| 摘要 |
The present invention relates to an interferometric path and/or rotation measuring device having a transducer unit (14), which has grating means, and which cooperates with a light conductor unit and a light pickup unit to detect a linear and/or rotational movement of the grating means in such a way that two partial beams (20, 22) of the light conductor unit which are aimed at the grating means, generate a superposition signal which is detectable by the light pickup unit and is a function of the linear or rotational movement and/or a position of the grating means, a modulation interferometer unit (10) being connected upstream from the light conductor unit, the modulation interferometer unit (10) having means for beam splitting into the two partial beams (20, 22) and first means for optical delay of one of the two partial beams (20, 22), which cause an optical delay route longer than an optical coherence length of the two partial beams (20, 22), the modulation interferometer unit (10) being connected via a fiber-optic light conductor (12), to which the two partial beams (20, 22) are applied jointly, to the transducer unit (14), and the light pickup unit being provided on the transducer unit (14). |
