Wireless Metal Detection via Electromagnetic Signal Reflection
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Solution Overview
Problem
Current metal detection methods are limited by high implementation costs, bulkiness, and safety concerns with X-ray technology, and require close proximity and cooperation from individuals, while electromagnetic induction methods have restricted scope and speed.
Innovation Solution
A wireless network-based method using wireless electromagnetic wave signals transmitted and received by devices indoors, with abnormality analysis and feature extraction to trigger an alarm upon detection of metal items, allowing for long-distance and flexible detection without human intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If X-ray penetration technology is used for metal detection, then detection accuracy is improved, but implementation cost increases and safety hazards are introduced
Solution Approach 1:
The patent replaces the mechanical/X-ray detection system with an electromagnetic field-based wireless signal detection system. Instead of using ionizing radiation (X-ray), the system uses wireless electromagnetic signals to detect metal objects through their impact on the electromagnetic field, thereby eliminating safety hazards while maintaining detection capability
Solution Approach 2:
The patent changes the detection parameter from X-ray penetration to electromagnetic field interaction. By monitoring changes in wireless signal parameters (strength, phase, timing) caused by metal objects' impact on the electromagnetic field, the system achieves metal detection without using harmful radiation
2Object-affected harmful factors
If electromagnetic induction method is used for metal detection, then cost is reduced and safety is improved, but detection scope and speed are limited
Solution Approach 1:
The patent makes the wireless signal transmitting and receiving devices serve multiple functions: they act as both wireless communication devices and metal detection sensors. The same electromagnetic field used for wireless communication is also used for metal detection, enabling the system to perform both functions simultaneously without requiring dedicated detection equipment
Solution Approach 2:
The wireless communication infrastructure itself serves the metal detection function. The existing wireless signals automatically interact with metal objects in the environment, and the system passively monitors these interactions without requiring active detection operations, enabling continuous background detection
3Ease of operation
If hand-held metal detector is used, then portability is improved, but detection requires close proximity to the object
Solution Approach 1:
The patent transitions from close-proximity handheld detection to long-distance fixed-location detection by utilizing the propagation characteristics of electromagnetic waves in three-dimensional space. Wireless signals can travel through air over longer distances compared to the near-field electromagnetic induction required by traditional metal detectors, enabling detection at a distance
4Reliability
If fixed door-shaped metal detector is used, then detection stability is improved, but flexibility and movement capability are reduced
Solution Approach 1:
The patent creates a dynamic detection system where wireless signal transmitting and receiving devices can be flexibly deployed and repositioned as needed. Unlike fixed door-shaped detectors, this system can be installed in various locations and configurations, adapting to different environments and detection requirements while maintaining stable detection performance
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 method enables easy deployment, low-cost, and non-invasive metal detection with increased scope and speed, leveraging the higher reflectivity of metal items to electromagnetic waves for accurate discrimination.
Implementation Method 1
the received wireless electromagnetic wave signals comprising wireless electromagnetic wave signals transmitted by the wireless signal transmitting device and wireless electromagnetic wave signals reflected by surrounding walls and indoor items
Data Source
AI summary
A wireless network based method for detecting carrying of metal, comprising: installing a wireless signal transmitting device and a wireless signal receiving device indoors; continuously transmitting to the surrounding, by the wireless signal transmitting device, wireless electromagnetic wave signals; continuously receiving, by the wireless signal receiving device, the wireless electromagnetic wave signals; continuously performing, through a signal abnormity detection system, abnormity analysis to the received wireless electromagnetic wave signals, and if any abnormality is determined, performing further analysis in the next step S5 to wireless electromagnetic wave signals within an abnormal waveband; and S5: extracting, through a date feature analysis system, a feature value of the wireless electromagnetic wave signals within the abnormal waveband, comparing and matching the feature value with features stored in an abnormal feature library, and if the feature of the wireless electromagnetic wave signals matches the feature of metal successfully, triggering an alarm device.