Multiple Screen Detection System for Non-Metallic Object Imaging
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Solution Overview
Problem
Conventional radiant energy imaging systems for security screening face limitations in detecting non-metallic objects like plastics, ceramics, and explosives due to low atomic number materials, which are difficult to distinguish from the body's background, and require high radiation levels for adequate image quality, leading to unacceptably poor image quality and radiation exposure concerns.
Innovation Solution
A detection system employing multiple screens with scintillator materials like calcium tungstate and photomultiplier tubes within an enclosure to enhance the absorption and conversion of electromagnetic radiation into light, increasing detection efficiency and reducing radiation exposure by maximizing the interaction of X-ray photons with the detector material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional single-screen detection systems are used, then device complexity is low, but detection efficiency and image quality are insufficient for non-metallic objects
Solution Approach 1:
The detection system is divided into multiple independent screens (first screen, second screen, third screen) positioned at different locations within the enclosure. Each screen detects radiation from different angles or depths, segmenting the detection task to improve overall detection efficiency and image quality for non-metallic objects.
Solution Approach 2:
The patent introduces a temporal dimension to the detection process by using multiple screens that operate at different time points during the radiation exposure cycle. This multi-temporal detection approach captures radiation interactions at various stages, enhancing the ability to distinguish non-metallic objects from background.
2Measurement precision
If high radiation levels are used to improve image quality, then detection capability improves, but radiation exposure to persons increases
Solution Approach 1:
The multiple screens continuously detect radiation throughout the exposure period, maximizing the utilization of available radiation photons. This continuous detection approach improves image quality by accumulating signal information over time without requiring increased radiation dosage.
Solution Approach 2:
The system uses the radiation scattered or transmitted by the person's own body as the detection signal. By positioning multiple screens to detect this self-generated radiation pattern, the system achieves improved detection capability without requiring additional external radiation sources or increased exposure levels.
3Object-affected harmful factors
If conventional detection methods are used, then radiation exposure is minimized, but detection capability for non-metallic objects is insufficient
Solution Approach 1:
The patent combines the detection capabilities of multiple screens into a unified detection system. By merging the signals from the first, second, and third screens, the system achieves enhanced detection capability for non-metallic objects while maintaining minimal radiation exposure through the use of scattered and transmitted radiation.
Solution Approach 2:
The detection system employs a composite approach by using multiple screen types or configurations (different positions, orientations, or detection mechanisms) within the same enclosure. This composite detection architecture enables improved differentiation of non-metallic objects from body background at low radiation levels.
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 system improves the detection capability and image quality of non-metallic objects while minimizing radiation exposure, enabling more efficient and accurate screening of individuals and baggage without the need for high radiation doses.
Implementation Method 1
A detection system employing multiple screens with scintillator materials like calcium tungstate and photomultiplier tubes within an enclosure to enhance the absorption and conversion of electromagnetic radiation into light
Implementation Method 2
A detection system employing multiple screens with scintillator materials like calcium tungstate and photomultiplier tubes within an enclosure to enhance the absorption and conversion of electromagnetic radiation into light
Implementation Method 3
maximizing the interaction of X-ray photons with the detector material
Implementation Method 4
detecting radiant energy that has been transmitted through the body, scattered from the body, and/or emitted from the body
Data Source
AI summary
The present specification discloses an improved detection system employing multiple screens for greater detection efficiency. More particularly, a first enclosure has two adjacent walls, each with interior surfaces, a first end and a second end. The first ends of the two adjacent walls are connected at an angle to form an interior and the second ends of the two adjacent walls are connected to a semi-circular housing. At least one substrate, positioned on each of the interior surfaces of the adjacent walls, has an active area for receiving and converting electromagnetic radiation into light. A photodetector, positioned in the interior portion of the semi-circular housing, has an active area responsive to the light.