Nondestructive testing system and method for positioning chamber inner wall defect through positron probe

Abstract

The invention discloses a nondestructive testing system and method for positioning a chamber inner wall defect through a positron probe. The testing system comprises a hardware part and a software part. The hardware part comprises a base; a to-be-tested part front end support and a to-be-tested part rear end support which are located on the base and an air floatation guide rail module with a grating scale; a to-be-tested part; an annular detector support which is installed on the air floatation guide rail module with the grating scale; an annular detector array which is installed in the annular detector support; a positron probe source lead chamber which is located on the base; a positron probe liquid circulating input pipe and a positron probe liquid circulating output pipe which are connected between the positron probe source lead chamber and the to-be-tested part. The software part comprises a counting module of detectors for recording the number of gamma photons produced by positron annihilation; a maximum likelihood estimation mathematical model module for gamma photon equalization and compensation; a model solution module based on an ordered subset expectation maximum; an image enhancement module based on maximum interclass variance and a 3D image synthesis module.

Description

Technical field: [0001] The invention relates to a non-destructive testing system and a testing method for locating defects on the inner wall of a cavity by using a positron probe, belonging to the technical field of non-destructive testing. Background technique: [0002] Modern testing technology represented by non-destructive testing technology has become an important technical link in the high-end equipment manufacturing process. More mature non-destructive testing technologies include: ultrasonic and electromagnetic scanning technology, electron microscope imaging technology, computer tomography technology, noise detection technology etc., but the above-mentioned non-destructive testing technology is difficult to detect inner wall defects and cracks of metal alloys and single crystal parts with complex cavity structure and uneven wall thickness distribution, let alone accurate imaging and positioning of defects. At present, the detection of parts with complex inner cavit...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the deficiency of the existing non-destructive testing technology for the detection of parts with complex inner cavity structures, and provides a non-destructive testing system and a testing method for locating defects on the inner wall of the cavity through a positron probe. Localization of surface defects on the inner wall of single crystal material parts

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