Method for contactless measuring of vibrations of a rotating body

摘要

Stationary sensors (C1 to C8) are used to measure periodically the vibratory motions of portions (2) of a body (3) spinning in front of them, such as blades, and to try to determine their natural frequencies by spectral analyses. According to the invention, the sensors are collected together in several networks of different numbers and the determination consists of a comparison of the spectra of the different networks via different operations of selection and rejection of lines. The process appreciably pushes back the limit of unambiguous frequency detection.