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Chinese Optics Letters

Chinese Optics Letters


  • Vol. 6, Iss. 9 — Sep. 1, 2008
  • pp: 669–672

Measurement of thermal expansion coefficient of nonuniform temperature specimen

Jingmin Dai, Chunsuo Xin, and Xiaowa He  »View Author Affiliations

Chinese Optics Letters, Vol. 6, Issue 9, pp. 669-672 (2008)

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A new technique is developed to measure the longitudinal thermal expansion coefficient of C/C composite material at high temperature. The measuring principle and components of the apparatus are described in detail. The calculation method is derived from the temperature dependence of the thermal expansion coefficient. The apparatus mainly consists of a high temperature environmental chamber, a power circuit of heating, two high-speed pyrometers, and a laser scanning system. A long solid specimen is resistively heated to a steady high-temperature state by a steady electrical current. The temperature profile of the specimen surface is not uniform because of the thermal conduction and radiation. The temperature profile and the total expansion are measured with a high-speed scanning pyrometer and a laser slit scanning measuring system, respectively. The thermal expansion coefficient in a wide temperature range (1000-3800 K) of the specimen can therefore be obtained. The perfect consistency between the present and previous results justifies the validity of this technique.

© 2008 Chinese Optics Letters

OCIS Codes
(000.6850) General : Thermodynamics
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.4570) Instrumentation, measurement, and metrology : Optical design of instruments
(120.6780) Instrumentation, measurement, and metrology : Temperature

Jingmin Dai, Chunsuo Xin, and Xiaowa He, "Measurement of thermal expansion coefficient of nonuniform temperature specimen," Chin. Opt. Lett. 6, 669-672 (2008)

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