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APPARATUS AND METHOD FOR THE DETERMINATION OF THE ABSOLUTE COEFFICIENT OF THERMAL EXPANSION IN ULTRALOW EXPANSION MATERIALS
APPARATUS AND METHOD FOR THE DETERMINATION OF THE ABSOLUTE COEFFICIENT OF THERMAL EXPANSION IN ULTRALOW EXPANSION MATERIALS
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机译:测定超低膨胀材料中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 determination of the absolute coefficient of thermal expansion of materials, including ultralow expansion materials, utilizes a metrology frame that is regulated within a first narrow temperature range that varies by only a small fraction of a degree Celsius from a set point temperature (e.g., less than about 0.01° C. from the set point temperature), while the temperature of the sample is varied to determine the coefficient of thermal expansion over a larger temperature range (e.g., 30, 40 or 50° C.). The method and apparatus permit determination of the coefficient of thermal expansion of a material to levels approaching 10−9/° C.
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