Patent ID: 8814805
Filing Date: 2014-08-26
Classification: A61B,G01S

Abstract:
1. A method for recovering a detected signal in non-contact vibration detection, comprising: reconstructing a complex signal from an I channel and a Q channel for a received reflected signal to create a reconstructed complex signal; applying a Fourier transform to the reconstructed complex signal to obtain a detected spectrum; extracting phase angle information of the reconstructed complex signal from the detected spectrum; and obtaining original vibration information by analyzing the phase angle information, wherein reconstructing the complex signal from the I channel and the Q channel is performed using the following relation:  where S(t) is the reconstructed complex signal, x  where J  are the DC components of the signals in I and Q channels, respectively, wherein reconstructing the complex signal from the I channel and the Q channel for a received reflected signal to create the reconstructed complex signal comprises reconstructing the complex signal from the I channel and the Q channel for a received reflected signal to create the reconstructed complex signal via a non-transitory media storage device having machine-readable instructions stored thereon for reconstructing the complex signal from the I channel and the Q channel for the received reflected signal to create the reconstructed complex signal.