X-ray Inspection Device Sensor Displacement Correction
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Solution Overview
Problem
Existing X-ray inspection devices with two line sensors face reduced inspection precision due to potential displacement of the mounting positions of the sensors, which can occur during assembly, leading to inaccurate differential images and reduced inspection reliability.
Innovation Solution
An X-ray inspection device equipped with a conveying means, an X-ray source, a first line sensor, a second line sensor, a detection unit, and a corrected-image generation unit, where the detection unit detects positional displacement of the second line sensor relative to the first line sensor in horizontal and vertical directions, and the corrected-image generation unit generates corrected X-ray images to maintain accurate inspection results despite sensor displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If strict control of the assembly process is implemented to minimize displacement of line sensors, then manufacturing precision is improved, but productivity is reduced due to increased assembly time
Solution Approach 1:
The patent performs preliminary actions by detecting the actual mounting positions of both line sensors before image acquisition, calculating the displacement between actual and predetermined positions, and generating correction data in advance. This allows the system to compensate for positioning errors without requiring strict assembly control, thereby maintaining image alignment accuracy while reducing assembly time and improving productivity.
2Productivity
If the mounting positions of line sensors are not precisely controlled, then productivity is improved, but measurement precision deteriorates due to inaccurate differential images
Solution Approach 1:
The patent implements a feedback mechanism by detecting the actual mounting positions of the line sensors, comparing them with predetermined positions to calculate displacement, and using this feedback information to generate correction data. This correction data is then applied to align images from both sensors, ensuring accurate differential image generation and maintaining high inspection precision even when assembly precision is relaxed, thereby improving productivity.
3Measurement precision
If correction processing is applied to compensate for sensor displacement, then inspection precision is maintained, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical positioning systems with computational methods. Instead of using precision mechanical assemblies to ensure exact sensor positioning, the system uses detection units to measure actual positions, calculates displacements, and applies correction data through image processing algorithms. This substitution of mechanical precision with computational correction simplifies the physical device while maintaining or improving inspection precision.
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
The solution ensures highly reliable and accurate inspection results by correcting X-ray images based on detected sensor displacement, thereby maintaining inspection precision even when the mounting positions of the line sensors are not perfectly aligned.
Implementation Method 1
a first line sensor configured to detect X-rays that have passed through the article in a first energy band
Implementation Method 2
a second line sensor configured to detect X-rays that have passed through the article in a second energy band which is different from the first energy band
Data Source
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AI summary
Provided is a highly reliable X-ray inspection device having two line sensors, in which accurate inspection results can be obtained even when there is displacement of the mounting position of the line sensors. The X-ray inspection device (10) is provided with a conveyor unit for conveying an article, an X-ray emitter (13), a first line sensor (14), a second line sensor (15), a detection unit (22ca), and a corrected-image generation unit (22d). The X-ray emitter emits X-rays to the article conveyed by the conveyor unit. The first line sensor detects, in a low energy band, X-rays that have passed through the article. The second line sensor detects, in a high energy band, X-rays that have passed through the article. The detection unit detects positional displacement of the second line sensor with respect to the first line sensor in horizontal direction and vertical direction. The corrected-image generation unit generates, based on the detection result of the detection unit, a corrected second X-ray image by correcting a second X-ray image of the article obtained based on the detection results of the second line sensor.