| 摘要 |
A method and apparatus for optically measuring coefficient of thermal expansion includes an optical dilatometer system. The system provides a housing having a chamber defined therein and a transparent end adapted for receiving a focused laser beam into the chamber. The housing is adapted for maintaining a vacuum in the chamber. The optical dilatometer system further provides an interferometer comprising first and second interference surfaces, the interferometer being positioned within the chamber. The system further provides a test sample positioned between the first and second interference surfaces. The method includes the step of transmitting a focused laser beam through the transparent end and to the interferometer, thereby generating an interference pattern defined by Newton rings. The Newton ring interference pattern is utilized to determine the coefficient of thermal expansion of the test sample.
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