Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1996-04-22
1997-07-08
Evans, F. L.
Optics: measuring and testing
By polarized light examination
With light attenuation
356375, 33707, 33503, G01B 1103, G01B 2104
Patent
active
056467320
ABSTRACT:
A coordinate measuring system (1) having a pickup head (8) which can travel on a carriage (6) on a guide unit (5) along a scale (7), and a scanner (3) for measuring a workpiece (12). The scanner (3) is mounted on a rotating body (2) which is arranged to be pivotable about an axis (4) on a carriage (6) which can travel along the guide unit (5). Pickup heads (8) on the rotating body (2) on both sides of the central axis (4) are associated with the scale (7) and are disposed at a distance from the scale (7) and the axis (4) such that, during the measurement, the rotating body (2) is displaced parallel to the scale, while for the rough positioning one coordinate is detected and evaluated as a measure lengthwise of the scale (7), and after the scanner (3) has been applied to the surface of the workpiece (12) the rotating body (2) pivots about its axis (4), and for the fine positioning a coordinate is detected and evaluated at right angles to the surface of the scale (7) as a measure of the distance of the pickup heads (8) from the scale (7). Thus in the coordinate measuring system of the invention, the precision of measurements can be increased by using a comparatively simple means to detect and evaluate a rotational movement of the scanner.
REFERENCES:
patent: 4587622 (1986-05-01), Herzog
patent: 5017013 (1991-05-01), Kellner
patent: 5131166 (1992-07-01), Weber
patent: 5134782 (1992-08-01), Breyer et al.
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