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Thermoacoustic Method for Detection of Powerful Microwave Pulses

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Radiophysics and Quantum Electronics Aims and scope

Abstract

We propose a method for detection of the envelope of a microwave nanosecond pulse, which is based on the effect of generation of sound pulses resulting from absorption of electromagnetic waves. We show that to reproduce exactly the envelope shape of a short microwave pulse, it is necessary that the wave be absorbed in a layer of thickness much less than the product of the sound speed and the pulse duration. In searching for conditions ensuring this, we study the process of thermoacoustic generation in thin metal films deposited on quartz substrates. Measurements performed at a wavelength of 8 mm show that the absorption coefficient is maximum if the aluminum-film thickness is 22–25 Å. The maximum absorption coefficient amounts to 49% if the wave is incident from the quartz-substrate side. It is important that in this case, the wave reflection coefficient does not exceed 44%, whereas an aluminum plate reflects almost completely (99.8%) the incident-wave power. The phenomena observed in thin metal films are explained theoretically in terms of the anomalous skin effect. An experimental setup for a study of generation of ultrasonic signals by powerful microwave pulses is described.

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Authors and Affiliations

  1. M. V. Lomonosov State University, Moscow, Russia

    V. G. Andreev & A. A. Karabutov

  2. Institute of Radioengineering and Electronics of the Russian Academy of Sciences, Moscow, Russia

    V. A. Vdovin

Authors
  1. V. G. Andreev
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  2. V. A. Vdovin
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  3. A. A. Karabutov
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Andreev, V.G., Vdovin, V.A. & Karabutov, A.A. Thermoacoustic Method for Detection of Powerful Microwave Pulses. Radiophysics and Quantum Electronics 46, 707–712 (2003). https://doi.org/10.1023/B:RAQE.0000025001.91842.70

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  • DOI: https://doi.org/10.1023/B:RAQE.0000025001.91842.70

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