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Applied Optics

Applied Optics


  • Vol. 7, Iss. 5 — May. 1, 1968
  • pp: 825–831

Precision Thermal Expansion Measurements on Low Expansion Optical Materials

W. A. Plummer and H. E. Hagy  »View Author Affiliations

Applied Optics, Vol. 7, Issue 5, pp. 825-831 (1968)

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Recent critical applications for ultralow expansion materials have required thermal expansion measurements with very high precision and accuracy. A Fizeau interferometer employing a helium–neon laser has given a precision of ±0.1 × 10−6 cm/cm. A second, more rapid method consists of a rod type vitreous silica dilatometer. A stirred water bath is used for specimen temperature control and a high output, linear variable differential transformer serves as the extensometer. Precision of this method is ±0.5 × 10−6 cm/cm. Calibration procedures and results for several low expansion materials are discussed.

© 1968 Optical Society of America

Original Manuscript: November 13, 1967
Published: May 1, 1968

W. A. Plummer and H. E. Hagy, "Precision Thermal Expansion Measurements on Low Expansion Optical Materials," Appl. Opt. 7, 825-831 (1968)

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  1. J. B. Saunders, J. Res. Nat. Bur. Stand. 23, 179 (1939). [CrossRef]
  2. B. A. Lengyel, Lasers (John Wiley & Sons, Inc., New York, 1962), Sec. 17, pp. 91–99.
  3. K. D. Mielenz, R. B. Stephens, K. E. Gilliland, K. F. Nefflen, J. Opt. Soc. Amer. 56, 156 (1966). [CrossRef]
  4. ASTM Designation E228–66aT, “Tentative Method of Test for Linear Thermal Expansion of Rigid Solids with a Vitreous Silica Dilatometer,” ASTM Standards, Part 30, pp. 663–674, 1966.
  5. J. B. Austin, Physics 3, 240 (1932). [CrossRef]

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