Laser interferometric dilatometer at low temperatures: application to fused silica SRM 739

An optical heterodyne interferometer has been combined with a helium flow cryostat to measure the linear thermal expansion coefficient of solids at cryogenic temperatures. The absolute accuracy in length measurement is within a few nanometres. Measurement results on a specimen of fused silica (SRM 7...

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Veröffentlicht in:	Cryogenics (Guildford) 1995-12, Vol.35 (12), p.887-891
Hauptverfasser:	Okaji, M., Yamada, N., Nara, K., Kato, H.
Format:	Artikel
Sprache:	eng
Schlagworte:	Condensed matter: structure, mechanical and thermal properties Exact sciences and technology fused silica Heat capacities of solids instrumentation Instruments, apparatus, components and techniques common to several branches of physics and astronomy interferometer Interferometers Optical instruments, equipment and techniques Physics standard reference material thermal expansion Thermal expansion thermomechanical effects and density Thermal properties of condensed matter Thermal properties of crystalline solids
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Beschreibung
Zusammenfassung:	An optical heterodyne interferometer has been combined with a helium flow cryostat to measure the linear thermal expansion coefficient of solids at cryogenic temperatures. The absolute accuracy in length measurement is within a few nanometres. Measurement results on a specimen of fused silica (SRM 739; by US NIST) in the temperature range 6–273 K are presented and compared with some literature data.
ISSN:	0011-2275 1879-2235
DOI:	10.1016/0011-2275(95)96887-R