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Telecommunications and Radio Engineering

Publicado 12 números por año

ISSN Imprimir: 0040-2508

ISSN En Línea: 1943-6009

SJR: 0.185 SNIP: 0.268 CiteScore™:: 1.5 H-Index: 22

Indexed in

THERMAL ACTION OF MICROWAVE RADIATION ON A VERY THIN CONDUCTIVE FIBER

Volumen 77, Edición 19, 2018, pp. 1719-1727
DOI: 10.1615/TelecomRadEng.v77.i19.40
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SINOPSIS

The paper presents experimental findings of a new physical effect arising as a result of a strong interaction of microwave radiation with very thin (d << λ) conductive fibers. The calculations show that the absorption efficiency factor of a fiber having a diameter of several micrometers, being exposed to radiation in a centimeter range, can reach the value of several hundreds. It was found that the effect can be enhanced by oblique incidence of the radiation beam. An experiment to measure the absorption of microwave radiation with a wavelength of 1 cm in a graphite fiber of 12 μm in diameter has been carried out. To determine the radiation absorption in a fiber its resistance changing under radiation heating was measured. To reduce the error of results, the average value of resistance for 1 minute with a frequency of 2 Hz was measured. A thermal image of the heated fiber was observed using a thermal imager. A mathematical model of the process of fiber heating with a radiation beam has been developed. It has been shown experimentally that a graphite fiber with 12 μm in diameter absorbs about 10% of the energy of the incident microwave beam having a wavelength of 1 cm. The heating temperature at the beam incidence point reaches 200 °C. The developed mathematical model describes well the radiation-fiber interaction process. Investigation results confirm the existence of a strong interaction between the microwave radiation and very thin conductive fibers. The effect under consideration can be applied in facilities in order to transfer the electromagnetic radiation energy for small targets. Another use of this effect is the creation of protective screens against the microwave radiation effect on humans or on different facilities.

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