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Apparatus and method for determining absolute thermal expansion coefficient of ultra low expansion material
Apparatus and method for determining absolute thermal expansion coefficient of ultra low expansion material
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机译：确定超低膨胀材料绝对热膨胀系数的装置和方法
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摘要
An improved method and apparatus for identifying the absolute coefficient of thermal expansion of a material, such as an ultra low expansion material, is only a slight degree Celsius from the set point temperature (e.g., less than about 0.01.degree. C. from the set point temperature) A measurement frame adjusted within a narrow first temperature range which varies only by the), while the temperature of the sample is thermally expanded over a larger temperature range (eg 30 ° C, 40 ° C, 50 ° C) It can be changed to identify the factor. The method and apparatus allow the identification of the coefficient of thermal expansion of the material at levels close to 10-9 / C.
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