本文介绍了一种利用傅立叶频谱测量球面透镜、柱面透镜及环曲面透镜单色光焦距的新方法,这种新方法不需要高精度的平行光管,用激光器作为光源,仪器调式简单,测量结果可靠,测量精度可达0.3%。如果采用光电扫描及微机处理,这种方法还可以实现自动化测量,而且可以测量不可见光工作情况下的透镜焦距。 This paper introduces a new method to measure the monochromatic focal length of spherical lens, cylindrical lens and toric lens by using Fourier spectrum. The new method does not need a collimator with high precision. Using a laser as a light source, the instrument is simple to measure, The results are reliable and the measurement accuracy can reach 0.3%. This method also enables automated measurements using opto-electronic scanning and computer processing, as well as measuring the focal length of the lens in invisible light conditions.