Using Hilbert Transform for Signal Processing in Mechanical Impedance Analysis

Abstract

These papers describe using of Hilbert transform in processing signal received from standard mechanical impedance sensor. It’s shown that Hilbert transform allows extract additional information from the signal and increase reliability of non-destructive testing. Presented mathematical model of typical signals received form mechanical impedance sensor and described ways to extraction and using in non-destructive testing process wide known characteristic of the signal like instantaneous phase and instantaneous frequency. Also described another parameters based on mentioned characteristics which are more stable in diagnostic decision-making compare to another widely used in contemporary flow detectors. Shown experimental results obtained from scanning samples of composite materials used in development of light-weight aircrafts.