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Method for measuring uncertainty of industrial CT geometric dimension based on spherical die body

A technology for measuring uncertainty and geometric dimensions, applied to measuring devices, instruments, and using wave/particle radiation, etc., can solve problems that have not been unanimously recognized, and achieve the effect of improving measurement accuracy and reducing impact

Pending Publication Date: 2020-04-24
INST OF APPLIED ELECTRONICS CHINA ACAD OF ENG PHYSICS
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  • Abstract
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  • Application Information

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Problems solved by technology

However, at present, there is no unanimously recognized method for the evaluation of the uncertainty of industrial CT size measurement.

Method used

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  • Method for measuring uncertainty of industrial CT geometric dimension based on spherical die body
  • Method for measuring uncertainty of industrial CT geometric dimension based on spherical die body
  • Method for measuring uncertainty of industrial CT geometric dimension based on spherical die body

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Effect test

Embodiment 1

[0030] A method for measuring uncertainty of industrial CT geometric dimensions based on a spherical phantom, comprising the following steps:

[0031] S1: The ball model is sent to the metrology department for calibration and inspection before use and is used as the workpiece to be inspected, and a calibration certificate is obtained. , zirconium dioxide or stainless steel.

[0032] S2: Use industrial CT to scan and reconstruct the inspected workpiece multiple times, and the number of scans is not less than 5 times.

[0033] A complete industrial CT measurement process includes the following steps: First, the scanning and reconstruction of the sample, X-ray transillumination of the sample, affected by the difference in the structure and composition of the sample, resulting in different degrees of attenuation of X-rays, forming a group on the detector. Bright and dark projection related to the sample structure; the turntable rotates synchronously to collect a large number of 2...

Embodiment 2

[0045] The same parts of this embodiment and the first embodiment will not be repeated, and the differences are:

[0046] A ball model composed of two silicon nitride ceramic balls with grade G10 was selected as the research object to evaluate the uncertainty of industrial CT measurement. The advantages of choosing the silicon nitride ceramic ball group model are: high precision, high strength, high hardness, low cost, easy calibration, easy fitting and measurement, small thermal expansion coefficient, small linear attenuation coefficient, ball center distance resistance to threshold fluctuations, etc. The selected ball model (that is, the workpiece to be inspected) has passed the metrological verification of the measuring institution before the industrial CT measurement. The calibration certificate shows that the diameter of the ceramic ball is 19.05mm, the distance between the center of the ball is 38.10mm, the G10 level, the calibration test condition: temperature : 20.3°C,...

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Abstract

The invention relates to a method for measuring uncertainty of an industrial CT geometric dimension based on a spherical die body, and belongs to the technical field of industrial CT dimension measurement. The method comprises the following steps: selecting a ball model as a detected workpiece and carrying out calibration detection to obtain a calibration certificate; performing industrial CT scanning reconstruction on the detected workpiece; completing geometric dimension measurement of the ball model; and calculating standard uncertainty of geometric dimension measurement; and calculating expansion uncertainty. The method is based on the calibrated ball model, and evaluation steps and a mathematical model for industrial CT measurement uncertainty of a specific task are preliminarily established by adopting an experimental evaluation method; the system analyzes the influence of a calibration process, a measurement process, a detected workpiece, a system error and the like on the uncertainty of the measurement result and the maximum measurement uncertainty contribution mainly comes from the system error of the industrial CT equipment, and the influence of the uncertainty componentcan be greatly reduced by performing system calibration on the industrial CT equipment before measurement and thus the measurement accuracy is improved.

Description

technical field [0001] The invention belongs to the technical field of industrial CT dimension measurement, in particular to a method for measuring uncertainty of industrial CT geometric dimensions based on a spherical phantom. Background technique [0002] With the development of industrial manufacturing level, the structure of industrial products has become more and more complex, the requirements for the precision of manufacturing technology are higher and higher, and the requirements for product quality control and quality assurance are also higher and higher. Therefore, new technologies are constantly emerging to meet user requirements. Since the birth of CT technology, it was first used in medical diagnosis and non-destructive testing. With the advancement of CT technology and the improvement of measurement accuracy, its application range has gradually expanded to the field of industrial product measurement and has emerged. In the field of industrial measurement, CT te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B15/00
CPCG01B15/00
Inventor 李敬李寿涛陈思刘清华陈云斌
Owner INST OF APPLIED ELECTRONICS CHINA ACAD OF ENG PHYSICS
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