Abstract: A magnetic induction based underwater communication
link is evaluated using an analytical model and a custom
Finite-Difference Time-Domain (FDTD) simulation tool. The
analytical model is based on the Sommerfeld integral, and a full-wave
simulation tool evaluates Maxwell’s equations using the FDTD
method in cylindrical coordinates. The analytical model and FDTD
simulation tool are then compared and used to predict the system
performance for various transmitter depths and optimum frequencies
of operation. To this end, the system bandwidth, signal to noise
ratio, and the magnitude of the induced voltage are used to estimate
the expected channel capacity. The models show that in seawater, a
relatively low-power and small coils may be capable of obtaining a
throughput of 40 to 300 kbps, for the case where a transmitter is at
depths of 1 to 3 m and a receiver is at a height of 1 m.
Abstract: This paper outlines the basic installation and operation of magnetic inductive flow velocity sensors on large underground cooling water pipelines. Research on the effects of cathodic protection as well as into other factors that might influence the overall performance of the meter is presented in this paper. The experiments were carried out on an immersion type magnetic meter specially used for flow measurement of cooling water pipeline. An attempt has been made in this paper to outline guidelines that can ensure accurate measurement related to immersion type magnetic meters on underground pipelines.
Abstract: The article presents the concept of an electromagnetic
circuit generator with permanent magnets mounted on the surface
rotor core designed for single phase work. Computation field-circuit
model was shown. The spectrum of time course of voltages in the
idle work was presented. The cross section with graphically
presentation of magnetic induction in particular parts of
electromagnetic circuits was presented. Distribution of magnetic
induction at the rated load point for each phase was shown. The time
course of voltages and currents for each phases for rated power were
displayed. An analysis of laboratory results and measurement of load
characteristics of the generator was discussed. The work deals with
three electromagnetic circuits of generators with permanent magnet
where output voltage characteristics versus rated power were
expressed.
Abstract: Aiming the application of localized hyperthermia, a
magnetic induction system with new approaches is proposed. The techniques in this system for improving the effectiveness of localized hyperthermia are that using magnetic circuit and the multiple-coil array instead of a giant coil for generating magnetic field. Specially, amorphous metal is adopted as the material of magnetic circuit. Detail
design parameters of hardware are well described. Simulation tool is
employed for this work and experiment result is reported as well.