Dual-Field Body Scanner Reducing False Alarms
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Solution Overview
Problem
Full-body scanners experience high rates of false alarms when detecting non-metal objects, leading to inconvenient and time-consuming manual inspections, as they are not adapted to distinguish between metal and non-metal objects effectively.
Innovation Solution
A dual detection system combining inductive field-type detection means and microwave field imaging-type detection means, where the sensitivity of the microwave imaging is adjusted based on the output from the inductive detection, optimizing the sensitivity levels to reduce false alarms by using a lower sensitivity for non-metal object detection and a higher sensitivity only when metal objects are detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full-body scanners use microwave field imaging to detect non-metal objects, then detection capability for non-metal objects is improved, but false alarm rate increases significantly
Solution Approach 1:
The detection system is segmented into two independent subsystems: inductive field detection means for metal objects and microwave field imaging means for non-metal objects. Each subsystem operates independently with optimized parameters, avoiding the false alarm problem by not forcing microwave imaging to detect both metal and non-metal objects simultaneously.
Solution Approach 2:
The system dynamically switches between inductive field detection and microwave field imaging based on the detection results. When metal objects are detected by the inductive field means, the system activates microwave imaging for further inspection; otherwise, it relies on inductive field detection alone, thereby reducing false alarms while maintaining detection capability.
2Measurement precision
If full-body scanners increase sensitivity to detect small metal parts, then detection precision for metal objects is improved, but false alarm rate increases
Solution Approach 1:
The system separates metal detection (inductive field) from non-metal detection (microwave imaging), allowing each subsystem to operate at optimized sensitivity levels without cross-interference. The inductive field means can maintain high sensitivity for small metal parts without generating false alarms that would occur if microwave imaging attempted the same task.
Solution Approach 2:
The inductive field detection means acts as an intermediary that pre-screens for metal objects before microwave imaging is activated. This intermediary step filters out false alarms by identifying metal objects through their electromagnetic properties, allowing microwave imaging to focus only on non-metal detection with appropriate sensitivity settings.
3Reliability
If dual detection system activates microwave imaging for all individuals, then comprehensive security coverage is improved, but processing time increases
Solution Approach 1:
The system dynamically activates microwave field imaging only when the inductive field detection means identifies metal objects. For individuals without metal objects, only the faster inductive field detection is performed, significantly reducing processing time while maintaining comprehensive security coverage for those who require it.
Solution Approach 2:
The inductive field detection means performs preliminary screening of all individuals first, identifying candidates for further microwave imaging inspection. This preliminary action filters out the majority of individuals who do not require microwave imaging, thereby maintaining security coverage while improving overall processing speed.
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 significantly reduces the overall rate of false alarms from 65% to 20%, improving the efficiency and accuracy of security screenings by tailoring sensitivity levels to the specific threat detected, thereby enhancing both security and flow performance.
Implementation Method 1
walk-through metal detector based on a detection based on an inductive-type field generated by coils
Implementation Method 2
full-body scanners use microwave field-based imaging detection
Data Source
AI summary
The present invention relates to a detection system comprising detection means (140) of the inductive field type and detection means (10) using microwave field-based imaging, analysis means (50) which are suitable for analysing the signals from the inductive detection means (140) and for deducing therefrom the potential presence of the metal targets, and means which are suitable for correspondingly modifying, at least in a zone of interest, the sensitivity of the detection means (10) using microwave-based imaging.