Shoe Sole Detection via Microwave and Capacitive Analysis
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Solution Overview
Problem
Current detection methods for unauthorized objects or materials concealed in shoes, such as explosives, are unreliable due to the difficulty in visually or manually inspecting the internal cavities of shoes, particularly the sole, leading to incomplete security checks.
Innovation Solution
A device equipped with microwave transmitter and receiver means positioned on either side of the shoe sole, infrared transmitters and receivers for measuring width, and capacitive means to determine sole thickness, along with additional detection methods like metal detection coils and nuclear magnetic resonance analysis, to analyze parameters like transmission delay and amplitude, and normalize signals for enhanced detection reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If visual or manual inspection methods are used to detect concealed objects in shoes, then the inspection process is simple and quick, but the detection reliability is insufficient due to inability to access internal cavities
Solution Approach 1:
The patent replaces manual visual inspection and physical palpation with microwave-based detection systems. Microwave transmitting and receiving means are positioned to emit and detect microwaves through the shoe sole, enabling non-contact, non-invasive detection of concealed objects based on dielectric property differences without requiring physical access to internal cavities
Solution Approach 2:
The patent introduces microwave radiation as an intermediary to detect concealed objects. The microwave transmitting means emit microwaves that penetrate the shoe sole, and the receiving means detect the transmitted or reflected microwaves, using the microwave field as a mediator to indirectly sense objects hidden within the shoe's internal cavities
2Measurement precision
If microwave transmission delay and amplitude analysis are used to detect concealed objects, then detection precision is improved, but device complexity increases due to multiple sensors and signal processing requirements
Solution Approach 1:
The patent utilizes changes in microwave transmission parameters (delay and amplitude) caused by the presence of concealed objects. By measuring variations in these parameters compared to reference values, the system achieves precise detection of hidden objects without requiring complex imaging systems, relying instead on parameter deviation analysis
Solution Approach 2:
The patent employs microwave radiation that serves multiple detection functions simultaneously: it penetrates the shoe sole, interacts with concealed objects based on their dielectric properties, and provides detection information through both transmission delay and amplitude changes, enabling a single system to perform comprehensive concealed object detection
3Reliability
If multiple detection methods (microwave, infrared, capacitive) are combined to analyze shoe structure, then detection reliability is enhanced, but the device becomes more complex and harder to operate
Solution Approach 1:
The patent combines microwave transmitting and receiving means, infrared transmitting and receiving means for width measurement, and capacitive means for thickness determination into a single integrated detection device. These multiple detection systems work simultaneously to provide comprehensive analysis of the shoe's internal structure and concealed objects, enhancing detection reliability through multi-parameter measurement
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 device significantly improves the reliability of detecting concealed objects by providing detailed analysis of the shoe's internal structure and material composition, allowing for more effective identification of anomalies and unauthorized items.
Implementation Method 1
microwave transmitting means and microwave receiving means intended to be placed respectively on either side of the sole of the shoe
Implementation Method 2
the microwaves emitted by the transmitters is in the range of 5 GHz to 30 GHz, advantageously 12 GHz to 20 GHz
Implementation Method 3
The means for measuring the width of the element interposed between the microwave transmitting/receiving means include infrared transmitter/receivers adapted to measure the round-trip propagation time
Implementation Method 4
means for measuring the electrical capacitance formed between the lower surface of the sole and the foot, essentially the electrical capacitance formed by the sole of a shoe placed on the support base
Implementation Method 5
The device comprises a plurality of microwave transmitter/receiver means distributed along the length of the support base
Implementation Method 6
nuclear magnetic resonance analysis means including for example Helmholtz coils
Data Source
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Figure 5
AI summary
The present invention relates to a detection device for the detection of unauthorized objects or materials, comprising a support base (110) designed to receive at least one foot wearing its shoe, of an individual to be checked, and further comprising means (160) for measuring the electrical capacitance formed by the sole of a shoe placed on the support base (110).