Method and apparatus for centering radiation source and detector on nondestructive testing of large-scale component

Abstract

The invention relates to the field of nuclear technology application, in particular to a method and the device completing centering and positioning under the condition that a radiation source is connected with a detector non-rigidly when large component nondestructive detection is carried out. The centering method of the invention used for the radiation source and the detector during the nondestructive detection of large components comprises the steps as follows: (a) the radiation source is roughly centered with the detector; (b) a centered shielding pattern is rotated to a shielding position; (c) the position of the shielding pattern is observed after the image forming; (d) the position from the radiation source to the shielding pattern is adjusted to a certain imaging error, thus completing the centering. The corresponding device of the invention comprises a centering positioning plate, the shielding pattern and a shielding collimator; wherein, the shielding pattern is arranged at the front end of the shielding collimator by the centering positioning plate. The method and the device of the invention realize the exact centering of the radiation source and the detector during the nondestructive detection application of large and super-large components, and can calculate the distance from the radiation source point to the detector, thus achieving the basic condition of the radiation image forming and completing the detection.

Description

Technical field

[0001] The invention relates to the application field of nuclear technology, in particular to a method and a device for completing the centering and positioning of the radiation source and the detector when the radiation source and the detector are not rigidly connected in the nondestructive testing of large components. Background technique

[0002] Radiographic non-destructive inspection technology has been widely used in many fields such as airport, railway, port safety inspection and industrial quality inspection; in non-destructive testing applications, the alignment of the radiation source and the detector is the basic condition for completing the inspection. In traditional nondestructive testing applications, either the radiation source and the detector are rigidly connected, or the detected object is small, the radiation source and the detector can be visually aligned. However, in the non-destructive testing of large components or extra-large structures, th...

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