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 interferom eter output by a dispersive grating in the Littrow configuration. Usin g a commercial low-cost laser diode source, the non-ambiguity measurin g range was measured to be 1.6 mm, whereas the maximum permissible wor king distance, including ambiguity was measured to be 1.2 cm. The line arity error and stability were measured to be 1.2 mu m and 32 nm, resp ectively.