Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 9, Issue 13, 28 June 1973
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Volume 9, Issue 13
28 June 1973
Equivalent-circuit model for interdigital transducers with varying electrode widths
- Author(s): A.J. Bahr and R.E. Lee
- Source: Electronics Letters, Volume 9, Issue 13, p. 281 –282
- DOI: 10.1049/el:19730204
- Type: Article
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p.
281
–282
(2)
A recently developed bulk-wave equivalent-circuit model that allows the electric fields in a transducer to be arbitrary functions of distance along the direction of acoustic propagation has been adapted for surface-acoustic-wave transducers. Experimental results are presented that confirm the validity of this model.
Electronic quencher for microdischarges in an industrial vacuum
- Author(s): R. Berland and A. Dussauchoy
- Source: Electronics Letters, Volume 9, Issue 13, p. 283 –284
- DOI: 10.1049/el:19730205
- Type: Article
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p.
283
–284
(2)
A simple circuit is presented that, connected in series with a hjgh-voltage generator, detects the appearance of a microdischarge (an incidental impulse current appearing in an industrial vacuum between metal electrodes subject to a high voltage), then quenches it by causing a brief fall in the voltage between the electrodes. It can lead to a reduction in the number of sparks observed.
Proportional electromyogram-controlled demand muscle stimulator
- Author(s): J.W. Moore and F.C. Monds
- Source: Electronics Letters, Volume 9, Issue 13, p. 284 –286
- DOI: 10.1049/el:19730206
- Type: Article
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p.
284
–286
(3)
A myoelectric-controlled stimulator that can sense biopotentials and deliver stimulus pulses to the patient through the same electrodes using time-sharing techniques is described. The stimulus is produced only when demanded, and its amplitude is proportional to the contraction causing this demand.
Rectangular universal cellular array
- Author(s): K.L. Kodandapani
- Source: Electronics Letters, Volume 9, Issue 13, p. 286 –287
- DOI: 10.1049/el:19730207
- Type: Article
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p.
286
–287
(2)
A rectangular universal cellular array consisting of cells having three inputs and one output is described. This array is based on the Reed-Muller canonical expansion of a switching function. Although the total number of external input pins required in this array is the same as that of a rectangular array proposed in the literature, the number of cells is very much less.
Natural frequencies of piecewise uniform transmission lines
- Author(s): B. Bianco and S. Ridella
- Source: Electronics Letters, Volume 9, Issue 13, p. 287 –288
- DOI: 10.1049/el:19730208
- Type: Article
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p.
287
–288
(2)
A transmission line composed of a number of cascaded uniform lines with different characteristic impedances and lengths is considered. Approximate expressions for the chain parameters and natural frequencies useful to a variational synthesis are given.
Glass-fibre waveguide with a triangular core
- Author(s): R.B. Dyott ; C.R. Day ; M.C. Brain
- Source: Electronics Letters, Volume 9, Issue 13, p. 288 –290
- DOI: 10.1049/el:19730209
- Type: Article
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p.
288
–290
(3)
A new form of glass-fibre waveguide is described that has a triangular core. Estimates for the higher-mode cutoff of the guide are compared with values obtained by computer and by experiment.
Construction of block error-detection and correction codes to any base
- Author(s): D.A.H. Brown
- Source: Electronics Letters, Volume 9, Issue 13, page: 290 –290
- DOI: 10.1049/el:19730210
- Type: Article
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p.
290
(1)
A method is given for constructing polynomial error-detection and correction codes to any base using the factorisation of the base into powers of its prime factors. A simple example of a (6, 3) true-decimal single-error-correcting code is given.
Comment on ‘Numerical calculation of Fourier-transform integrals’
- Author(s): W. Squire
- Source: Electronics Letters, Volume 9, Issue 13, page: 291 –291
- DOI: 10.1049/el:19730211
- Type: Article
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p.
291
(1)
Field-matching solution of transverse discontinuities in inhomogeneous waveguides
- Author(s): W.K. McRitchie ; M.M.Z. Kharadly ; D.G. Corr
- Source: Electronics Letters, Volume 9, Issue 13, p. 291 –293
- DOI: 10.1049/el:19730212
- Type: Article
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p.
291
–293
(3)
A mode-matching technique for analysing thin irises in homogeneous waveguides is extended for use in inhomogeneously filled waveguides. Numerical and experimental results are given for a thin iris in a dielectric-slab-loaded waveguide.
Scattering loss in a cladded-fibre optical waveguide
- Author(s): G.L. Yip ; J. Martucci ; G.W. Farnell
- Source: Electronics Letters, Volume 9, Issue 13, p. 293 –295
- DOI: 10.1049/el:19730213
- Type: Article
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p.
293
–295
(3)
An exact analysis using the Green's-function formulation of the problem of scattering from a local inhomogeneity inside a cladded-fibre waveguide is carried out, and yields a radiation loss higher than that evaluated from the infinite-medium approximation.
Low threshold-current density in 5-layer-heterostructure (GaAl)As/GaAs localised-gain-region injection lasers
- Author(s): G.H.B. Thompson and P.A. Kirkby
- Source: Electronics Letters, Volume 9, Issue 13, p. 295 –296
- DOI: 10.1049/el:19730214
- Type: Article
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p.
295
–296
(2)
Injection lasers have been constructed in which an active GaAs layer is sandwiched between a pair of (GaAl)As layers for carrier confinement and an outer pair of (GaAl)As layers of higher AlAs content for optical confinement. The minimum threshold-current density measured at 300 K. is 575±15 A/cm2 for 0.5 mm-long devices and 390 A/cm2 for lasers with four reflecting faces.
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