Retro reflector for geodetic lasers with directional independent correction of speed aberration

摘要

A (cube) corner retroreflector for laser geodesy, intended to correct a velocity aberration delta , of the type including three reflecting facets (F1, F2, F3) substantially orthogonal to each other and defining three edges (z1, z2, z3) which are substantially orthogonal and which converge at a vertex (5), each edge being associated with that of the facets which is substantially orthogonal to it. Each facet has a shape which is at least approximately that of a cone portion (C1, C2, C3) whose axis coincides with the associated edge, the generatrices of this cone portion having a non-zero mean generatrix slope relative to a plane perpendicular to the axis of this cone portion; the three facets have their concavity turned in the same direction relative to all the said three facets. The mean alpha 0 of the 90 DEG deviations of the facets at least approximately satisfies the relationship alpha &tilde& 0.2. delta /n where k is a predetermined parameter depending on the number, the geometry and the refractive index or indices or the media constituting the volume of the said retroreflector. IMAGE