Signal distortion analysis of autodyne microwave vibration sensors

The features of signal formation on amplitude and frequency changes of oscillations in an autodyne oscillator being under the influence of reflected electromagnetic radiation from the reflecting vibrating object are considered. Calculations of the harmonic coefficients and relative amplitude of the first harmonic of the signals depending on the amplitude of vibration for different operating points were performed. The recommendations for the proper selection of the operating point were developed, the possibility of dynamic range extension of autodyne vibration parameter meter is shown, microwave oscillator frequency stabilization with the external high-Q resonator is proposed.