A continuous scanning laser Doppler vibration measurement method for three-dimensional operational deflection shape of a curved blade was proposed and applied to vibration test of a compressor blade. The image geometric transformation was introduced into the laser continuous scanning measurement

and a laser continuous scanning path algorithm capable of dealing with irregular geometries of curved blades was developed. The continuous scanning laser vibration test was applied to non-rectangular area

and its accuracy was verified by test. Based on this method

the approach for measuring three-dimensional operational deflection shape of curved blades was taken

and the coordinate decomposition principle of three-dimensional laser test was studied. The three-dimensional laser continuous scanning test was performed on a compressor blade and the first nine modes within 3600Hz were obtained. The correlation with the results from the commercial three-dimensional laser discrete scanning modal test was basically above 0.95

demonstrating the feasibility and accuracy of three-dimensional continuous scanning laser Doppler vibration test. The continuous scanning laser Doppler vibration measurement

with advantages of high spatial resolution

efficient and effective test

shows the practical value for further engineering application.