Phase Registration of Disturbances in Fluctuating Media Using a Spatially Separated Radio-Acoustic Generator

Research in the field of monitoring and registration of geophysical disturbances being a complex scientific and technical problem of great importance has been carried out. Disturbances of fluctuating media have a significant impact on the functioning of technical systems for control, safety, navigation, communications, etc. For this reason, the development of methods and tools for monitoring and registration of geophysical disturbances is an urgent task in many fields of science and technology. The article discusses a method for registering geophysical disturbances in fluctuating media using a spatially separated radio-acoustic generator. The method for registering geophysical disturbances is based on comparing the phase of an acoustic signal received from a fluctuating medium with the phase of a signal emitted into a controlled medium. The output signal of the phase detector is a DC voltage, described by a monotonic function of the phase difference of the input signals. A condition for self-excitation of a spatially separated radio-acoustic generator, which is determined by the general solution of the transient component of a second-order differential equation, is formulated. Block diagrams of the technical implementation of the method are presented. The principle of disturbances registration is based on the comparison of the phases of signals received and emitted into the controlled medium. Based on the results of the experimental study, a phase diagram of the output signal of the phase detector is presented as a response to the throwing of objects of various sizes into the area of acoustic beam propagation. The results of the study are relevant for the following areas of application: sounding of continental sea and ocean shelves, monitoring of vortex and turbulent disturbances in the airspace of airport runways, control of sea waves and underwater currents in the waters of seaports, detection of foreign objects in protected areas.