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Radio and Electronic Engineer

Issue 6 • December 1969

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Displaying Results 1 - 10 of 10
  • Communicating facts

    Publication Year: 1969
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (149 KB)

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  • An investigation into the practicability of using an electromagnetic-acoustic probe to detect air turbulence

    Publication Year: 1969, Page(s):315 - 325
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1620 KB)

    This paper describes some theoretical and experimental investigations into the possible use of the reflexion of electromagnetic waves by an acoustic shock wave. Satisfactory detection of reflected microwave signals has been achieved in a number of experiments and the Doppler frequency shift of the signals has been shown to give a satisfactory indication of the wind velocity along the line of sight... View full abstract»

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  • Paper transistors

    Publication Year: 1969, Page(s):326 - 327
    IEEE is not the copyright holder of this material | PDF file iconPDF (332 KB)
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  • Reply: Paper transistors

    Publication Year: 1969, Page(s):327 - 328
    IEEE is not the copyright holder of this material | PDF file iconPDF (345 KB)
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  • Signal processing and computation using pulse-rate techniques

    Publication Year: 1969, Page(s):329 - 344
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2162 KB)

    Pulse-rate signals are introduced and the influence of various conventional circuits on their behaviour is considered. An introduction to more complex systems is given by considering the behaviour of certain simple feedback circuits. A survey is then made of the major applications of pulse-rate signals, including regular and stochastic rates, sampled systems, and the digital-differential-analyser.... View full abstract»

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  • A high speed, high accuracy, digitally-set potentiometer

    Publication Year: 1969, Page(s):345 - 351
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1071 KB)

    A digitally-set potentiometer (d.s.p.) is required for any hybrid computing arrangement where iterative routines are used to establish the solution to dynamic systems. If computing accuracies of 0.1% at signal frequencies of 10 kHz are to be obtained special techniques in the design of a d.s.p. are necessary. A complete design for a 10-bit d.s.p. to fit this specification is presented, based on th... View full abstract»

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  • High peak power from a CO2 laser system

    Publication Year: 1969, Page(s):354 - 356
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (422 KB)

    A CO2 laser oscillator/amplifier system which has produced peak output powers of 350 kW in 0.4 us long pulses is described. the output power achieved is shown to be in agreement with a theoretical equation. from these results and from the equation a new laser system has been designed, which it is hoped will produce more than 1 MW peak power. this new design is discussed. one problem associated wit... View full abstract»

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  • Gain saturation in CO2 laser amplifiers

    Publication Year: 1969, Page(s):357 - 360
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (441 KB)

    Gain saturation in the CO2 laser system presents a limitation on the amplification of Q-switched pulses and this has been studied in some detail. With pulses of around 0.5 ¿s saturation effects are observed at power densities of order 104W cm¿2. The results of a theory of the time dependence of saturation are presented, together with supporting experimental data. This theory indicates that, at h... View full abstract»

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  • A computer controlled train describer

    Publication Year: 1969, Page(s):361 - 368
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1471 KB)

    In modern railway signalling practice each train is allocated a code which describes its type, priority and route. the code is displayed on a schematic display diagram in the signal box and enables the signalman to set up the correct route for the train to follow. the description code on the diagram automatically follows the movements of the train, and in addition, is transmitted to the neighbouri... View full abstract»

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  • Design of a large read-only holographic memory

    Publication Year: 1969, Page(s):369 - 375
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1644 KB)

    Factors affecting the design of a read-only optical memory having a total capacity of the order of 108 bits with fast random access are discussed. Photographic information storage is used and random address selection is provided by a laser beam scanned across the photographic plate using non-mechanical beam deflection. `Page¿ organization of the memory involving parallel read-out of 104 bits from... View full abstract»

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