Development of a Ferrite-Based Electromagnetic Wave Detector

[摘要] Direct detection of hydrocarbon by an active source using electromagnetic (EM) wave termed Sea Bed Logging (SBL) has shown very promising results. However, currently available electromagnetic wave technology has a number of challenges including sensitivity and lapsed time. Our initial response to this issue is to develop a ferrite-based EM wave detector for Sea Bed Logging (SBL). Ferrite bar andcopperrings in various diameters were used as detector 1 (D1). For Detector 2 (D2), toroid added with copper wires in different lengths at thecentreof it were used. The first experiment is to determine the inductance and resistance for both detectors by using LCR meter. We obtained the highest inductance value of 0.02530 mH at the ferrite bar when it was paired with a 15 cm diametercopperring and 0.00526 mH for D2 using a 100 cm copper wire placed at thecentreof thetoroid . The highest resistivity for D1 was measured at ferrite bar paired with a15 cmdiameter copperring and 1.099 Ω when using20 cmlength of copper wire. The second interest deals with voltage peak-to-peak (V p-p ) value for both detectors by usingoscilloscope . The highest voltage value at the ferrite bar of D1 was 25.30 mV. While at D2, the highest voltage measured was 27.70 mV when using a 100 cm copper wire. The third premise is the comparison of sensitivity and lapsed time for both detectors. It was found that D1 was 61% more sensitive than D2 but had higher lapsed time than D2.

[学科分类] 机械工程学

[关键词] Sea Bed Logging;Detector;Sensitivity;Lapsed time