Patent ID: 9310183
Filing Date: 2016-04-12
CPC Classification: G01B

Claim Text:
1. A measuring device for high-precision optical determination of distance and/or position, comprising: a light source; at least one optical functional element arranged as a plane mirror; two imaging elements; and a detector system; wherein the optical functional element is adapted such that at least one of at least two sub-beams impinges on the optical functional element three times before the sub-beams propagate, interferingly superposed, in a direction of the detector system, the detector system adapted to generate at least one phase-encoded measuring signal from the superposed sub-beams; wherein between the impingements on the optical functional element, the sub-beam passes through the imaging elements, the imaging elements having imaging factors such that no location and directional shear of the interfering sub-beams results if the optical functional element tilts out of a setpoint position; wherein the imaging elements are adapted to displace emergent sub-beams relative to incident beams of rays; wherein for the imaging factors of a number of N imaging elements, the following conditions are satisfied: wherein n=1 . . . N and m