An Error Compensation Method Applicable to the Swing Angle of the Rotation Axis of the Neutron Tomography System

A technology of neutron tomography and axis of rotation, applied in image analysis, image data processing, 3D modeling, etc. Reliability and other issues, to achieve consistent clarity, reduce manufacturing and installation accuracy requirements, and ensure the effect of uniqueness

Inactive Publication Date: 2017-10-13
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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Problems solved by technology

If the calculation is still performed according to a constant during image reconstruction, it will result in Y d The uneven distribution of the resolution of the reconstructed faults in the axial direction affects the accuracy of the 3D reconstruction model and the reliability of feature information measurement

Method used

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  • An Error Compensation Method Applicable to the Swing Angle of the Rotation Axis of the Neutron Tomography System
  • An Error Compensation Method Applicable to the Swing Angle of the Rotation Axis of the Neutron Tomography System
  • An Error Compensation Method Applicable to the Swing Angle of the Rotation Axis of the Neutron Tomography System

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Experimental program
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Embodiment example

[0124] The parameters of the scanning device used in the experiment are as follows:

[0125] (1) Neutron source: cold neutron source

[0126] (2) Area array detector: the imaging size is 2048×2048, and the pixel size is 0.2mm.

[0127] Experimental steps:

[0128] (1) Place a tested sample on the scanning platform, start the scanning platform to rotate to drive the tested sample to rotate 360° step by step, with a step angle of 0.5°, and collect 720 projection images in total. Ostu threshold segmentation is performed on all projection images to obtain 720 segmented projection images; then all the segmentation projection images are superimposed into a two-dimensional matrix, which is the composite projection image P ave ,like Figure 4 shown.

[0129] (2) According to the step of obtaining gradient angle and gradient angle histogram in the method of the present invention, obtain the synthetic projection image P ave The gradient angles of all pixels, and the histogram F(β) ...

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Abstract

The invention discloses an error compensation method for neutron tomography rotation axis deflection angle. The method is based on the projection geometric symmetry principle of parallel beam neutron rays, and obtains by superimposing projection data within a 360-degree rotation range of a sample. A composite projected image with a unique symmetry axis, the symmetry axis of the composite projected image is the projection line of the sample rotation axis; the histogram of the pixel value gradient angle of the composite projected image is further calculated, and the histogram distribution is an even function. Find the symmetry center of the even function, and the gradient angle corresponding to the symmetry center position is the yaw angle of the rotation axis. By introducing the measured yaw angle as a correction parameter into the reconstruction algorithm, the error compensation for the yaw angle of the rotation axis can be realized, so as to ensure the consistency of the definition of each reconstructed slice of the sample and effectively improve the reconstruction accuracy.

Description

technical field [0001] The invention relates to an error compensation method for the deflection angle of the rotation axis of neutron tomography imaging, which can be used for non-destructive testing and industrial computer tomography in the field of neutron photography. Background technique [0002] Neutron radiography has advantages over X-rays in the detection of hydrogen-containing materials, heavy metal component structures, different elements with similar atomic numbers, and radioactive materials. Therefore, it has important applications in military, aviation, aerospace, archaeology and other fields. As an important branch of neutron radiography, neutron CT (Computed Tomography, computerized tomography) has also received increasing attention and rapid development, and has played an important role in detecting the internal structure and quality status of samples. [0003] figure 1 It is a tomographic scanning principle diagram of a traditional neutron tomography system...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T17/00G06T7/136
Inventor 唐彬霍合勇吴洋孙勇尹伟王胜李航曹超刘斌朱世雷张旸
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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