Important metrological applications in the field of primary thermometry and in the determination of the universal gas constant R from accurate measurements of speed of sound in spherical resonators have been demonstrated in recent years. A promising tool for the determination of the volume and the thermal expansion of a spherical cavity is the measurement of its microwave resonances in vacuum. This work reports results obtained at IEN in the characterization of a 1-liter spherical resonator. The thermal expansion of the resonator was determined in the range between 270 and 330 K. Deviations from ideal spherical shape were measured and tested by a comparison of non-radial acoustic modes and microwave multiplets.
Characterization of geometric imperfections and determination of the thermal expansion of a spherical acoustic resonator / Benedetto, G; Gavioso, Roberto; Spagnolo, R.. - In: REVISTA DE ACÚSTICA. - ISSN 0210-3680. - 33:(2002).
Characterization of geometric imperfections and determination of the thermal expansion of a spherical acoustic resonator
GAVIOSO, ROBERTO;
2002
Abstract
Important metrological applications in the field of primary thermometry and in the determination of the universal gas constant R from accurate measurements of speed of sound in spherical resonators have been demonstrated in recent years. A promising tool for the determination of the volume and the thermal expansion of a spherical cavity is the measurement of its microwave resonances in vacuum. This work reports results obtained at IEN in the characterization of a 1-liter spherical resonator. The thermal expansion of the resonator was determined in the range between 270 and 330 K. Deviations from ideal spherical shape were measured and tested by a comparison of non-radial acoustic modes and microwave multiplets.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
