Radiography Correction for Pipe Weld Density Unevenness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing radiography techniques face challenges in generating correction data for radiographic images due to the time-consuming process of positioning the radiation source on the central axis of the pipe, leading to difficulties in obtaining correction information for density unevenness in weld inspection images.
Innovation Solution
A method and apparatus that acquire first image data from a portion of the object different from the inspected portion, bent along the object's outer shape, and generate correction data based on this information to correct second image data from the actual inspected portion, using a radiography system with a radiation detector and a correction unit to adjust pixel values according to the distance from the radiation source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If curve approximation is performed to generate the weld inspection density profile, then correction information can be obtained, but the process takes time and positioning the radiation source on the central axis is complex
Solution Approach 1:
The patent performs curve approximation on the reference fluoroscopic image obtained during the reference measurement phase to generate the reference density profile in advance. This preliminary processing allows correction information to be readily available when performing actual weld inspections, eliminating the need to perform time-consuming curve approximation and positioning during production inspections.
Solution Approach 2:
The patent creates a reference density profile that serves as a template or copy of the expected density distribution. This reference profile can be reused multiple times for correcting different weld inspection images without requiring repeated positioning and measurement processes, significantly reducing time loss while maintaining correction accuracy.
2Measurement precision
If the radiation source is disposed on the central axis of the pipe, then accurate reference measurement can be obtained, but the positioning process is time-consuming and complex
Solution Approach 1:
The patent performs the precise positioning of the radiation source on the central axis during the initial reference measurement phase. Once the reference density profile is generated from this precisely positioned measurement, the radiation source can be repositioned more flexibly for subsequent weld inspections without compromising correction accuracy, as the reference profile already captures the ideal central axis geometry.
Solution Approach 2:
The reference density profile acts as an intermediary that captures the geometric relationship between the central axis positioning and the detected image. Instead of requiring precise positioning for every measurement, the reference profile serves as a mediator that allows accurate correction even when the radiation source position varies during actual weld inspections.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables easy generation of correction data for radiographic images, effectively addressing density unevenness issues and improving the accuracy of defect detection in radiographic inspections.
Implementation Method 1
a radiation detector that detects radiation with which a portion to be inspected of an object to be inspected is irradiated and which is transmitted through the object to be inspected
Data Source
AI summary
A correction apparatus includes an acquisition unit that acquires first image data representing a radiographic image generated by the radiation detector which is irradiated with the radiation in a state of being provided on a portion of an object to be inspected different from a portion to be inspected so as to be bent along an outer shape of the object to be inspected, and a correction unit that generates correction data on the basis of the first image data and corrects second image data representing the radiographic image generated by the radiation detector which is irradiated with the radiation in a state of being provided on the portion to be inspected so as to be bent along the outer shape of the object to be inspected.