A 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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Foster et al. (1968) studied this question.
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