Abstract
Current progress in the INRiM experiment for the determination of the Boltzmann constant k B by means of acoustic thermometry is reported. Particularly, the microwave determination of the volume of a triaxial ellipsoidal resonator with an inner radius of 5 cm which was designed at LNE-CNAM is discussed. For the same cavity, acoustic measurements in helium at T w over the extended pressure range between 50 kPa and 1.4 MPa are reported and these results are compared with the predictions of a model which accounts for several perturbing effects. The procedures, methods, and results obtained in the calibration of several capsule-type SPRTs used in the experiment are briefly illustrated, together with the estimate of the temperature uniformity of the experiment.
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Gavioso, R.M., Benedetto, G., Madonna Ripa, D. et al. Progress in INRiM Experiment for the Determination of the Boltzmann Constant with a Quasi-spherical Resonator. Int J Thermophys 32, 1339–1354 (2011). https://doi.org/10.1007/s10765-011-1032-9
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DOI: https://doi.org/10.1007/s10765-011-1032-9