Method of non-destructively inspecting a curved wall portion

Details Method of non-destructively inspecting a curved wall portion Method of non-destructively inspecting a curved wall portion

1995-01-03

1996-06-04

Porta, David P.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378 58, G01N 2304

Patent

active

055240380

ABSTRACT:
A method of non-destructively inspecting a curved wall portion of a large and thick walled vessel for a defect by computed tomography is provided. A collimated source of radiation is placed adjacent one side of the wall portion and an array of detectors for the radiation is placed on the other side adjacent the source. The radiation from the source passing through the wall portion is then detected with the detectors over a limited angle, dependent upon the curvature of the wall of the vessel, to obtain a dataset. The source and array are then coordinately moved relative to the wall portion in steps and a further dataset is obtained at each step. The plurality of datasets obtained over the limited angle is then processed to produce a tomogram of the wall portion to determine the presence of a defect therein. In a preferred embodiment, the curved wall portion has a center of curvature so that the source and the array are positioned at each step along a respective arc curved about the center. If desired, the detector array and source can be reoriented relative to a new wall portion and an inspection of the new wall portion can be easily obtained. Further, the source and detector array can be indexed in a direction perpendicular to a plane including the limited angle in a plurality of steps so that by repeating the detecting and moving steps at each index step, a three dimensional image can be created of the wall portion.

REFERENCES:
patent: 4785354 (1988-11-01), Nakamura et al.
patent: 4845769 (1989-07-01), Burstein et al.
patent: 4907157 (1990-03-01), Uyama et al.

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