Patent ID: 7848896
Filing Date: 2010-12-07
Classification: G01H

Abstract:
1. A method for non-contact measurement of a periodic movement of a target, comprising: transmitting a radio frequency (RF) signal towards the target, wherein upon incidence of the radio frequency (RF) signal on the target a reflected radio frequency (RF) signal is produced; receiving the reflected radio frequency (RF) signal; down-converting the received radio frequency (RF) signal to a baseband signal; determining one harmonic of the baseband signal having an order n, where n is an integer; and determining an additional harmonic of the baseband signal having an order n+2; determining a model, wherein the model comprises a model ratio of the n+2 order harmonic and the n order harmonic as a function of model movement amplitude; determining an amplitude of a periodic movement of the target from the n+2 order harmonic of the baseband signal and the n order harmonic of the baseband signal, wherein determining the amplitude of the periodic movement of the target comprises: