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目前,光速的测量已达到很高的精度。真空中光速的最可靠值为:c=299792.458±±0.001km/s。但是进行光速测量,往往需要复杂、昂贵的专用设备。用测电磁波频率及波长的方法虽然比较方便,但是不很直观。因此普通大学实验室中一般很少安排测量光速的实验。本文提出的测量光速的方法,只需实验室中的通用仪器,所用环形光纤延迟线价格亦较便宜,实验又很直观,简单易行,所以可用作为大学物理实验中的一个普通光学实验。
At present, the measurement of the speed of light has reached a high degree of precision. The most reliable value of the speed of light in vacuum is: c = 299792.458 ± 0.001km / s. However, the speed of light measurement often requires complicated and expensive special equipment. Although the method of measuring the frequency and wavelength of electromagnetic waves is convenient, it is not very intuitive. Therefore, ordinary university laboratories rarely arrange experiments to measure the speed of light. The proposed method for measuring the speed of light requires only a general-purpose instrument in a laboratory. The ring-shaped fiber delay line used is cheaper and the experiment is very intuitive and simple. Therefore, it can be used as an ordinary optical experiment in a university physics experiment.