Absolute distance measurement using comb-spectrum interferometry

A measurement technique is proposed based on dispersive interferometry using a comb-spectrum source: dispersive comb-spectrum interferometry (DCSI). The configuration proposed processes the Michelson interferometer output by a dispersive grating in the Littrow configuration. Using a commercial low-cost laser diode source, the non-ambiguity measuring range was measured to be 1.6 mm, whereas the maximum permissible working distance, including ambiguity was measured to be 1.2 cm. The linearity error and stability were measured to be and 32 nm, respectively. La methode de mesure qu'on propose se fonde sur l'interferometrie a dispersion avec un spectre a peigne: dispersive comb-spectrum interferometry (DCSI). La configurasion optique traite la lumiere qui sort d'un interferometre de Michelson en employant un reticule a dispersion dans la configuration de Littrow. En utilisant une diode laser commerciale l'interval de mesure sans ambiguite est 1.6 mm, tandis que la distance maximal de functionament en includant l'ambiguite est 1.2 cm. On a verifie que les erreurs de linearite et de stabilite sont et 32 nm.