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Proceedings of the IEE - Part C: Monographs

Issue 16 • Date September 1962

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Displaying Results 1 - 25 of 48
  • The calculation of the electric field for an infinite dielectric plate between two spherical electrodes

    Publication Year: 1962 , Page(s): 293 - 298
    Cited by:  Papers (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (601 KB)  

    By considering the equipotential surfaces round two equal and opposite point charges, the electric field for an infinite dielectric plate between two spherical electrodes has been calculated. The solution is given as an infinite series in terms of applied voltage, radius of the electrodes, thickness of the dielectric plate, and permittivities of the plate and the medium. Curves have been derived t... View full abstract»

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  • Limits of accuracy in resistance measurement

    Publication Year: 1962 , Page(s): 299 - 306
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1037 KB)  

    The resolution that can be achieved in resistance measurement is shown to be limited by the amplitude of thermal noise relative to the input power of the resistance. The errors of measurement due to resolution and power loading are analysed and the minimum value of their sum is found to be proportional to the cube root of the circuit and detector noise factors, the detector bandwidth and the loadc... View full abstract»

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  • An alternating-current analogue of the Kelvin double bridge

    Publication Year: 1962 , Page(s): 307 - 316
    Cited by:  Papers (8)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1457 KB)  

    In connection with a project for an absolute determination of the ohm, the author has developed an a.c. 4-terminal resistance bridge. This new bridge is analogous to the Kelvin double bridge, but resistive ratio arms are replaced by transformer ratio arms and inductive dividers. Besides the benefits of impedance matching and ease of amplification which the use of alternating current confers, the r... View full abstract»

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  • High-sensitivity feedback relay amplifiers

    Publication Year: 1962 , Page(s): 317 - 322
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (655 KB)  

    High-sensitivity feedback relay amplifiers may be built with a hysteresis relay. It is possible to obtain a linear range which is not large compared with the hysteresis band. The design of these amplifiers is accomplished using the exponential input describing function. The accuracy of this design method is confirmed by experiment. View full abstract»

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  • Prediction of the time/current characteristics of a long cartridge fuse with a single-wire element

    Publication Year: 1962 , Page(s): 323 - 327
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (452 KB)  

    Numerous forms of solution for the electro-thermal equations of fuses, together with various methods for establishing the parameters of these equations, have been attempted. Following earlier work on the analytical determination of the characteristics of semi-enclosed oil-immersed fuses and short fuses enclosed in silica or quartz filler, a new method has been established for the solution of long ... View full abstract»

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  • The theory of Peltier- and Thomson-effect errors in thermal a.c.-d.c. transfer devices

    Publication Year: 1962 , Page(s): 328 - 334
    Cited by:  Papers (18)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (873 KB)  

    The reversal differences and non-frequency-dependent transfer errors appearing in thermal a.c.-d.c. transfer devices are known to be due to Peltier and Thomson heating. General expressions have been derived for the transfer errors due to these effects in vacuo-thermo-junctions, taking into consideration the effect of the thermal conductance due to the mid-point thermocouple. The analysis has been ... View full abstract»

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  • Reflection and transmission of an electromagnetic wave by a gaseous plasma

    Publication Year: 1962 , Page(s): 335 - 348
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1370 KB)  

    The paper reports a study of a one-dimensional model of the interaction of an electromagnetic wave and the plasma of an ionized gas in the absence of a static magnetic field. It is shown that the reflection and transmission coefficients at the boundary of a semi-infinite plasma can be usefully discussed in terms of the Smith chart of transmission-line practice. A plasma of finite thickness is then... View full abstract»

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  • The conductivity of oxide cathodes. Part 13: Thermal disruption of the matrix

    Publication Year: 1962 , Page(s): 349 - 356
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1378 KB)  

    The Joule heating of a matrix, resulting from inelastic collisions of electrons against the hollow-pore walls, is not a uniform phenomenon but tends to concentrate on a relatively small number of particles. These preferred particles are raised in temperature much above the ambient temperature of the matrix and are accordingly subject to an accelerated rate of thermal dissociation. By suitable expe... View full abstract»

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  • Discussion on ¿The conductivity of oxide cathodes. Part 13: Thermal disruption of the matrix¿

    Publication Year: 1962
    Save to Project icon | PDF file iconPDF (157 KB)  
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  • Single-balanced rectifier modulators. An analysis which includes the effect of changing the mark/space ratio of the switching signal

    Publication Year: 1962 , Page(s): 357 - 364
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (743 KB)  

    The practically useful forms of series modulator are analysed, the results for the corresponding shunt modulators being shown to be readily derivable. The analysis of several of the circuits is carried out in a simpler manner than hitherto, and yet in all cases is sufficiently general to allow the variation of the mark/space ratio of the switching signal. It is shown that, in modulators with high ... View full abstract»

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  • Vibratory power convertor systems

    Publication Year: 1962 , Page(s): 365 - 379
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1745 KB)  

    A brief description of the underlying principles involved in vibratory power convertor systems is given, and then formulae are derived for use in system analysis and design. These consist of expressions which enable the compliance forces and effective masses of two different arrangements of conventional systems to be determined under all conditions throughout the cycle of vibration, and equations ... View full abstract»

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  • Harmonics in a.c. rotating machines

    Publication Year: 1962 , Page(s): 380 - 387
    Cited by:  Papers (3)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1043 KB)  

    A general approach to harmonic phenomena in a.c. rotating machines is developed. A flux-density component, b = B sin (k¿t ± q¿s + ÿ), where k and q are integral constants, is taken as the central concept-This b-distribution is, in general, harmonic in time and space, and a series of such components can represent any cyclic flux distribution encountered. The effects of such a field in regard to... View full abstract»

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  • Network properties of discontinuities in multi-mode circular waveguide

    Publication Year: 1962 , Page(s): 388 - 400
    Cited by:  Papers (8)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1564 KB)  

    The paper snmmarizes theoretical techniques for the evaluation of the network parameters of obstacle and aperture discontinuities situated in a uniform multimode waveguide. The formulation is valid for arbitrary waveguide cross-sections and for any finite number of propagating modes. After the rigorous formulation of the network parameters in the form of a scattering matrix, various approximate me... View full abstract»

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  • A new waveguide method for measuring the permittivity of dielectric slabs

    Publication Year: 1962 , Page(s): 401 - 405
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (530 KB)  

    The paper describes a new waveguide method for measuring the complex relative permittivity of dielectric slabs. The slab is mounted in rectangular waveguide either on the waveguide axis or in contact with the side wall. One end of the slab contacts a fixed short-circuit plate. By using a standing-wave detector, the condition is found for the guide wavelength in the dielectric section to equal the ... View full abstract»

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  • Analogue treatment of eddy currents and magnetic flux penetration in saturated iron

    Publication Year: 1962 , Page(s): 406 - 411
    Cited by:  Papers (4)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (716 KB)  

    The paper shows the use of simple bridge-rectifier circuits to extend the RC-analogue representation of electromagnetic fields within conductors to the case in which the conductor may undergo magnetic saturation. The technique is illustrated by solving the circuit problem corresponding to an idealized B/H curve, and obtaining agreement with the known field solution for this case. It is then shown ... View full abstract»

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  • The sequential generating filter

    Publication Year: 1962 , Page(s): 412 - 418
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (730 KB)  

    The output of a linear network is the convolution of the input and the impulse response of the network. This fact can be used to produce a network with any specified impulse response, since the process of convolution consists of delay, multiplication and integration, all of which can be performed with electrical components. Two arrangements which convolute their input with an approximation to a pr... View full abstract»

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  • Double knife-edge diffraction in field-strength predictions

    Publication Year: 1962 , Page(s): 419 - 429
    Cited by:  Papers (18)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1140 KB)  

    The loss in signal strength by diffraction over two knife-edges in succession is solved, with the usual approximations, by a double application of Huyghens' principle expressed in terms of simple Fresnel theory. The solution is shown to depend on a Fresnel surface integral which will be discussed in a companion paper. Some typical curves of decibel loss as a function of knife-edge heights and posi... View full abstract»

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  • The Fresnel surface integral

    Publication Year: 1962 , Page(s): 430 - 437
    Cited by:  Papers (3)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (785 KB)  

    The Fresnel surface integral is defined as ¿ exp (j¿¿¿2)dS taken over a sector of infinite radius and of angle ¿, with its centre at a distance ¿0 from the origin of co-ordinates and with one of its boundaries lying on a radial drawn through the origin. Expansions are developed from which the integral can be computed for a given value of ¿ over the whole range of ¿0, by making use of the e... View full abstract»

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  • The basic theory of operation and control of a high-voltage direct-current power-transmission system and its implementation in a system analyser

    Publication Year: 1962 , Page(s): 438 - 446
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1291 KB)  

    An account is given of the principal features of the operation and control of a high-voltage direct-current power-transmission system, which is viewed as a tandem convertor consisting of a rectifier in series with an inverter. It is shown how the requirements for the grid control of the main and by-pass valves of the convertor are met in the design and construction of a system analyser with low-po... View full abstract»

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  • Determination of permittivity variations in the troposphere by scatter-propagation methods

    Publication Year: 1962 , Page(s): 447 - 455
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1291 KB)  

    An account of an experimental tropospheric scatter-propagation investigation is given. The theoretical background on which the experiments are based is briefly sketched, and the atmospheric permittivity distribution in a general form is discussed in some detail. Finally the results are presented of a set of experiments which are believed to contribute to the general understanding of the conditions... View full abstract»

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  • The e.m.f.s Induced in the armature coils of d.c. machines during commutation

    Publication Year: 1962 , Page(s): 456 - 474
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (2374 KB)  

    The paper deals with the problem of designing interpoles for d.c. machines so as to obtain a prescribed constant distribution of current between brushes and commutator¿for example, a uniform distribution. The procedure is to consider the hypothetical condition in which the current distribution is the prescribed one, the brush contact characteristic being known, and to distinguish the components o... View full abstract»

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  • The E.M.F. induced in the end-turns of armature coils during commutation

    Publication Year: 1962 , Page(s): 475 - 487
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1428 KB)  

    A method is developed for the calculation of the inductances of armature-coil end-turns of d.c. machines having strap windings. The calculation of the e.m.f.s induced in the end-turns during commutation is described for a prescribed form of current reversal. The calculated inductances may be used as input data for the analysis of commutation performance using electronic computers, as described in ... View full abstract»

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  • Electronic computers applied to commutation analysis

    Publication Year: 1962 , Page(s): 488 - 507
    Cited by:  Papers (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1885 KB)  

    The paper deals with the analysis of armature-coil currents and voltages during commutation, and bar-brush currents and voltages, for d.c. machines. The application of electronic digital and analogue computers to solution of the simultaneous differential equations for coil currents is described. It is assumed that the bar-brush dynamic contact conductance is directly proportional to the area of ge... View full abstract»

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  • The calculation of the magnetic field of rotating machines. Part 3: Eddy currents induced in a solid slab by a circular current loop

    Publication Year: 1962 , Page(s): 508 - 515
    Cited by:  Papers (3)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (912 KB)  

    The paper contains a detailed analysis of the eddy currents induced in a semi-infinite slab by a circular current outside the slab. Particular attention is paid to the magnetic field outside the slab, and the conditions are explained under which the method of images can be safely applied. The effective impedance of the slab is calculated, and the results are compared with recent experimental work.... View full abstract»

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  • The application of network analysis to the resistance network analogue and to relaxation procedures

    Publication Year: 1962 , Page(s): 516 - 526
    Cited by:  Papers (3)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1280 KB)  

    Networks used as practical aids to solving Laplace's equation are considered from the aspect of circuit theory. The possibilities of economy in network size and of exact simulation of truly infinite networks are pointed out. Calculations are presented for certain common network configurations, principally corresponding to 2-dimensional problems. View full abstract»

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