| 摘要 |
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 X1, X2 and X3 and three Y-axis transducers Y1, Y2 and Y3 which, with the appropriate circuitry correct for pitch and yaw errors about the two axes. For the Z-axis only two transducers, Z1 and Z2, are required. The circuit means combines the various transducer outputs to derive corrected values of the three co-ordinates.
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