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ISSN 2415-3400 (Online)
ISSN 1028-821X (Print)

THERMAL ACTION OF MICROWAVE RADIATION ON A VERY THIN CONDUCTING FIBRE

heading: 
SOLID-STATE AND PLASMA RADIOPHYSICS
Kokod, ii, NG, Kaydash, MV, Pogorelov, SV
Organization: 

V. N. Karazin Kharkiv National University
4 Svobody Sq., Kharkiv, 61022, Ukraine
E-mail: kokodiyng@gmail.com

 

National University of Pharmacy
53, Pushkinska str, Kharkiv, 61002, Ukraine
E-mail: marpog2000@gmail.com
https://doi.org/10.15407/rej2018.03.003
Language: Russian
Abstract: 

 

The subject and purpose. The experimental findings of a new physical effect of a strong interaction of microwave radiation with very thin (d << l) conducting fibers are presented in the paper. The calculations show that the absorption efficiency factor of fiber of a diameter of several micrometers when exposed to radiation in the centimeter range can reach the value of several hundred. 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 with a diameter of 12 μm has been carried out.

Methods and methodology. To determine the absorption of radiation in a fiber the change in the resistance of the fiber when heated by radiation was measured. To reduce the error of the results, the average value of resistance for 1 minute was measured. The resistance was measured at a frequency of 2 Hz. A thermal picture of the heated fiber was observed by means of a thermal imager. A mathematical model of the fiber heating process by the radiation beam is developed.

Results. The experiment has showed that a graphite fiber with a diameter of 12 μm absorbs about 10 % of the energy of the incident microwave beam with a wavelength of 1 cm. The heating temperature at the place of incidence of the beam reaches 200 °C. The developed mathematical model describes the interaction process of radiation and fiber well.

Conclusion. The results of the study confirmed the existence of a strong interaction of microwave radiation with very thin conducting fibers. The effect can find application in installations where it is necessary to transfer energy of electromagnetic radiation to small targets. Another area of usage of this effect is the creation of protective screens against the effects of microwave radiation on a person or on different installations.
Keywords: absorption efficiency factor, heating, microwave radiation, thin fiber

Manuscript submitted 08.05.2018
PACS: 42.25.Bs, 78.20.Nv​
Radiofiz. elektron. 2018, 23(3): 3-8
Full text  (PDF)

References: 
  1. Kuz’michev, V. M., Kokodiy, N. G., Safronov, B. V., Balkasin, V. P., 2003. Values of the absorption efficiency factor of a thin metal cylinder in the microwave band. J. Commun. Technol. El., 48(11), pp.1240–1242.
  2. Kokodiy, N. G., 2006. Microwave radiation absorption in an ultrathin double-layer cylinder. J. Commun. Technol. El., 51(2), pp. 175–178. DOI: https://doi.org/ 10.1134/ S1064226906020069
  3. He, S., Shulga, S. N., Kokodity, N. G., Gorobets, N. N., Kiiko, V. I., Butrym, A. Yu., Zheng, Y., 2011. Interaction of electromagnetic waves in a waveguide with very thin wires. J. Commun. Technol. El., 56(10), pp. 1193–1196. DOI: https://doi.org/10.1134/ S1064226911100123
  4. Akhmeteli, A., Kokodiy, N. G., Safronov, B. V., Balkashin, V. P., Priz, I. A., Tarasevitch, A., 2013. Efficient non-resonant absorption in thin cylindrical targets: experimental evidence for longitudinal geometry. ArXiv, [online] Available at: <https://arxiv.org/pdf/ 1208.0066v4.pdf> [Accessed 7 March 2014]
  5. Kokodii, N. G., Kaydash, M. V., Timaniuk, V. A., 2017. Interaction of electromagnetic radiation with a thin metal wire in the case of a glancing incident wave. J. Commun. Technol. El., 62(3), pp. 205–211. DOI: https://doi.org/10.7868/ S0033849417030123
  6. Wait, J. R., 1955. Scattering of a plane wave from a circular dielectric cylinder at oblique incidence. Can. J. Phys., 33(5), pp. 189–195. 
  7. Lind, A. C., Greenberg, J. M, 1966. Electromagnetic scattering by obliquely oriented cylinders. J. Appl. Phys., 37(8), pp. 3195–3203. 
  8. Kokodii, N. G., Natarova, A. O., Timanyk, V. A., Priz, I. A., 2017. Flexible protecting screens for microwave band on the basis of thin conducting fibers. Radiofiz.
    Elektron.    , 22(2), pp. 79-84. DOI: https://doi.org/10.15407/rej2017.02.079
  9. Bosworth, R.C.L., 1952. Heat transfer phenomena. The flow of heat in physical systems. New York: John Wiley and Sons.