(a) Top cap of the cavity supporting the spherical sapphire and antennas; (b) polished gold-plated bottom cap, cavity body with o-ring seals, and vacuum line.
(a) 3D graph and (b) 2D equatorial cross section of the electric energy density for the WGM near to 13.5 GHz (m = 3).
Relative fitting residuals found in the estimation of the real and imaginary part of center frequency peak f 0 for the WGM1 mode.
Cubic fitting residuals, as converted in temperature unit, for the WGM thermometer calibration between −40 °C and 85 °C.
Quartic fitting residuals, as converted in temperature unit, for the WGM thermometer calibration between −40 °C and 85 °C.
Fractional changes of center frequency f 0 with temperature (WGM thermometer sensitivity) for mode WGM1.
Ice melting point repeatability of the WGM thermometer over three days of measurement.
Short-term temperature stability at the ice melting point.
Comparison of the response to temperature steps of the WGM thermometer and the PRT.
WGM frequency and Q calculated for the INRIM WGM resonator thermometer at three azimuthal mode numbers.
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