Patent ID: 9689738
Date: 2017-06-27
CPC Classifications: G01H

Claim:
1. A method for processing signals associated with a plurality of vibrometry beams, comprising: filtering each signal with a plurality of anti-aliasing filters; digitizing each signal with a plurality of analog-to-digital converters; applying amplitude correction to each digitized signal; removing portions of each digitized signal that are corrupted; transforming each digitized signal to a spectral domain; combining the spectral domain signals associated with the plurality of vibrometry beams into a single combination signal, wherein the spectral domain signals are combined to mitigate signal degradations; filtering the combination signal with a spectral domain filter; transforming the combination signal with an unshifted inverse transform to generate an unshifted time domain combination signal; applying a phase shift to the combination signal; transforming the phase-shifted combination signal with a shifted inverse transform to generate a shifted time domain combination signal, wherein the shifted time domain combination signal includes spectral components shifted 90 degrees in phase from the unshifted time domain combination signal; generating an instantaneous phase angle time series based on the unshifted time domain combination signal and the shifted time domain combination signal; unwrapping the instantaneous phase angle time series to generate a continuous time-angle series; isolating vibration components of the time-angle series; generating a separated vibration signal based at least in part on the isolated vibration components; processing the separated vibration signal with a spectral equalizer and an amplitude equalizer; converting the processed vibration signal to an analog vibration signal with a digital-to-analog converter; and outputting the analog vibration signal.