Method and apparatus for 360° panorama inspection
Original Publication Date: 2004-Jun-04
Included in the Prior Art Database: 2004-Jun-04
360° inspection and measurement of the geometry of the inner surface of gasket rings
Method and apparatus for
panorama inspectionpanorama inspection
Inspection of the inner surface of gasket rings that consist of a metal hull and a rubber ring that is embedded in this hull (Fig. 1). Defects have to be detected and the gap between the ring and the metal hull has to be measured .
The inner surface (4) of the gasket (2) is inspected as follows: A cone-shaped mirror (12) is inserted from beneath into the gasket ring. A camera (6) is viewing the cone-shaped mirror (12) from above. Light (8) is coupled coaxially into the camera direction by a mirror (10) (Fig. 2). The cone-angle is 90°. By viewing from above and reflection at the cone surface it is possible to view the total inner surface (360°) of the gasket ring.
Fig. 1: Inspection setup
The panorama picture is shown in Fig. 2.
Fig. 2: Inspection setup and panorama picture
Measuring the geometry of the inner surface (gap) is performed by image processing algorithms with e.g. 4 measurement positions. The number of measuring positions can be increased as necessary. Additionally the concentricity of the fitted circles is calculated, which is a measure for the gaps between the rubber ring and the metal hull.