Geometrical instruments – Miscellaneous – Light direction
Patent
1983-08-19
1985-06-18
Martin, Jr., William D.
Geometrical instruments
Miscellaneous
Light direction
33549, 33189, 33503, G01B 1103
Patent
active
045233802
ABSTRACT:
Measuring apparatus for determining the position of a point in a measuring volume relative to a datum point at which three mutually perpendicular axes intersect, includes a probe member supported for movement within that volume. Errors due to rotations about the various axes are corrected by providing additional transducers on each axis, there being (n+1) transducers where n is the number of rotations for which correction is required. The embodiments described have three X-axis transducers X.sub.1, X.sub.2 and X.sub.3 and three Y-axis transducers Y.sub.1, Y.sub.2 and Y.sub.3 which, with the appropriate circuitry correct for pitch and yaw errors about the two axes. For the Z-axis only two transducers, Z.sub.1 and Z.sub.2, are required. The circuit means combines the various transducer outputs to derive corrected values of the three co-ordinates.
REFERENCES:
patent: 3749501 (1973-07-01), Wieg
patent: 4230011 (1980-10-01), Battaglia
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