Microscopic CT motion error correction method for rotating shaft

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 ...

AI Technical Summary

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

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