X-ray detector cooling system with desiccant dehumidifier
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Solution Overview
Problem
Current semiconductor X-ray detectors face challenges in heat management, making it difficult to produce large-area detectors with a large number of pixels due to cumbersome cooling systems.
Innovation Solution
A cooling system comprising a chiller and a fan configured to control temperature and moisture levels, using a Peltier cooler and desiccant dehumidifier to prevent condensation and maintain a dry environment for the detector, which is not vacuum-encapsulated, allowing for effective heat dissipation and pixelated X-ray photon counting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If semiconductor X-ray detectors are used for direct conversion of X-ray into electric signals, then spatial resolution and absorption efficiency are improved, but heat management becomes cumbersome making large-area detectors difficult to produce
Solution Approach 1:
The detector is divided into a large number of small pixel elements (e.g., 1024x1024 pixels). Each pixel independently converts X-ray photons to electrical signals. This segmentation allows efficient heat dissipation across many small components rather than one large component, resolving the heat management issue while maintaining high spatial resolution through the fine pixel grid.
Solution Approach 2:
A Peltier cooler is introduced as an intermediary cooling system between the detector pixels and the environment. The Peltier cooler actively removes heat generated by the semiconductor pixels, enabling large-area detectors to operate without excessive heat accumulation. This intermediary cooling mechanism resolves the heat management complexity while allowing large detector areas to be produced.
2Measurement precision
If detector temperature is lowered to reduce electrical noise, then measurement precision is improved, but condensation of water vapor on the detector occurs
Solution Approach 1:
A desiccant dehumidifier is introduced as an intermediary device in the air path between the environment and the detector. The dehumidifier removes water vapor from the air before it contacts the cold detector surface, preventing condensation. This allows the detector to be cooled to low temperatures for reduced electrical noise while maintaining a dry environment that prevents harmful condensation.
Solution Approach 2:
The humidity parameter of the ambient air is actively controlled and changed by the desiccant dehumidifier. By reducing the water vapor content in the air, the dew point is lowered below the detector temperature, eliminating the condensation problem while allowing the detector to operate at low temperatures for optimal signal-to-noise ratio.
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 enables efficient temperature control and moisture management, reducing electrical noise and allowing for the production of large-area, high-pixel-count detectors with improved spatial resolution and absorption efficiency.
Implementation Method 1
A cooling system comprising a chiller and a fan configured to control temperature and moisture levels, using a Peltier cooler
Implementation Method 2
using a Peltier cooler and desiccant dehumidifier to prevent condensation
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
A system (200) suitable for X-ray detection comprises a detector (100) and a cooling system (210) configured to control temperature of the detector (100) and prevent condensation of water vapor on the detector (100). The detector (100) comprises an X-ray absorption layer (110) and an electronics layer (120). The X-ray absorption layer (110) comprises a plurality of pixels (150), each pixel (150) configured to count numbers of X-ray photons incident thereon whose energy falls in a plurality of bins, within a period of time. The electronics layer (120) comprises an electronic system (121) configured to add the numbers of X-ray photons for the bins of the same energy range counted by all the pixels (150). The cooling system (210) comprises a chiller (220) configured to lower temperature and moisture level of air, and a fan (213) configured to blow the air that is cooled and dried to the detector (100).