Optics: measuring and testing – By configuration comparison – With object being compared and light beam moved relative to...
Patent
1996-05-22
1997-11-11
Pham, Hoa Q.
Optics: measuring and testing
By configuration comparison
With object being compared and light beam moved relative to...
356375, 33288, G01C 500
Patent
active
056869959
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a scale pattern arrangement of the kind having a position pattern and a calibration pattern which provides a time or length scale calibration.
BACKGROUND OF THE INVENTION
The measurements of a vehicle chassis are typically determined by means of methods in which a measuring unit, which is moveable along a measuring rail, is caused to direct a laser measuring beam onto measuring points specified on the vehicle chassis. The position of the unit along a vertical scale on the measuring rail is read-off against each chassis measuring point. This measurement value is fed into a memory and is subsequently processed in a computer, for instance a personal computer or a minicomputer having sufficient data processing capacity to make the calculations required. The measurement values are computer processed And presented as absolute values together with an indication of the extent to which these absolute values deviate from corresponding values obtained when measuring against a standard vehicle of the actual model concerned. Consequently, data related to different makes or models of cars are available for loading into the data system used or have already been stored in the fixed memories associated with the computer system.
U.S. Pat. No. 5,251,013 teaches a scale arrangement in which individually coded scales are positioned at different measuring points, such that each of the scales can be recognized or identified through its particular code. The patent specification also teaches scales which are so configured as to enable deviations in a height or vertical direction to be ascertained, although these scales are of a simple kind and are unable to provide a fine resolution of the height position. The scales taught by this prior patent specification are adapted for a measuring system which operates with a rotary measuring beam which rotates in one direction only.
SUMMARY OF THE INVENTION
The main object of the present invention is to provide a measurement scale which will provide a clear indication that a measurement signal actually derives from a sweep of the measuring beam over a measurement scale.
Another object of the invention is to provide a measurement scale which will enable measurements to be taken automatically in three dimensions with good resolution.
A further object of the invention is to provide a measurement scale which can be placed at different measuring points on a large object to be measured, for instance a car chassis, and which is not adapted individually to the measuring point on which it is attached.
Still another object of the invention is to provide a measurement scale which will provide a high degree of resolution of the height position measured or determined.
Yet another object of the invention is to provide a measurement scale which will indicate that it is partially obstructed, by the configuration of an obtained measuring beam in time. In this regard, the measuring arrangement can be readjusted to determine the measuring point on which the obstructed scale is located, therewith providing good penetration to different measuring points when measuring is effected from a measuring rail for instance, i.e. it shall be possible to reach all measuring points with a measuring beam transmitted from the rail.
At least the main object of the invention is achieved with a measurement scale having the characteristic features set forth hereafter. Further features and further developments of the invention are also set forth hereafter.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail with reference to the accompanying drawings, in which
FIG. 1 illustrates a measuring system including a carriage which moves along a measuring rail, and measurement scales against which measuring is effected; and
FIGS. 2-9 illustrate different exemplifying embodiments of an inventive measurement scale placed on a measuring point.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 illustrates a carriage 1 which is movable along a m
REFERENCES:
patent: 4492471 (1985-01-01), Wiklund
patent: 4997283 (1991-03-01), Danielson et al.
patent: 5251013 (1993-10-01), Danielson et al.
Dataliner AB
Pham Hoa Q.
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