X-ray Detector Positioning for Foreign Matter Detection
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Solution Overview
Problem
Conventional X-ray transmission inspection methods suffer from varying image clarity and contrast due to the distance of foreign matter from the detector, leading to overdetection or erroneous detection of foreign materials in lithium-ion secondary batteries.
Innovation Solution
An X-ray transmission inspection apparatus and method that maintains a constant distance between the inspection sample and the X-ray detector using a distance sensor and adjusting mechanism, ensuring consistent contrast and image reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional X-ray transmission method is used to detect foreign matter, then the detection process is simple, but the image contrast varies significantly depending on the distance between the foreign matter and the detector, leading to overdetection or erroneous detection
Solution Approach 1:
The patent implements a movable detector that can dynamically adjust its position along the X-ray transmission path. The detector is configured to move between a first position (closer to the sample) and a second position (farther from the sample), allowing the system to adapt to foreign matter at different depths within the sample. This dynamic positioning capability enables consistent image contrast regardless of the foreign matter's distance from the detector, resolving the technical contradiction between detection accuracy and system complexity.
2Measurement precision
If the detector is placed close to the sample to improve foreign matter image clarity, then the contrast for foreign matter near the detector improves, but foreign matter farther from the detector shows reduced contrast
Solution Approach 1:
The detector is designed with movable positioning capability along the X-ray transmission direction, enabling it to switch between multiple positions. When foreign matter is located deeper in the sample, the detector moves to a position closer to the sample to maintain image contrast. When foreign matter is closer to the detector, the detector moves to a farther position. This dynamic adaptation ensures consistent detection performance across all depth positions, resolving the contradiction between image contrast and detection coverage.
Solution Approach 2:
The system employs periodic or sequential detection at multiple detector positions. The detector alternates between the first position (for detecting foreign matter deeper in the sample) and the second position (for detecting foreign matter closer to the detector). This periodic action pattern ensures that foreign matter at any depth can be detected with optimal contrast, thereby achieving both high image quality and comprehensive detection coverage.
3Measurement precision
If multiple detectors are used to maintain consistent image contrast regardless of foreign matter position, then detection accuracy improves, but device complexity and cost increase
Solution Approach 1:
Instead of using multiple fixed detectors simultaneously, the patent employs a single detector with movable positioning capability. This detector can be relocated to different positions along the X-ray transmission path to optimize image contrast for foreign matter at various depths. This dynamic single-detector approach achieves the same effect as multiple fixed detectors but with reduced system complexity, cost, and maintenance requirements, thereby resolving the technical contradiction.
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
This approach stabilizes the detection of foreign matter size and material, preventing overdetection and erroneous detection, allowing for precise and rapid identification of foreign elements in lithium-ion secondary batteries.
Implementation Method 1
an X-ray tube that irradiates an inspection sample with an X-ray, an X-ray detector that receives a transmission X-ray corresponding to the X-ray having transmitted through the inspection sample to detect an intensity thereof
Data Source
AI summary
To prevent erroneous detection in detecting a foreign matter, which is caused by a change in distance between a sample and an X-ray detector, provided is an X-ray transmission inspection apparatus including an X-ray tube (11) that irradiates an inspection sample element with an X-ray, an X-ray detector (13) that detects a transmission X-ray when the X-ray is transmitted through a sample, an operation portion (17) that obtains a contrast image from a transmission image of a transmission X-ray, a sensor that calculates a distance between the sample and the detector, and a mechanism that adjusts the position of the X-ray detector, in which an X-ray transmission image is picked up while the distance between the sample and the X-ray detector is kept constant.