ROTHBERG, S. and HALLIWELL, N.A., 1994. Vibration measurements on rotating machinery using laser doppler velocimetry. American Society of Mechanical Engineers (ASME) Journal of Vibration and Acoustics, 116 (3) pp. 326-331.
This paper explores the use of laser vibrometry for vibration measurement directly from a rotating component. The presence of a surface velocity component due to the rotation itself is shown to create a strong measurement dependency on vibration perpendicular to the intended measurement direction. Particular ambiguity results at synchronous frequencies. A mathematical means to resolve the genuine vibration components from two simultaneous laser vibrometer measurements is presented and shown to be effective in the study of nonsynchronous rotor vibrations.