A double-channel Michelson type interferometer is presented which allows absolute distance measurement up to 3 m with an uncertainty of 0.1 um. It used the principle of synthetic wavelength and can be used under vacuum or in any gaseous medium with the help of a new type of source called an air-wavelength standard. The CNES is interested in an absolute measurement both in space vacuum and on the ground, in air to characterize optical instruments.
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