Faraday Cage RF Detection for Stowaway Screening
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Solution Overview
Problem
Current methods for detecting concealed living beings within loads, such as stowaways or animals, are inefficient due to high costs, unreliable detection, potential operator danger, and the need for intrusive methods that cannot penetrate metal casings or hermetic enclosures, especially when loads are unknown or heterogeneous.
Innovation Solution
An apparatus using a Faraday cage enclosure with a radio frequency transmission-reception system and spectral analysis to detect secondary electromagnetic radiation caused by body movements within the load, allowing for non-intrusive, reliable detection without exposing operators to radiation, even in loads with metal casings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electromagnetic radiation is used to detect movement inside a load, then detection sensitivity is improved, but the radiation may be blocked by metal casings or hermetic enclosures
Solution Approach 1:
The system segments the electromagnetic radiation into multiple frequencies, including at least one frequency specifically chosen to penetrate metal enclosures. This allows the detection system to bypass the blocking effect by using a spectrum of frequencies rather than a single frequency, thereby maintaining detection sensitivity through conductive or metallic load envelopes.
2Reliability
If access to the interior of the load is required for detection, then detection reliability is improved, but operator safety is compromised and the method becomes intrusive
Solution Approach 1:
The system replaces mechanical intrusion (physical access to the load interior) with electromagnetic wave-based remote detection. The electromagnetic radiation penetrates the load envelope and detects movements inside without requiring an operator or probe to physically enter the load, thereby maintaining detection reliability while eliminating operator exposure to dangerous environments.
3Reliability
If hand search or search dogs are used, then detection capability is provided, but the duration of the check becomes too long for flowing loads
Solution Approach 1:
The system enables continuous detection by using electromagnetic radiation that can penetrate load envelopes and detect movements in real-time as loads pass through the checkpoint. This continuous wave-based detection method eliminates the need to stop or slow down loads for manual searching, thereby maintaining high detection capability while enabling rapid processing of flowing loads.
4Power
If ionizing radiation is used for detection, then detection power is improved, but safety risks to operators and persons sought increase
Solution Approach 1:
The system changes the parameter of radiation type from ionizing to non-ionizing electromagnetic radiation. This parameter change maintains sufficient detection power to detect movements inside loads while eliminating the harmful ionizing effects that pose safety risks to operators and persons being searched, thereby resolving the contradiction between detection effectiveness and safety.
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 solution enables effective detection of body movements within loads, reducing false alarms and operator risk, while maintaining sensitivity and compatibility with variable load configurations, including those with metal enclosures, by confining electromagnetic radiation and analyzing secondary radiation for specific spectral characteristics.
Implementation Method 1
an enclosure device, which is adapted to contain the load and to form a Faraday cage around the load
Implementation Method 2
a radio frequency transmission-reception system, which is adapted to produce primary electromagnetic radiation inside the Faraday cage and the load, and to detect at least one secondary electromagnetic radiation generated from the primary radiation by a movement occurring in loading
Implementation Method 3
a spectral analysis system, which is connected at the input to a detection output of the transmission-reception system, and which is adapted to produce an alarm signal when the secondary radiation has spectral characteristics which are included in a memorized detection target
Data Source
Figure 1a~1c
Figure 2
Figure 3~4b
AI summary
An apparatus for detecting the motion of a masked body which is present in a load (100) combines an emission-reception of radiation through the load, and the production of a Faraday cage (1) around the load. The apparatus exhibits a sensitivity which is compatible with detection of the presence of live beings, without an operator entering the load or a probe being introduced thereinto.