he BEX-8518, jointly developed by Brolight and Southeast University, received the First Prize in the Self-Made Instrument Competition of the 13th National University Physics Experiment Teaching Symposium. It is a new-generation photoelectric effect system for university physics education.
Traditional experiments rely on mercury lamps and bandpass filters, providing only five discrete wavelengths (365, 405, 436, 546, 577 nm). The BEX-8518 overcomes this using a reflective diffraction grating monochromator and a dual light source system (low-pressure mercury lamp + broadband LED), delivering continuously tunable monochromatic light across the visible spectrum. The mercury lamp enables wavelength calibration, while the LED provides continuous spectral scanning. The controller acquires photocurrent and stopping potential data for experiments including Planck's constant determination, spectral response characterization, and I-V curve measurement—all on a single apparatus that simultaneously demonstrates wave-particle duality.
All optical components are mounted on a precision optical breadboard with a fully visible optical path, allowing students to observe the complete collimation-dispersion-focusing sequence and eliminating the "black box" approach of traditional monochromators. The system supports both verification and inquiry-based experiments, suitable for general and modern physics lab courses.
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