TDI Sensor Charge Speed Control for X-ray Inspection Focus
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Solution Overview
Problem
Conventional X-ray transmission inspection apparatuses experience image blur and erroneous detection due to variations in the vertical position of the sample, leading to over-detection of foreign matter.
Innovation Solution
An X-ray transmission inspection apparatus with a time delay integration sensor (TDI sensor) controlled by a distance sensor to adjust the charge transfer speed in real time, ensuring precise focus and preventing image blur, utilizing a laser distance sensor to measure variations in the sample's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a constant charge transfer speed is used in the TDI sensor, then the inspection process is simple, but image blur occurs when sample position varies
Solution Approach 1:
The patent applies the dynamics principle by making the charge transfer speed of the TDI sensor variable rather than constant. The control unit dynamically adjusts the charge transfer speed based on the actual distance between the X-ray source and sample, allowing the system to adapt to position variations and maintain image focus accuracy without complex mechanical adjustments.
Solution Approach 2:
The patent implements feedback by using the distance sensor to continuously monitor the position between the X-ray source and sample, then feeding this information back to the control unit which adjusts the charge transfer speed accordingly. This closed-loop feedback mechanism ensures that image quality is maintained despite variations in sample positioning.
2Manufacturing precision
If the charge transfer speed is adjusted in real time based on distance variations, then image focus accuracy is maintained, but the device complexity increases
Solution Approach 1:
The patent replaces mechanical adjustment mechanisms with an electronic control system. Instead of physically adjusting the TDI sensor or X-ray source position to maintain focus, the system uses electronic adjustment of the charge transfer speed based on distance measurements, significantly reducing mechanical complexity while maintaining precision.
Solution Approach 2:
The patent changes the operational parameter of the TDI sensor (charge transfer speed) in response to distance variations. By adjusting this electrical parameter rather than mechanical positions, the system maintains image focus accuracy with minimal increase in overall device complexity.
3Manufacturing precision
If a laser distance sensor is added to measure sample position, then image blur is prevented, but the device complexity increases
Solution Approach 1:
The distance sensor serves multiple functions: it measures the position of the sample, provides feedback for charge transfer speed adjustment, and enables the system to compensate for position variations. This multi-functionality justifies the addition of the sensor by providing multiple benefits from a single component.
Solution Approach 2:
The distance sensor acts as an intermediary between the physical position variation and the electronic control system. It converts physical distance information into electrical signals that the control unit can process, enabling precise adjustment of the charge transfer speed without direct mechanical intervention.
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 solution enables accurate detection of foreign matter by maintaining image focus and preventing over-detection, even with sample position variations, allowing for more detailed and precise data acquisition.
Implementation Method 1
utilizing a laser distance sensor to measure variations in the sample's position
Implementation Method 2
X-ray transmission inspection is used on the sample by means of an X-ray transmission image that is obtained by irradiating a sample with X-rays
Data Source
AI summary
Disclosed are an X-ray transmission inspection apparatus and an inspection method using the same that are capable of preventing over-detection and erroneous detection of foreign matter even when variations in vertical position of the sample occur. The X-ray transmission inspection apparatus includes: an X-ray source (2) irradiating a sample with X-rays; a sample moving device (3) moving the sample S continuously to a predetermined direction while X-rays X are emitted from the X-ray source; a time delay integration sensor (TDI sensor) (4) provided opposed to the X-ray source based on the sample, and detecting the X-rays transmitted through the sample; a distance sensor (5) measuring a distance between the X-ray source and the sample; and a TDI controller (6) controlling the TDI sensor by changing a charge transfer speed of the TDI sensor (4) in real time based on variations in the distance measured by the distance sensor.