Method and system for measuring cavities and probe for use there

Details Method and system for measuring cavities and probe for use there Method and system for measuring cavities and probe for use there

1996-07-10

1999-08-03

Hantis, K P

Optics: measuring and testing

Inspection of flaws or impurities

Bore inspection

G01N 2100

Patent

active

059332310

ABSTRACT:
An optical method and system for measuring bore hole diameter, out-of-roundness and lobing and a probe for use therein are provided. A ring of structured light is initially formed or projected on the inner surface of a bore hole by optical components supported within a housing of the probe. A lens system also supported within the housing images the ring of light. Image merging lenses of the lens system reform the image at a video camera located at a window of the housing such that two or more arcs of the ring form a magnified image with the image of the arcs being shifted in space such that all the arcs can be viewed by the camera. The video camera image is captured by a frame grabber/computer. A computer calculates the location of the arcs and from this information determine bore diameter and other bore properties such as out-of-roundness and lobing. The method, system and probe have the ability to capture information around the entire bore without movement of the camera or any of the optical components supported within the housing.

REFERENCES:
patent: 3950096 (1976-04-01), Aeschlimann et al.
patent: 4493554 (1985-01-01), Pryoretal
patent: 4875777 (1989-10-01), Harding
patent: 4967092 (1990-10-01), Fraignier et al.
patent: 5543972 (1996-08-01), Kamewada
Harding et al "Optics, illumination and Image Sensing for Machine VisionIV," SPIE 11/-/10 /89.
Harding "Optics, Illumination and change Sensing for Machine Vision V111," SPIE 9/8-9/93.

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