基于虚拟仪器的LED光电参数测试系统

在LED产业飞速发展的今天，LED的光学、色度学和电学参数的精确测试对于提高LED的产品质量、满足市场需求具有重要的意义。研究和分析了LED光学色度学电学参数标准化测量的原理、要求及实现方法，并据此设计并实现了光电算一体化的测试系统，使用NI USB6210数据采集卡在虚拟仪器平台上完成了数据采集、算法设计、界面设计的任务，能够根据所测光谱较好地实现对LED峰值波长、峰值波长半宽度、质心波长、色品坐标、纯度、相关色温、正向电压/电流等参数的综合测试。本系统具有界面简洁、算法可靠、结果稳定的优点，使用该系统分别测得五种单色LED的各项参数，测试结果的平均误差小于3%，可见其测试效果较理想，具有较好的一致性。

Photoelectric Parametric Test System of LED Based on Vi rtual Instrument

The standardized measuring principle, requirements and implementations of the above parameters of LEDs were researched and analyzed in the present paper. Then a comprehensive test system involved with optics, machinery and computer was designed to accomplish data acquisition, algorithm design and interface design on virtual instrument using NI data acquisition card USB6210. And convincing results of LEDs’ parameters, including peak wavelength, width of half-peak wavelength, centroid wavelength, chromaticity coordinates, purity, correlated color temperature and the forward voltage/current, were achieved with good consistency based on the measured spectrum. The system owns simple interface, reliable algorithms and stable results. Respective measurements on five kinds of color of LED result in an average error less than 3%, which show an ideal performance of the system.