomes the limitations of traditional experiments，provides a platform for independent exploration of diffraction laws，helps deepen the understanding of grating spectral characteristics，and at the same time provides efficient auxiliary means for related experiments．
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Published: 25 October 2025
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