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A long gauge in the form of a thick-walled tube is converted to a Fabry-Pérot cavity by attaching partial reflectors to its ends. The length of this gauge is determined from a number of absolute frequency measurements of the cavity resonances. A set of tunable, well-known CO 2 laser frequencies is used for lengths between 1 m and 10 m.
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Siemsen et al. (1996) studied this question.
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