Confronto fra due apparecchiature commerciali per la misura della velocità della luce

In the research shown in this article the speed of the light in the air was determined by two different methods and by the use of the instruments provided by Leybold for both the experiments. In both the experiments we indirectly measured the time taken by a light beam to cover fixed distance. The essential difference in the two methods consists in the techniques of indirect measurement of time; as a matter of fact, in the first experiment the time was correlated to a deflection of a laser beam, while in the second one such time was transformed into a phase delay of an sinusoidal electric signal. The speed of the light in the air was determined with an 10% of relative error.