Three-Transducer Metal Detector Spatial Discrimination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing metal detectors and body scanners face challenges in reliably detecting and locating prohibited objects, especially when these objects are camouflaged or distributed across the body, leading to complex and lengthy examination processes.
Innovation Solution
A system comprising a metal detector with at least three inductive transducers disposed on either side of a passage, combined with a body scanner, which adapts its sensitivity based on metal detection. This system allows for spatial discrimination of metal objects, determining their location in three-dimensional space, and streamlining the examination process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional metal detectors with single or dual coils are used, then the device complexity is low, but the ability to locate metal objects in three-dimensional space is insufficient
Solution Approach 1:
The detection system is segmented into multiple independent transducers (at least three) distributed in space, each capable of detecting metal objects independently. This segmentation allows the system to achieve three-dimensional location capability by combining data from multiple spatial positions, resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The invention transitions from two-dimensional detection (single plane) to three-dimensional detection by adding transducers at different spatial positions. The at least three transducers are arranged to detect metal objects in three-dimensional space, enabling precise location determination through spatial triangulation and signal processing.
2Reliability
If body scanners with high sensitivity are used to detect camouflaged objects, then the detection reliability improves, but the examination time increases and false alarms increase
Solution Approach 1:
The metal detector performs preliminary detection of metal objects before the full body scanner examination. By using at least three transducers to detect and locate metal objects in advance, the system can pre-identify areas of interest, allowing the body scanner to focus its high-sensitivity analysis only on those specific regions, thereby reducing overall examination time while maintaining detection reliability.
Solution Approach 2:
The system applies different detection strategies to different body regions. The metal detector with multiple transducers provides coarse localization, and then the body scanner applies high-sensitivity analysis only to the localized areas where metal objects are detected. This local quality approach ensures high detection reliability for camouflaged objects while minimizing the time and false alarms associated with full-body high-sensitivity scanning.
3Reliability
If multiple detection systems are integrated, then the detection capability improves, but the device complexity and operational complexity increase
Solution Approach 1:
The invention merges the metal detection function and body scanning function into a single integrated system. The metal detector with at least three transducers and the body scanner work together as a unified detection system, sharing common control and processing resources. This merging improves overall detection capability while simplifying operation compared to using separate independent systems.
Solution Approach 2:
The integrated system performs multiple functions: the metal detector with multiple transducers provides both metal object detection and localization, while also serving as a pre-scan for the body scanner. The body scanner then provides detailed imaging of the localized areas. This multi-functionality reduces operational complexity by consolidating multiple detection tasks into a single coordinated system.
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 enhances the detection of camouflaged objects by accurately locating metal objects on an individual, thereby improving the efficiency and accuracy of security screenings, reducing false alarms, and minimizing operator intervention.
Implementation Method 1
The transmitting coil is powered by an alternating electric current
Implementation Method 2
the signal phase change, due for example to the eddy currents generated on the metal object
Data Source
AI summary
A system for detecting forbidden objects worn or carried by individuals includes a metal detector having at least three transducers arranged on either side of a passage, two of these transducers being positioned on the one same side of the passage and spaced apart longitudinally in the direction of travel through the passage, while the third transducer is positioned on the opposite side of the passage so that the three transducers are available in combination to perform spatial discrimination of the location of the metallic objects detected.