Low-Cost Instrument for Whispering Gallery Mode Thermometry up to 19 GHz


In this paper, a portable low-value system for the accurate measurement of advanced resonance frequencies up to nineteen GHz for whispering gallery mode thermometry is presented and validated. The instrument performs vectorial transmission measurements for the determination of resonance frequencies with accuracy in the order of a few elements in in over two completely different RF/microwave bands: 1) 800 MHz–seven GHz and 2) 13–19 GHz. The former band is suitable for quasi-spherical resonator (QSR)-based experiments, currently of nice interest in numerous metrological applications, whereas the latter is expressly supported for whispering gallery thermometry. The capability of the instrument to fulfill the performance needed for whispering gallery thermometry is initial verified using an extremely stable setup based on a QSR. Afterward, the calibration of the whispering gallery thermometer composed of the developed instrument and an existing resonator is performed. The obtained results prove the suitability of the instrument to replace vector network analyzers in correct resonance-primarily based experiments and additionally its capability to enable the employment of whispering gallery thermometers as transfer standards in the economic field.

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