ANALYSIS OF 2D AND 3D SPECTRAL IMAGES FORMED FROM TRANSMITTED AND RECEIVED VOLTAGE OF STEEL PIPE PLACED ON FLAT SURFACE.

Abstract

This study makes use of frequency and voltage(100-200V) electromagnetic imaging instrument to image the position of the steel pipe. The methodology involved the transmission at 100V and 200V on traverses on 5.4” toroidal transmitter at frequencies 20, 40,80,100,160,200,250 and 300Hz along the surface in an open field. Microcontroller was used to process the data and the data were sent to the liquid crystal display (LCD) counter to display the voltage values. Various 2D and 3D spectral images were made from the measured voltages for steel pipe placed on the flat surface of the ground. The results obtained show that the measured values of receiver voltage are higher for long pipe and lower for short pipe. And as the frequency increases, the receiver voltage increases for all the frequencies at the traverses. The heavy concentration of hatch lines in the contour plots at various frequencies show the places where the steel pipe and other nearly metallic objects were located on the survey ground. T he 3D surface plots show many depressions where the steel pipes and other metallic objects were located on the experimental surface. This locally constructed instrument used in this study is useful for detecting metallic pollutants in the soil and will encourage more local research interest in applied instrumentation due to the fact that the electronic components used are available at cheaper rate in Nigeria.

Keywords: Analysis, spectral images, transmitted and received voltage, steel pipe, flat surface.