Target object used for retroreflexion of optical radiation

Details Target object used for retroreflexion of optical radiation Target object used for retroreflexion of optical radiation

2007-09-27

2010-10-26

Fulton, Christopher W (Department: 2841)

Geometrical instruments

Straight-line light ray type

Rod or target

Reexamination Certificate

active

07818889

ABSTRACT:
A target object (1a) used for retroflexion of optical radiation comprises at least six triple prisms (p1, p2), combined to give a 360 degree reflector which can be arranged on a geodetic measuring pole (6). The triple prisms (p1, p2) forming the 360 degree reflector are arranged in such a manner as to leave a clearance in the center of the 360 degree reflector for accommodating a section (6a) of the measuring pole (6). The prisms are also arranged in such a manner that the virtual images of the triple prism tips lie substantially in one plane perpendicular to a reference axis (10) that runs through the center of the 360 degree reflector and in parallel to the longitudinal direction of the measuring pole (6).

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Nobuo Sugimoto et al, “Retroflector with acute dihedral angles” Optics Letters, OSA, Optical Society of America, Washington DC, US vo. 19, No. 20, Oct. 15, 1994, pp. 1660-1662.

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