Parametric Method for Detecting Hidden Subsurface Non-Metallic Pipelines

Abstract

The problems of detecting hidden subsurface non-metallic pipelines based on polyethylene, polystyrene polyvinyl chloride and polypropylene are considered. The electrical and magnetic parameters of the subsurface medium mainly coincide with the parameters of liquids and materials of pipelines, which does not allow to detect them using conventional metal detectors. It is proposed to detect not the pipeline material itself, but rather its content. A parametric method of detecting hidden subsurface nonmetallic pipelines based on the parametric properties of liquids in pipelines, which are manifested during forced polarization of the liquid by turning the magnetic axes of the protons of the liquid to a certain angle relative to the Earth’s magnetic field. Once the polarization pulse impact is over, there is a precession of the axes of the liquid protons in the direction of the Earth’s magnetic field. This leads to the appearance of a magnetic field of free nuclear precession with the Larmor frequency, which indicates the discovery of a hidden subsurface pipeline with liquid. The time of proton precession depends on the type of liquid and serves as a sign for recognizing the type of liquid in the pipeline. The purpose of the study is to develop a new method of detecting hidden subsurface non-metallic pipelines, based on specifics of the parametric properties of the liquids transported by them. The given parametric method has undergone experimental research and can be implemented in a serial sample of a means for detecting hidden subsurface non-metallic pipelines.