Radiation Detector Sensor Overlap Thermal Expansion Fixing
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Solution Overview
Problem
The reproducibility of positions for imaging sensors in radiation detectors is compromised due to thermal expansion and contraction, especially when their end portions overlap, leading to potential deviations from their original positions.
Innovation Solution
A radiation detector design incorporating a support table with an arc surface shape and a spacer, along with fixing members that partially fix the imaging sensors and the support table, ensuring the sensors remain aligned and stable during thermal changes, and contact members that bias the sensors to maintain contact with the support table.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the end portions of two adjacent imaging sensors are arranged to overlap each other to improve coverage and reduce gaps, then the imaging coverage is improved, but the reproducibility of sensor positions deteriorates due to thermal expansion and contraction
Solution Approach 1:
A support table is introduced as an intermediary component between the imaging sensors and the fixing members. The support table provides a stable reference surface that mediates the thermal expansion effects, allowing the sensors to be fixed at overlapping end portions while maintaining position reproducibility through the intermediary support structure.
Solution Approach 2:
The patent addresses thermal expansion by changing the physical state or constraints of the sensor assembly. By fixing the sensors at overlapping end portions on a support table, the system changes the thermal response characteristics, allowing the sensors to expand or contract together while maintaining relative position reproducibility through the shared support structure.
2Stability of the object's composition
If the imaging sensors are fixed firmly to prevent position deviation during thermal changes, then the position stability is improved, but the sensor alignment and reproducibility deteriorate due to excessive constraint
Solution Approach 1:
The fixing members are designed to provide dynamic fixation that adapts to thermal changes. The fixing members constrain the sensors sufficiently to maintain position stability during thermal expansion or contraction, while allowing the sensors to return to their original positions when thermal stress is removed, thus maintaining position reproducibility.
Solution Approach 2:
The support table and fixing members are configured to cushion the effects of thermal expansion before position deviation occurs. The overlapping end portions and support table structure provide a cushioning mechanism that absorbs thermal stress while maintaining sensor alignment and reproducibility.
3Measurement precision
If the fixing members are positioned to maximize sensor coverage, then the imaging quality is improved, but the thermal expansion effects are amplified leading to position deviation
Solution Approach 1:
The fixing members are positioned at specific locations where the imaging regions of adjacent sensors overlap. This local quality approach concentrates the fixation at critical overlap zones rather than uniformly across the entire sensor surface, maximizing imaging quality while minimizing the impact of thermal expansion on overall position accuracy.
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 configuration enhances the reproducibility of the imaging sensors' positions, reducing the likelihood of deviations and improving the quality of radiographic images by maintaining sensor alignment and stability during thermal expansion and contraction.
Implementation Method 1
the thermal expansion or contraction of the two imaging sensors differs depending on how to fix the two imaging sensors and how to attach the imaging sensor unit to the support table
Implementation Method 2
the thermal expansion or contraction of the two imaging sensors differs depending on how to fix the two imaging sensors
Data Source
AI summary
A radiation detector includes a sensor panel unit, a support table to which the sensor panel unit is attached, and two fixing members. The sensor panel unit includes two sensor panels. The sensor panel has pixels that sense visible light converted from radiation and generate charge. The sensor panel unit has a configuration in which an end portion of one sensor panel and an end portion of the other sensor panel are arranged to overlap each other in a thickness direction. A first fixing member fixes two sensor panels in an overlap region in which the end portions overlap. A second fixing member fixes the sensor panel unit and the support table in the overlap region. The second fixing member at least partially overlaps the first fixing member in the overlap region in a plan view of the sensor panel unit in the thickness direction.