Non-destructive testing system and testing method for locating cavity inner wall defects by positron probe
A technology of non-destructive testing and detection methods, applied in the direction of measuring devices, material analysis using wave/particle radiation, instruments, etc., to achieve the effect of improving resolution
Active Publication Date: 2018-01-02
深圳航宇光子检测技术有限公司
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[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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[0031] The non-destructive testing system for locating the inner wall defect of the cavity by the positron probe of the present invention can accurately locate the structural defect of the complex inner cavity of the part in three dimensions. The objects measured by the non-destructive testing system of the present invention are as follows: 1. The inner cavity of the "beer bottle-shaped" parts with liquid storage space, such as piston cylinders, valve body accumulators, etc.; 2. The inner wall of the stepped pipeline structure, For example, integrated valve pipeline, servo electro-hydraulic control valve pipeline and flow diversion on the inner wall of capillary, etc.; 3. Closed parts assembly with fixed liquid input and output ports, such as internal combustion engine fuel circuit, gearbox hydraulic torque converter system, aviation turbine engine combustion circuit, aviation hydraulic system electro-hydraulic servo integrated unit, etc.
[0032] In the present invention, the n...
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The invention discloses a non-destructive testing system and a testing method for locating defects on the inner wall of a cavity by using a positron probe. The testing system includes a hardware part and a software part. Rear end bracket and air bearing guide rail module with grating scale; parts to be tested; ring detector bracket installed on the air bearing guide rail module with grating scale; ring detector array installed in the ring detector bracket; The positron probe source lead chamber on the base; the positron probe liquid circulation input pipe and the positron probe liquid circulation output pipe connected between the positron probe source lead chamber and the part to be tested. The software part includes a counting module for detectors to record the number of gamma photons produced by positron annihilation; a mathematical model module for maximum likelihood estimation of gamma photon equal share compensation; a model solving module based on the maximum expectation of ordered subsets; a module based on the maximum inter-class variance Image enhancement module and 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...
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IPC IPC(8): G01N23/00
Inventor 刘兼唐肖辉赵敏姚敏陈皓
Owner 深圳航宇光子检测技术有限公司