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Method for measuring object

A technology for measuring objects and measuring values, applied in the direction of measuring devices, 2D image generation, using wave/particle radiation, etc., can solve the problems that are not considered and corrected

Inactive Publication Date: 2012-01-18
WERTH MESSTECHN
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  • Abstract
  • Description
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Problems solved by technology

[0005] However, the methods belonging to the prior art do not take into account the fact that not only the transmission length but also the geometry of the workpiece, especially in different rotational positions, cause different artifacts, for example due to different scattered radiation.
Furthermore, the correction by means of a unique characteristic curve of the projection data for all pixels of the detector does not take into account the fact that artifacts are also triggered by different characteristics of the individual pixels

Method used

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Embodiment Construction

[0175] exist figure 1 Neutral shows by way of example and in principle a CT measuring device which is to be part of a coordinate measuring system in order to measure a workpiece 4 . The device comprises an x-ray source 1 and an x-ray detector 5 with pixels, between which a workpiece or component 4 to be measured is arranged. Here, the x-ray radiation 2 leaving the x-ray source 1 penetrates the component 4 on different paths, wherein scattered radiation or other artifacts can form at the interface of the component 4 (and within the component 4 ), which other artifacts The shadows appear differently depending on the geometry of the radiation length present in the radiation direction.

[0176] In order to effectively correct artifacts that occur during CT measurements, it is now provided that different characteristic curves are used for correcting the measured values ​​of the individual pixels or groups of pixels of the CT detector used (ie x-ray detector 5 ). In this case, var...

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Abstract

The present invention relates to a method for correcting transmission image or projection data used for CT reconstruction, wherein when measured, a workpiece to be measured is arranged between an X-ray resource emitting X-ray radiation and an X-ray detector receiving the X-ray radiation. Furthermore, the invention also relates to a method for determining parameters of computer faultage radiography by using imaging an image with as possible as high quality and distinct difference on the detector according to the prepared transmission image. The invention also relates to an apparatus for determining the structure and / or geometry shape of objects by using measuring system, preferably computer faultage radiography measuring system, wherein the measuring system comprises at least one radiation resource, at least one radiation detector and at least one rotation shaft.

Description

technical field [0001] The invention relates to a method for determining the structure and / or geometry of an object or for measuring an object, such as a workpiece, by means of a measuring system, preferably a computed tomography measuring system, and for correcting when using a CT detector with pixels A method based on projection data for CT reconstruction. During the CT measurement of a workpiece, the workpiece is arranged on a rotational axis between an x-ray source emitting x-ray radiation and an x-ray detector receiving the x-ray radiation. The invention also relates to a device for determining the structure and / or geometry of an object by means of a measuring system, preferably a computed tomography measuring system, comprising at least one radiation source, at least one radiation detector and at least one rotational axis . Background technique [0002] The use of computed tomography for measurement purposes is only possible with high precision if the reconstructed t...

Claims

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Application Information

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IPC IPC(8): G06T5/00G06T11/00
CPCG01N23/046G06T11/005G01N2223/419G01N2223/33G01N2223/66G01B15/00G06T5/00
Inventor R.克里斯托弗I.施密特M.哈默T.韦登赫费尔
Owner WERTH MESSTECHN
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