单词 | etalon |
释义 | etalon/ˈɛtəlɒn /noun Physics A device consisting of two reflecting glass plates, employed for measuring small differences in the wavelength of light using the interference it produces.The change in resonance frequency of the etalon measures the change in optical-path length....
OriginEarly 20th century: from French étalon, literally 'standard of measurement'. |
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