Integrated Optical Blocking Filter for X-ray Detector
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional X-ray imagers require fragile and costly optical blocking filters to prevent visible light interference, which are challenging to integrate and reduce x-ray transmission performance, especially in space applications where mechanical support layers further complicate the issue.
Innovation Solution
An integrated optical blocking filter is directly deposited onto the x-ray detector surfaces, including the entrance-window, side, and back surfaces, using aluminum to block visible, ultraviolet, and near-infrared light, thereby enhancing durability and performance while minimizing light leaks through pinholes and substrate pathways.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional free-standing optical blocking filters are used, then visible light blocking is achieved, but the filters are fragile and require complex protective housings
Solution Approach 1:
The optical blocking filter is merged with the detector by directly depositing the filter material onto the detector surface. This integration eliminates the need for separate protective housings and mechanical support structures, as the filter becomes part of the detector assembly itself.
Solution Approach 2:
The mechanical support layer and protective housing system are replaced by direct deposition of the optical blocking material onto the detector. This substitution eliminates fragile mechanical structures and complex assembly requirements while maintaining filter functionality.
2Reliability
If conventional free-standing optical blocking filters with mechanical support layers are used, then filter stability is improved, but x-ray transmission is reduced
Solution Approach 1:
The mechanical support layer is extracted and removed from the filter structure. The optical blocking filter is applied directly to the detector surface without requiring a separate mechanical support substrate, thereby eliminating the 200-nm polymer layer that blocks x-rays while maintaining filter stability through direct adhesion.
3Object-affected harmful factors
If thicker optical blocking filters are used to block visible light, then light blocking performance is improved, but x-ray transmission is reduced
Solution Approach 1:
The filter material properties are optimized to achieve high visible light blocking performance with minimal thickness. By selecting appropriate materials and controlling deposition parameters, the filter achieves effective light blocking while maintaining thin profile to preserve x-ray transmission.
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 significantly reduces the weight and cost of X-ray imaging spectrometers, improves robustness, and enables miniaturization, allowing for more efficient and cost-effective X-ray imaging across various applications, including medical and astronomical uses without the need for protective housings.
Implementation Method 1
The optical-blocking filter blocks visible (400-700 nm), ultraviolet (10-400 nm), and near-infrared (700-1,500 nm) light
Implementation Method 2
The optical-blocking filter is deposited on and fully covers at least the entrance-window surface and the side surface of the x-ray detector, wherein the optical-blocking filter blocks visible (400-700 nm), ultraviolet (10-400 nm), and near-infrared (700-1,500 nm) light
Data Source
AI summary
An x-ray imaging device can include an x-ray detector and an optical-blocking filter. The x-ray detector has an entrance-window surface for receiving x-rays, at least one side surface, and a back surface facing in an opposite direction from the entrance-window surface. The optical-blocking filter is deposited on and fully covers at least the entrance-window surface and the side surface of the x-ray detector, wherein the optical-blocking filter blocks visible, ultraviolet, and near-infrared light.