DEVELOPMENT OF A WEB-LIKE HEXAGON SHAPED ELECTROMAGNETIC (EM) TRANSMITTER

Direct detection of hydrocarbon using powerful electromagnetic (EM) source in
seabed logging (SBL) application has remained a challenge because the size of recent
transmitter is too huge. Thus, a new web like hexagon shaped transmitter is proposed
as a new invention, this is due to its abilities in concentrating the EM field on its
centre and minimizing the size of transmitter. Hexagon shape is the best design in
terms of radiation power with 579.86% compared to the dipole transmitter by using
Applied Wave Research (AWR) software. From Computer Simulation Technology
(CST) software, web like hexagon shape with 20 turns shows the 215.85% increasing
of electric field compared to 5 turns. Combination of EM transmitter with
Ni0.8Zn0.2Fe2O4 toroid could enhance the EM field at the transmitter. Hence, web like
hexagon shaped transmitter was constructed by using copper wire in diameter of 0.08
cm with 20 turns and comparison of magnetic field with and without magnetic feeder
were conducted. Ni0.8Zn0.2Fe2O4 nanoparticles were successfully synthesized using
self combustion technique. The samples were then sintered at 800 0C, 900 0C and
1200 0C for 4 hours respectively. All sintered samples exhibited single phase
Ni0.8Zn0.2Fe2O4 that was confirmed by the [311] plane as the major plane as revealed
by XRD results. The calculated average crystallites sizes for these three samples were
in the range of 20 – 50 nm determined using Scherer equations. Agilent LCR
Impedance Analyzer Meter was used to determine the magnetic properties of
Ni0.8Zn0.2Fe2O4 toroids which involved the measurements of initial permeability Qfactor
and relative loss factor (RLF). Finally, magnetic field of web like hexagon
shaped transmitter had increased by 1228.21 % at further offset by placing
Ni0.8Zn0.2Fe2O4 as a magnetic feeder for 20 turns.