Microscopic CT motion error correction method for rotating shaft

A technology of motion error and correction method, applied in measurement devices, instruments, scientific instruments, etc., can solve the problems of reducing three-dimensional spatial resolution and error of CT reconstruction results, etc.

Active Publication Date: 2014-04-30
TIANJIN UNIV
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Problems solved by technology

Therefore, the movement error of the rotation axis of the rotating sample stage of a few microns will undoubtedly lead to errors in the CT reconstruction results, thereby reducing its three-dimensional spatial resolution

Method used

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  • Microscopic CT motion error correction method for rotating shaft
  • Microscopic CT motion error correction method for rotating shaft
  • Microscopic CT motion error correction method for rotating shaft

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Embodiment Construction

[0032] The purpose of the present invention is to provide a method for correcting the movement error of the micro-CT rotating shaft so as to improve the three-dimensional spatial resolution of the micro-CT reconstruction results. The measurement method is simple, practical and reliable.

[0033] The present invention is achieved through the following technical solutions, a method for correcting the movement error of a micro-CT rotating shaft, which is characterized in that it includes the following steps:

[0034] (1) Install a capacitive sensor and a reference cylinder on the rotating sample stage in micro-CT to monitor the error movement of the rotating shaft;

[0035] (2) Calibrate the machining error and installation error of the reference cylinder in the sample stage with the function of measuring the rotation axis error motion;

[0036] (3) During the CT scanning process, the measurement values ​​of the three sensors S1S2S3 are collected while collecting each projection im...

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Abstract

The invention relates to the field of application of numerical control machining and measurement equipment in order to improve the three-dimensional space resolution of a microscopic CT reestablishment result, and a measurement method is simple, practical and reliable. Thus, according to the adopted technical scheme, a microscopic CT motion error correction method for a rotating shaft includes the following steps that first, displacement sensors and a reference cylinder are additionally arranged on a rotating sample platform in a microscopic CT so as to monitor the error motion of the rotating shaft; second, the machining error and the mounting error of the reference cylinder in the sample platform with the rotating shaft error motion measurement function can be calibrated; third, in the CT scanning process, measured values of three sensors are simultaneously collected when all projected images are collected; fourth, the position errors of all the projected images caused by the motion error of the rotating shaft are solved; fifth, the position errors of all the projected images are corrected and the projected images are reestablished three-dimensionally. The microscopic CT motion error correction method for the rotating shaft is mainly applied to the numerical control machining and measurement equipment.

Description

technical field [0001] The present invention relates to the application field of numerical control machining and measuring equipment. Specifically, the present invention relates to a method for correcting the movement error of a rotating shaft, in particular to a method for correcting the moving error of a rotating shaft in the process of micro-CT scanning. Background technique [0002] Traditional CT (Computed Tomography, computerized tomography) technology (including medical CT and industrial CT) can perform three-dimensional reconstruction of the internal structure of the measured object, and has already become an important technical means in the field of non-destructive testing, and its resolution is generally at the millimeter level. Micro-CT can achieve higher spatial resolution, and its emergence makes it possible to perform high-resolution three-dimensional imaging of the interior of the sample. Compared with traditional CT, micro-CT uses micro-focus ray sources (or ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B15/04G01N23/00
Inventor 胡晓东邹晶须颖赵耕砚陈津平胡小唐
Owner TIANJIN UNIV
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