Thermal expansion measurements using Fabry-Perot etalons

Thermal measuring and testing – Thermal testing of a nonthermal quantity – Expansion or contraction characteristics

Reexamination Certificate

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C374S043000, C374S045000

Reexamination Certificate

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06860633

ABSTRACT:
A method for determining the thermal expansion coefficient of a substance comprises, determining at each of two or more temperatures the absolute position of more than one resonant interference peaks of a Fabry-Perot etalon whose optical path is defined by said substance and calculating said coefficient from observed difference(s) in wavelength or frequency of said positions at said two or more temperatures.

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