Measurement of the microwave emitter's inhomogeneity using optical fiber DTS

Jakub Jaros; Martin Papes; Andrej Liner; Vladimir Vašinek; Pavel Smira; Andrea Nasswettrova; Jakub Cubik; Stanislav Kepak

doi:10.1117/12.2050278

18 June 2014 Measurement of the microwave emitter's inhomogeneity using optical fiber DTS

Jakub Jaros, Martin Papes, Andrej Liner, Vladimir Vašinek, Pavel Smira, Andrea Nasswettrova, Jakub Cubik, Stanislav Kepak

Author Affiliations +

Proceedings Volume 9098, Fiber Optic Sensors and Applications XI; 909815 (2014) https://doi.org/10.1117/12.2050278
Event: SPIE Sensing Technology + Applications, 2014, Baltimore, MD, United States

Abstract

Researcher’s teams were dealing with the microwave emitter’s inhomogeneity problem since the microwaves were used. One possible way, how to measure electromagnetic field is the measurement on inhomogeneous temperature distribution on the irradiated sample, which can cause problems as in other material processing, so in the undesirable change of properties and even security. Inhomogeneity of electromagnetic field is specific by creating spots with higher or lower temperature called “hot spots”. This inhomogeneity strongly affects the temperature distribution in the cross section of the material and its resultant heating. Given the impossibility of using classical electronic devices with metal temperature sensors were various indirect methods used in the past. This paper deals with experimental measurement of the microwave emitter’s inhomogeneity (2.45 GHz) using the optical fiber DTS. The greatest advantage of this sensor system is just in using of the optical fiber (electromagnetic resistance, small size, safety using in inflammable and explosive area, easy installation). Due to these properties of the optical fiber sensor it’s possible to measure the temperature of the sample in real time. These sensor are able to measure the temperature along the fiber, in some cases they use nonlinear effect in optical fiber (Raman nonlinear effect). The verification of non-homogeneity consists in experimental measuring of the temperature distribution within the wooden sample. The method is based on heat exchange in an isolated system where wooden sample serves as an absorber of the irradiated energy. To identify locations with different power density was used DTS system, based on nonlinear phenomena in optical fibers.

Citation Download Citation

Jakub Jaros, Martin Papes, Andrej Liner, Vladimir Vašinek, Pavel Smira, Andrea Nasswettrova, Jakub Cubik, and Stanislav Kepak "Measurement of the microwave emitter's inhomogeneity using optical fiber DTS", Proc. SPIE 9098, Fiber Optic Sensors and Applications XI, 909815 (18 June 2014); https://doi.org/10.1117/12.2050278

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