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Method of determining mass of objects from plurality of x-ray images taken at different energy level

An object, quality technique used in the field of radiographic inspection systems to solve problems such as lack of description

Active Publication Date: 2017-12-01
METTLER TOLEDO INC
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The quality of the sample is also mentioned as a property whose measurement can be improved by the dual energy scanning method, but how this is achieved is not described

Method used

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  • Method of determining mass of objects from plurality of x-ray images taken at different energy level
  • Method of determining mass of objects from plurality of x-ray images taken at different energy level
  • Method of determining mass of objects from plurality of x-ray images taken at different energy level

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Embodiment Construction

[0112] Figure 1A It is used to illustrate the problem to be solved by the present invention. As an experiment, a sample consisting of 1 liter of distilled water, thus having a known actual mass m a = 1 kg. In learning mode, as previously described, the quality correlating factor k is determined according to equation (4),

[0113]

[0114] Then, in the "weighing mode", the salt content of the sample is increased stepwise from 0% to 10%. In each step, using the value of the mass correlation factor k determined in the learning mode, the mass m of the sample is weighed on the scale and determined according to equation (3),

[0115]

[0116] Such as Figure 1A As shown, the mass value determined by X-ray scanning deviates from the actual mass by an error approximately linearly proportional to the salt content, ie, for each percentage increase in salt content, the error increases by about 0.9%. The observed linearity of the mass error as a function of salt content simply r...

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Abstract

A method of determining the mass of an object by scanning the object in a radiographic inspection system, specifically in an X-ray scanner with the capability to take scan images at a plural number J of energy levels, has three modes or parts, namely: an initial learning mode, a normal operating mode, and a learning improvement mode. An initial learning mode in which reference objects are scanned and their actual masses weighed and stored as reference values. A normal operating mode wherein sample objects with unknown mass m are scanned and analyzed for compatibility with the reference values, and if found incompatible, the method switches to the learning improvement mode. A learning improvement mode in which the actual mass of the sample object found incompatible is determined by weighing and updates the stored reference values.

Description

technical field [0001] The present invention relates to the field of radiographic inspection systems, such as scanner systems in which an item or material under inspection travels through an x-ray machine, or any system in which an x-ray image of a single object or bulk material is taken while moving or stationary Other radiographic equipment. Applications of such inspection systems include quality control inspections in the food and pharmaceutical industries, such as detecting the presence of foreign objects in packaged products, or also verifying specific compositions of products based on scanned images, such as the salt or fat content of sausages. As already known, the mass of an object can also be determined or at least estimated based on X-ray images, and the invention relates in particular to an improved method of determining or verifying the mass of an object from images obtained with a radiographic inspection system. Background technique [0002] This type of inspec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/087G01N23/04G01V5/12
CPCG01G9/005
Inventor N·哈特维希
Owner METTLER TOLEDO INC
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