Technologies may be developed that may allow guns, bombs, chemicals to be detected using ordinary Wi - Fi radio waves
By Christiaan Colen
In an inspection site that must pass through before traveling on an airplane, inspections are being conducted to check the contents of baggage using X-rays. Technologies are being announced that make it possible to carry out this inspection requiring a large scale of equipment only by using ordinary Wi - Fi equipment.
(PDF) Towards In baggage Suspicious Object Detection Using Commodity WiFi.pdf
Common Wifi can detect weapons, bombs and chemicals in bags | EurekAlert! Science News
https://eurekalert.org/pub_releases/2018-08/ru-cwc081418.php
This method is being studied by Professor Jennifer Chen of Rutgers University New Brunswick campus engineering department. By irradiating the object with Wi-Fi radio waves and receiving and analyzing the state of reflection and transmission by the receiver, it is possible to analyze the metal objects, dangerous substances, chemicals, etc. contained in the object Can be detected.
In this system, Wi-Fi radio waves "channel state information (Channel State Information: CSI)" for street-friendliness can be seen when passing through the object by analyzing a mechanism to grasp the situation of the object has been incorporated. For detection, Wi-Fi equipment with 2 to 3 antennas is used and antennas are arranged in the following pattern.
Then, it irradiates the radio waves of Wi-Fi, and recognizes the material type of the dangerous goods based on "CSI decoded value" composed of amplitude information and phase information of the radio wave at that time. Next, we will judge the degree of danger of the object by detecting the volume of liquid and the shape of metal material.
Using this technology, the research team conducted experiments using 15 kinds of metal and liquid objects and 6 kinds of bags in 6 months. As a result, we detected 95% or more of suspicious objects contained in the bag and succeeded in identifying the type of dangerous goods with an accuracy of 90%. Also, when measuring the liquid capacity and the dimensions of metallic objects, it is also made clear that their errors were "16 ml" and "0.5 cm", respectively.
Mr. Chen said, "In large public places it is difficult to introduce expensive inspection equipment like those used at the airport." "Manpower is always necessary to check the contents of bags. "We wanted to develop a complementary method to reduce the number of people," he says, explaining the possibilities as a convenient inspection apparatus instead of X-ray equipment.
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