基于数字图像处理技术的透镜焦距测量

摘要

针对光学透镜的焦距和后焦距的测量问题，设计了一套由平行光管和自准直仪组成的检测系统。基于数字图像处理技术，解决了测量系统中的自动对焦和双缝图像间距检测两个关键技术问题。实验结果表明，焦距的测量误差小于0.14%，后焦距的测量误差小于0.21%，能够满足一般工业检测需求。%A measurement system consisting of collimator and autocollimator is designed in this study for measuring the focal length and back focal length of optical lenses. The key techniques, autofocusing and distance determination of the double-slit image, are realized by using digital image processing. The experimental results indicate that the measurement error of focal length and back focal length are less than 0.14%and 0.21%, respectively.