Radiation Window Support Structure with Transition Region
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Solution Overview
Problem
Radiation windows face challenges in balancing transmission of desired radiation with mechanical robustness, as existing support structures often obscure radiation and can be prone to failure due to stress concentrations, especially when subjected to differential pressures and vibrations.
Innovation Solution
Incorporating a transition region in the support structure with a gradual change in rigidity between the flange and the transmissive area, allowing for increased fractional open area and use of more transmissive materials, such as polymers, to reduce stress concentrations and enhance mechanical strength without compromising radiation transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the window is made thinner to transmit radiation with less absorption, then radiation transmission is improved, but mechanical strength deteriorates
Solution Approach 1:
The support structure implements varying thickness throughout its geometry, with greater thickness at regions experiencing higher stress (such as near the flange and mounting areas) and reduced thickness in central regions where stress is lower. This localized variation in thickness provides mechanical strength where needed while minimizing radiation absorption in the overall structure, resolving the contradiction between thinness for transmission and thickness for strength.
2Strength
If a support structure is added to increase mechanical strength, then strength is improved, but radiation transmission deteriorates due to increased material obscuring the radiation path
Solution Approach 1:
The support structure employs a mesh or grid configuration with significant open area ratio, creating a porous-like structure that provides mechanical support while allowing radiation to pass through the openings. This approach maintains structural integrity and strength while minimizing the amount of material in the radiation path, thereby reducing radiation absorption and maintaining high transmission efficiency.
Solution Approach 2:
The support structure is designed as a three-dimensional mesh or grid with vertical thickness much smaller than its lateral dimensions, effectively moving the structural support function to a different dimensional scale. This thin-walled three-dimensional structure provides necessary mechanical strength through its geometric configuration rather than through material volume, minimizing interference with radiation transmission in the primary path.
3Ease of manufacture
If uniform thickness is used in the support structure, then manufacturing is simplified, but stress distribution deteriorates under differential pressure
Solution Approach 1:
The support structure implements varying thickness throughout its geometry, with greater thickness at regions experiencing higher stress (such as near the flange and mounting areas) and reduced thickness in central regions where stress is lower. This localized variation in thickness provides mechanical strength where needed while minimizing radiation absorption in the overall structure, resolving the contradiction between thinness for transmission and thickness for strength.
4Loss of energy
If fractional open area is increased to improve radiation transmission, then radiation transmission is improved, but mechanical strength deteriorates
Solution Approach 1:
The support structure is designed as a mesh or grid with significant open area ratio, creating a three-dimensional structure where vertical thickness is much smaller than lateral dimensions. This dimensional approach allows high fractional open area for radiation transmission while the three-dimensional geometry provides structural rigidity and strength through its configuration rather than material volume.
Solution Approach 2:
The support structure implements varying thickness throughout its geometry, with greater thickness at regions experiencing higher stress (such as near the flange and mounting areas) and reduced thickness in central regions where stress is lower. This localized variation in thickness provides mechanical strength where needed while minimizing radiation absorption in the overall structure, resolving the contradiction between thinness for transmission and thickness for strength.
Data Source
AI summary
An improved radiation window comprises a film permeable to radiation disposed on a support structure. The support structure comprises a primary transmissive area comprising a plurality of support members defining a plurality of apertures for radiation to pass through; a flange disposed around the periphery of the primary transmissive area having generally greater mechanical rigidity than the primary transmissive area; and a transition region disposed between, and contiguous with, the primary transmissive area and the flange; the transition region having generally greater mechanical rigidity than the primary transmissive area and generally lesser mechanical rigidity than the flange, thereby providing an intermediate rigidity transition between the dissimilar rigidities of the primary transmissive area and the flange. A radiation detection system comprises a sensor configured to detect radiation, disposed behind such an improved radiation window.