The difficulty of vibration non-contact measurement of the turbine rotor blade based on tip-timing was introduced. Breakthrough progress was made on the structure design

the installation on the casing and the cooling strategy of high temperature optical tip-timing sensor. The timing signal of H profile of turbine blades was acquired by setting signal hold time of the system for avoiding the secondary trigger

and a method of determining the revolution speed for the blade tip-timing system was proposed for core-engine. Such a tip-timing system was successfully used in the vibration monitoring of the turbine blades of core engine. The tip magnitudes and natural frequencies of the blades were successfully determined by the tip-timing system

and compared with the dynamic strain results from the traditional strain gage. The comparison results demonstrated that the non-contact measurement based on tip-timing and the contract measurement based on strain gage can successfully identify the vibration of turbine blades. The 1st bending mode of the turbine blades at about 8 200 r/min on was caused by engine order of 12. The relative error of the two methods in determining the 1st bending natural frequency of blades was less than 4%.