Millimeter Wave MIMO Array for Non-Ionizing Security Imaging
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Solution Overview
Problem
Current security inspection methods, such as metal detectors and X-ray scanners, are inadequate for detecting non-metallic substances like drugs and explosives, and manual inspections are inefficient and inconvenient, posing health risks due to ionizing radiation.
Innovation Solution
A security inspection apparatus utilizing a two-dimensional multiple-input multiple-output (MIMO) array panel that transmits electromagnetic waves to an inspected object and reconstructs an image using echo signals, allowing for automatic detection without the need to remove shoes, enhancing speed and accuracy while avoiding ionizing radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual security inspection is used, then security personnel can detect dangerous goods, but inspection speed is slow and convenience is poor
Solution Approach 1:
The patent replaces manual mechanical inspection with an automated electromagnetic wave-based detection system. The millimeter wave radar system automatically scans and images the inspected object without requiring manual intervention, thereby maintaining high detection accuracy while dramatically improving inspection speed and convenience.
Solution Approach 2:
The inspected object remains stationary on the platform while the system performs automatic detection and imaging. The object serves itself by simply being placed on the platform, eliminating the need for manual inspection operations and significantly improving inspection efficiency.
2Measurement precision
If X-ray security inspection is used, then imaging capability is provided, but ionizing radiation affects human health
Solution Approach 1:
The patent changes the fundamental parameter of the detection wave from ionizing X-rays to non-ionizing millimeter waves. This parameter change maintains the imaging capability while eliminating the harmful ionizing radiation effects on human health, allowing safe and repeated exposure during security inspections.
3Productivity
If metal detector is used, then detection speed is fast, but non-metallic substances cannot be detected
Solution Approach 1:
The millimeter wave radar system provides universal detection capability that can detect both metallic and non-metallic substances. Unlike metal detectors that are limited to conductive materials, the electromagnetic wave-based system can detect dielectric materials, drugs, explosives, and other non-metallic dangerous goods, greatly expanding detection versatility while maintaining fast inspection 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 apparatus provides high detection accuracy and convenience by enabling automatic security inspections of objects without the need to remove shoes, improving user experience and reducing inspection time, while using non-ionizing millimeter waves for safe imaging.
Implementation Method 1
a two-dimensional multiple-input multiple-output array panel arranged on the bottom plate and parallel to the bottom plate, including: at least one two-dimensional multiple-input multiple-output sub-array, wherein each two-dimensional multiple-input multiple-output sub-array includes a plurality of transmitting antennas and a plurality of receiving antennas... configured to control the plurality of transmitting antennas to transmit a detection signal in a form of an electromagnetic wave to an inspected object... and to control the plurality of receiving antennas to receive an echo signal from the inspected object
Implementation Method 2
a signal processing device connected to the two-dimensional multiple-input multiple-output array panel and configured to reconstruct an image of the inspected object according to the echo signal received
Implementation Method 3
using non-ionizing millimeter waves for safe imaging
Data Source
AI summary
A security inspection apparatus and a method of controlling the same are described. An example security inspection apparatus includes a bottom plate configured to carry an inspected object and a two-dimensional multi-input multi-output array panel, including at least one two-dimensional multi-input multi-output sub-array. Each two-dimensional multi-input multi-output sub-array includes transmitting antennas and receiving antennas arranged such that equivalent phase centers are arranged in a two-dimensional array. The security inspection apparatus includes a control circuit configured to control the transmitting antennas to transmit a detection signal in a form of an electromagnetic wave to the inspected object in a preset order, and to control the receiving antennas to receive an echo signal from the inspected object. The security inspection apparatus includes a signal processing device configured to reconstruct an image of an inspected object based on an echo signal received and a display device configured to display the reconstructed image.