Method for Measuring Small Thermal Expansion with a Single Frequency Helium-Neon Laser
1968; American Institute of Physics; Volume: 39; Issue: 5 Linguagem: Inglês
10.1063/1.1683467
ISSN1527-2400
Autores Tópico(s)Chemical Thermodynamics and Molecular Structure
ResumoA method for measuring extremely small coefficients of expansion (10−8 to 10−6/C°) is described. The swept frequency output characteristics of a single frequency helium-neon laser are used to attain high resolution with an easily constructed interferometer. A technique for specimen design and the advantages of using a confocal interferometer configuration are described. Experimental thermal expansion coefficient measurements for commercial Invar and special high purity, low expansion Invar are presented.
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