Data processing: measuring – calibrating – or testing – Measurement system – Dimensional determination
Patent
1996-11-20
1999-01-26
Shah, Kamini
Data processing: measuring, calibrating, or testing
Measurement system
Dimensional determination
356376, 356385, 356386, 250559, G01B 1124
Patent
active
058647783
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The invention relates to a device for measuring and calculating geometrical parameters or an object.
Such a device and such a process are known from EP 0 403 908. The known device comprises a basic body with a table on which a supporting apparatus for an object is displaceable. Above the table there is arranged a tripod structure which consists of three legs attached to the edge of the table, which are supplemented upwardly into a T-like portal. The three legs are mutually displaced by 90.degree.. Cameras are arranged or the legs which are movable on tracks in the vertical direction. A further stationary camera is situated in the centre of the T-like portal. The three cameras which are arranged on the legs as well as the camera which is arranged in the portal are directed towards the longitudinal central axis of the table. Illuminating devices are directly arranged on the respective cameras, which are directed towards the object to be measured.
The cameras are connected to an image Processing system. The profiles of the object to be measured are recorded simultaneously under several different angles of view. The measured profiles are compared with set profiles and displayed as curve diagrams or tables.
The cameras are exclusively arranged as incident light cameras, so that the supporting apparatus has to be moved for the measurement of various measuring points of the object in such a way that the measuring point is formed sharply in the cameras. The acquisition of the measured values is complicated and requires continuous control by the operating staff, because in the case of unfocused imaging the magnitude relationship of the reproduced points with the original would be erroneous and would lead to measuring errors.
The invention is thus based on the object or improving the aforementioned device in such a way that the measuring points can be accessed in a purposeful way, thus rendering the performance of the measurement simpler, faster and preciser.
This object is achieved in a device pursuant to the present invention.
In a first optical area measuring sensor, which is arranged as a transmitted light measuring sensor, the profile outline of the object to be measured is reproduced as a shadow image. As the image plane of the shadow of the profile outline is independent of the diameter of the object to be measured, the necessity concerning a separate adjustment of the distance between the object to be measured and the transmitted light measuring sensor for the focussing can be omitted. The imaging relationship of the shadow image of the object on the transmitted light measurement sensor is always constant, so that a determined measuring point on the outer profile of the object to be measured can be accessed by a second area measuring sensor arranged as an incident light measuring sensor in such a purposeful manner that this point is reproduced in the calibration plane and thus in the correct imaging scale on the incident light measuring sensor. A check concerning the sharpness by the operating staff is thus not required.
If the incident light measuring sensor id situated on a second slide which is jointly movable with the slide on which the transmitted light measuring sensor is arranged, then a selected measuring point can be accessed, for example, by driving the first slide with the transmitted light measuring sensor in such a way that it coincides with a marking which is identical with the calibration plane of the incident light measuring sensor. On reaching the point on the outer profile, the incident light measuring sensor is precisely situated in the position in which the same point is reproduced sharply. The imaging relationship of several points situated in the same plane is thus correct.
Preferably, the first slide is exclusively movable in one axial direction relative to the basic body and the supporting apparatus is arranged on a third slide which is movable relative to the basic body in the direction of the axis of rotation.
By limiting the degrees of freed
REFERENCES:
patent: 5278632 (1994-01-01), Shotwell
Article: 111 Werkstattstechnik. ZXeitschrift for Industriele Fertigung; vol. 73 (1983) Oct., No. 10 Wurzburg, Deutschland; Inventors: H.J. Warnecke and C. Keferstein; Title: Optoelektronische Koordinatenme.beta.Technik.
Patents abstracts of Japan, Inventor: Nishihara Sadamitsu; Title: Optical Measuring Machine; Publication No: JP63128213; Publication Date: May 31, 1988.
Morcom Christopher
Sachs Carsten
Wenke Oliver
Shah Kamini
Vialog Visuelle Automations Anlagen GmbH
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