Patent ID: 8570529
Filing Date: 2013-10-29
Classification: G01B

Abstract:
1. A positioner, comprising: a first fixed-position part; a second movable part that is configured to be displaced relative to the first fixed-position part; a position adjusting device, acting between the first fixed-position part and the second movable part, to displace the second movable part relative to the first fixed-position part, the position adjusting device comprising a slip-stick drive and being configured to displace the second movable part relative to the first fixed-position part over a path length of at least several millimeters; and a Fabry-Perot interferometer, wherein an interferometer head of the Fabry-Perot interferometer is mounted on the first fixed-position part and light emitted from the interferometer head is reflected back to the interferometer head from the second movable part, and wherein a finesse of the Fabry-Perot interferometer is less than 10.0, particular less than 5.0, more particular less than 1.0 or still more particular less than 0.5.