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.
2002
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11696/33133
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