Dynamic threshold-based dual-optical fiber bundle tip timing measurement method

The invention relates to a dynamic threshold-based dual-optical fiber bundle tip timing measurement method. According to the method, a dual-optical fiber bundle tip timing sensor structure is designed; the distance of spatial phase shift between optical fiber bundles is fixed; and each optical fiber bundle can independently sense light intensity signals; tip timing signals are triggered with the intersection point of the light intensity signals of the two optical fiber bundles adopted as a dynamic threshold, and a blade arrival time point can be judged. The dynamic threshold double-optical fiber bundle tip timing measurement method can theoretically eliminate the influence of blade tip gap change on the tip timing signals, suppress timing uncertainty caused by environmental noises and thelike, and improve tip timing accuracy compared with a method which triggers tip timing signals with a fixed threshold. The method of the invention has the advantages of high precision, high reliability and the like. 种基于动态阈值的双