Surveying instrument with compensation for mechanical errors

Details Surveying instrument with compensation for mechanical errors Surveying instrument with compensation for mechanical errors

2004-06-23

2008-10-28

Bennett, G. Bradley (Department: 2841)

Geometrical instruments

Straight-line light ray type

Level

Reexamination Certificate

active

07441340

ABSTRACT:
The invention relates to a method of operating a surveying instrument (10) placed in a orthogonal XYZ-system at (0,0,0) having a movable unit (20), said instrument defining a sight line (128) that is controllably rotatable around a first axis (50), essentially horizontal, and around a second axis (90), essentially vertical, wherein said second axis (90) may be inaccurately positioned so that it deviates from a true vertical axis, and said first axis (50) may deviate from being orthogonal to the second axis (90); the method comprising the steps of determining at least one of the following group of errors relating to the instrument and/or its location: a) a trunnion axis error T as a function of the deviation from 90 degrees between the first axis (50) and the second axis; b) a horizontal collimation error CH, being the deviation between the sight line (128) and the perpendicular angle as related to the first axis (50); and c) a total plumb error defined by components, PI and PII, being two separate angular values defining the tilt of the instrument as related to the plumb line through the same; and d) using these determined values in continuously controlling the alignment when aiming the instrument. The invention also relates to a surveying instrument for use with the method and an error compensation system for a surveying instrument.

REFERENCES:
patent: 5475930 (1995-12-01), Kimura
patent: 5485266 (1996-01-01), Hirano et al.
patent: 5655307 (1997-08-01), Ogawa et al.
patent: 5689330 (1997-11-01), Gerard et al.
patent: 6688011 (2004-02-01), Gamal et al.
patent: 2003/0229997 (2003-12-01), Gamal et al.
patent: 2007/0089309 (2007-04-01), Kodaira

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