Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 10, Issue 20, 3 October 1974
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Volume 10, Issue 20
3 October 1974
Image of a coil in relation to the gauging of distance of metal surfaces
- Author(s): H. Sutcliffe
- Source: Electronics Letters, Volume 10, Issue 20, p. 409 –410
- DOI: 10.1049/el:19740326
- Type: Article
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The impedance of a circular loop in the presence of a plane metal surface is discussed, and it is shown to have certain features relevant to the use of coils as distance gauges. These features permit the elimination of those gauging errors that arise from the finite conductivity and permeability of the metal.
Low-loss optical glass fibre with Al2O3-SiO2 core
- Author(s): S. Kobayashi ; H. Nakagome ; N. Sh Mizu ; H. Tsuchiya ; H. Izawa
- Source: Electronics Letters, Volume 10, Issue 20, p. 410 –411
- DOI: 10.1049/el:19740327
- Type: Article
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–411
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Optical glass fibres, consisting of an Al2O3-SiO2 core and SiO2 cladding, were produced by using a glass growth technique of vapour deposition in a flame. The core measured from 4 to 10 μ in diameter, and the difference in refractive index between the core and the cladding was 0.003. The lowest loss of this fibre was 10 dB/km at 0.66 μm.
Rain-induced crosspolarisation and raindrop canting
- Author(s): G. Brussaard
- Source: Electronics Letters, Volume 10, Issue 20, p. 411 –412
- DOI: 10.1049/el:19740328
- Type: Article
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A discussion is given on the effect of wind on raindrops. It is shown that wind in itself cannot be a cause of raindrop canting. Vertical wind gradients are shown to produce a horizontal force on the drops, resulting in a canting angle. Calculations, based on a general model for wind gradients between 10 and 200 m for strong winds, show that canting angles of several degrees are possible.
Programmable cellular array for sequential-machine realisation
- Author(s): E.W. Page
- Source: Electronics Letters, Volume 10, Issue 20, p. 413 –414
- DOI: 10.1049/el:19740329
- Type: Article
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A programmable cellular array for the realisation of arbitrary synchronous sequential machines is presented. This approach to machine realisation is based on the use of a state assignment that yields excitation and output functions in a form suitable for implementation via a cellular structure.
Linear scale-factor error and optimum filter bandwidth for correlation accuracy
- Author(s): R.F. Webber and W.H. Delashmit
- Source: Electronics Letters, Volume 10, Issue 20, p. 414 –415
- DOI: 10.1049/el:19740330
- Type: Article
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Theoretical results are presented for the effect of linear scale factor on the alignment accuracy of two 1-dimensional random signals. For the low-signal/noise-ratio Gaussian correlation function, the optimum resolution is obtained as T|ε|/√6, where T is the map length and ε is the fractional scale-factor error.
Propagation in two circular coaxial waveguides
- Author(s): I.I. Rabinowitz and J.A. Staniforth
- Source: Electronics Letters, Volume 10, Issue 20, p. 415 –417
- DOI: 10.1049/el:19740331
- Type: Article
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Two variants of the circular waveguide loaded with a coaxial dielectric rod are discussed. The first has conducting hoops around the rod, the second has conducting discs across the rod, the planes of the closely spaced hoops or discs being normal to the waveguide axis. The characteristic equations for the two systems are given, and a consistent mode notation is suggested.
High-repetition-rate step-recovery-diode monostable circuits
- Author(s): J.M. Coles and R.J. Smith-Saville
- Source: Electronics Letters, Volume 10, Issue 20, p. 417 –418
- DOI: 10.1049/el:19740332
- Type: Article
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Improved step-recovery-diode timing circuits are described that have very fast recovery time and freqency-invariant timing period. Output pulse durations from 2 to 100 ns may be generated with less than 10% variation over the frequency range 1–40 MHz.
Method for weighted charge summation in bucket-brigade circuits
- Author(s): V. Székely
- Source: Electronics Letters, Volume 10, Issue 20, p. 418 –419
- DOI: 10.1049/el:19740333
- Type: Article
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The letter demonstrates that the bucket-brigade circuit can be built with an arbitrary capacitive m-pole instead of the simple capacitance array. This capacitive m-pole is suitable for realising weighted charge summation, which is a requirement for transversal-filter applications of bucket-brigade circuits.
Moving-average output interface for digital stochastic computers
- Author(s): A.J. Miller ; A.W. Brown ; P. Mars
- Source: Electronics Letters, Volume 10, Issue 20, p. 419 –420
- DOI: 10.1049/el:19740334
- Type: Article
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A new logic circuit suitable for use as an output interface for digital stochastic computers is presented. The logic element is based on the theory of moving averages, and is demonstrated to provide a significant improvement in transient-response characteristics, without loss in accuracy.
Monolithic polycrystalline-silicon pressure transducer
- Author(s): J.M. Jaffe
- Source: Electronics Letters, Volume 10, Issue 20, p. 420 –421
- DOI: 10.1049/el:19740335
- Type: Article
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A monolithic pressure transducer using polycrystalline silicon for both the diaphragm material and an integral piezoresistor has been fabricated. The device can be made with good repeatability and with easily varied diaphragm thickness. Electrical-output linearity is very good over a pressure range of 0–11 cm Hg for a 2.4 μm diaphragm having an area of 0.00136 cm2.
Algebraic analysis of sequential circuits
- Author(s): B.J.L. Saxby
- Source: Electronics Letters, Volume 10, Issue 20, p. 421 –423
- DOI: 10.1049/el:19740336
- Type: Article
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An algebraic technique is described that transforms the excitation equations derived from the topology of a sequential circuit into a formal operational model, e.g. a state-transition table, required for analysis. An algebraic form of such a model is suggested. The analysis applies for asynchronous and synchronous networks.
Solution of the coupled-mode equations in terms of redefined even- and odd-mode waves
- Author(s): B.J. Orth and R.A. Speciale
- Source: Electronics Letters, Volume 10, Issue 20, p. 423 –424
- DOI: 10.1049/el:19740337
- Type: Article
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The recently introduced new definition of the fundamental even- and odd-mode waves for nonsymmetrical parallel coupled lines in nonhomogeneous media is proved to verify the coupled-mode form of the differential wave equations under only one restriction, defined as the condition of congruent nonsymmetry.
Erratum: New theory of internal Q switching in semiconductor lasers
- Author(s): S. Gründorfer ; M.J. Adams ; B. Thomas
- Source: Electronics Letters, Volume 10, Issue 20, page: 424 –424
- DOI: 10.1049/el:19740338
- Type: Article
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