INTERFEROMETER ZUR LAGE- BZW. VERSCHIEBEWEGBESTIMMUNG EINES BEWEGLICHEN MESSSPIEGELS ODER DERGLEICHEN.

摘要

PCT No. PCT/AT91/00034 Sec. 371 Date Sep. 1, 1992 Sec. 102(e) Date Sep. 1, 1992 PCT Filed Feb. 28, 1991 PCT Pub. No. WO91/13317 PCT Pub. Date Sep. 5, 1991.As interferometer, especially for length measurement, with a laser light source (2) and a beam divider (7) to divide the laser light into a measuring and a reference beam which, after passing along geometrically separate paths, interfere in at least one recombination device (15), and with a photoelectric detector device (3) to evaluate the interference signals from the recombination device(s) (15). A flexible optical fibre (5) to guide the laser light is arranged between the laser light source (2) and the actual interferometer with the beam divider (7). In order to ensure the optical operation of the interferometer independently of external effects on the laser light-guide optical fibre, the interferometer has a polarising device (11) to establish a defined, preferably linear polarisation of the laser light at the input of the beam divider (7) which is advantageously arranged behind the flexible laser light-guide (5) and in front of the beam divider (7).