Abstract
Conventional liquid detection instruments are very expensive and not conducive to large-scale deployment. In this work, we propose a method for detecting and identifying suspicious liquids based on the dielectric constant by utilizing the radio signals at a 5G frequency band. There are three major experiments: first, we use wireless channel information (WCI) to distinguish between suspicious and nonsuspicious liquids; then we identify the type of suspicious liquids; and finally, we distinguish the different concentrations of alcohol. The K-Nearest Neighbor (KNN) algorithm is used to classify the amplitude information extracted from the WCI matrix to detect and identify liquids, which is suitable for multimodal problems and easy to implement without training. The experimental result analysis showed that our method could detect more than 98% of the suspicious liquids, identify more than 97% of the suspicious liquid types, and distinguish up to 94% of the different concentrations of alcohol.
Highlights
The illegal carrying and transportation of flammable and explosive liquids seriously affects public safety
We used the K-Nearest Neighbor (KNN) algorithm to classify the amplitude information extracted from the wireless channel information (WCI) matrix to detect liquids
The bandwidth was 20 MHz, and the output power of the transmitter was set at −5 dBm
Summary
The illegal carrying and transportation of flammable and explosive liquids seriously affects public safety. Flammable and explosive liquids such as gasoline and alcohol are commonly used in various terrorist activities. The safety inspection of flammable and explosive liquids is of great significance for ensuring public safety. It has broad application prospects in the fields of public security, civil aviation, and customs. Liquids cannot be identified by the naked eye, and it is difficult to carry out dangerous liquid inspection in crowded places, which is a great challenge for security personnel. Forbid passengers to carry large amounts of liquid has become the main method to prevent terrorist attacks. It is necessary to introduce a new suspicious liquid detection scheme which is more economical and covers a wider range
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