Showing papers on "Magneto published in 1972"

Magneto-plasma surface waves in solids

Abstract: The effect of a d.c. magnetic field on the dispersion relation of surface plasmons in a metal is studied. Numerical results, including the effects of retardation, are presented for both the Faraday and the Azbel-Kaner geometries.

Flywheel magneto ignition device with capacitor-thyristor ignition combined with generator

Abstract: A flywheel magneto ignition device with capacitor-thyristor ignition combined with generator comprises a first component group for producing an ignition effect and a second component group for generating current for lighting and/or battery charging purposes, the first component group comprising a rotor having mounted therein permanent magnets the pole of which are arranged to coact with coils containing at least one coil core and intended for the capacitor-thyristor-ignition circuit, and the second component group comprising a system of coils provided with iron cores and fixedly mounted in a rotating magnetic field from a body corotating with the rotor in the first component group, the rotor and the corotating body being mechanically connected together but with the respective magnetic fields shielded from each other.

Ignition system for internal combustion engines

Abstract: An ignition system for internal combustion engines which comprises a magneto electric generator having a generating coil for producing two output signals different in phase, a capacitor which will be charged and discharged to operate a high tension coil, a switching element for discharging the capacitor, and a control circuit for controlling the switching element, one of the two output signals charging the capacitor, the other output signal controlling the switching element through the control circuit with the results that the control voltage of the switching element is not affected by the ambient temperature and the ignition system is made smaller in size, is serviceable for preventing excessive rate of rotation of the combustion engine, and can be molded into one unit.

Ignition adapter circuit

Abstract: An electrical ignition system for adapting a conventional magneto spark ignition system to a capacitor discharge ignition system.

Free vibrations of an infinite isotropic magneto-thermo-elastic plate

Abstract: Free vibration modes of an infinite plate of magneto-thermo-elastic material has been considered. Frequency equations relating the wave number and the frequency of the waves are obtained for the symmetrical and antisymmetrical motions of the plate. Numerical results are presented for the structural aluminum alloy 24S-T4.

Magneto-Optics Theory

Abstract: The theoretical and experimental magneto-optical ( M / O ) characteristics of ferromagnetic films have been investigated extensively during the past decade. This resurgent interest in the field of magneto-optics is due primarily to its utilization for information retrieval in magnetic domain studies and possible application for optical beam memory systems.2 Of course, this revival would not have taken place without significant advancements in preparation techniques, development of new materials, and the advent of the laser. In addition, substantial theoretical knowledge has been acquired recently in the theory of enhancements as well as in an experimental appreciation of the practical difficulties encountered in constructing and operating M / O memory systems.\"lo The purpose of this paper is to review some of the theoretical aspects of the magneto-optics of ferromagnetic films with emphasis on optical enhancements. The classical phenomenological model of magneto-optics and the optics of plane-waves propagating in absorbing media are reviewed briefly for the unaware reader. The plane-wave theory of the magneto-optics of thick (opaque) and thin ferromagnetic films are discussed in detail. Several different magnetooptical signals produced by various photometric techniques for near and offnull detection are presented. The optical enhancements of M / O signals obtainable with a single thin film of typical Kerr and Faraday materials deposited on planar and prism substrates are compared.

Ignition system for internal combustion engines

Abstract: An ignition system has a capacitor charged by a magneto, and switch means responsive to magneto rotation and connected across said magneto for terminating charging of the capacitor before the capacitor is fully charged.

Flywheel magneto ignition apparatus operating with capacitive ignition effect

Abstract: A flywheel magneto ignition system includes a generator coil about which a magnetic field rotates, a first diode connecting a capacitor and the primary winding of an ignition coil to said generator coil, a second diode connected across said generator coil for conducting current pulses blocked by said first diode, a spark plug of the surface type connected in circuit with the secondary winding of the ignition coil, and a control member actuated in respnse to flywheel rotation for controlling current flow to the capacitor and primary winding, the control member being synchronized with the rotating field to initiate charging of the capacitor when a voltage pulse conducted by the second diode has just reached its maximum potential.

Magneto-optics: experimental.

Abstract: In this paper several experimental aspects of a magneto-optic (M/O) memory will be discussed. In principle, a physicist given a free hand in designing an M/O system, would start with the choice of materials, taking their basic parameters from the scientific literature, define some figure of merit, and proceed with determining the optimum M/O effect to be used. This type of analysis has already been extensively done.', 2 On such a basis one might tend to use some of the more exotic materials, such as FeBO,, :I or EuO:' However in the practical development of such a system one has to take into account several nonscientific criteria, such as time tables, availability of materials, reproducibility, etc. The system described here was developed in view of such criteria, and it is certainly not claimed that it is the best system from all points of view. It is presented here mainly as an illustration of the analytic and experimental methods which are of general value and can be applied in one form or another to any system. Holographic type memories are not included in this d i sc~ss ion .~~ The system described here was developed in order to evaluate the feasibility of an M/O video tape recorder. This choice was influenced to a large extent by the lack of a suitable random access light deflector. The advantages of such a system over a conventional tape instrument are that it is a noncontact method (thus avoiding wear problems) and that it promises higher information storage densities and transfer rates. Both recording and readout processes were required to be contactless. A high degree of symmetry of the two processes was desired in order to simplify the system; thus the same light source, optics and scanning device were envisioned for both processes. Hybrid techniques such as those using combined electron and optical beams 7* li were therefore ruled out. The main parts of the system are: (A) The light source. This has to be coherent in order to obtain high power densities with relatively low total input power. (B) Appropriate optical components for focusing, scanning and viewing. The optics should have diffraction limited capability for maximum resolution and maintain the proper state of polarization of the optical field. (C) The magnetic medium. It should be capable of accepting and storing information reversibly, it should have a strong enough M/O interaction to permit optical detection of its magnetic state, and it should be homogeneous and of good optical quality in order not to introduce an inordinate amount of noise. (D) Decoding optics and electronics capable of demodulating the signal from the optical beam and discriminating between signal and noise. (E) Mechanical tape transport and optical scanning and tracking. Con-