Method of calibration for the measuring of objects by pairs of t

Details Method of calibration for the measuring of objects by pairs of t Method of calibration for the measuring of objects by pairs of t

1983-03-31

1985-04-16

Little, Willis

Geometrical instruments

Straight-line light ray type

Rod or target

33281, 33277, G01C 1502

Patent

active

045106959

ABSTRACT:
The invention contemplates a method of calibration (FIG. 1) for determining the distance (base length E.sub.b) between two angle-measuring instruments (theodolites 1, 2) used for triangulating measurement of coordinates of given points on larger objects.
For this purpose, a horizontal measurement bar (3) is fixedly set up between the measuring instruments (1, 2). The bar mounts at least three spaced target marks (4, 5, 6) in the form of balls which can be sighted from both sides, i.e., by both angle-measuring instruments (1, 2). The base length is calculated from the predetermined distance between the marks (4, 5, 6), and from difference in angles measured for each sighting.
Precise alignment of the bar (3) is not necessary, since inclination of the bar to the line connecting the theodolites can be calculated from the measured angles, for sightings made upon different pairs of marks (4/5 and 5/6, respectively).

REFERENCES:
patent: 2904890 (1959-09-01), Vajda

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