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MetaDetection: wireless intelligent detection of multiliquids by using space-time-coding metasurface.

Shi Han Dai1, Yan Shi1, Yuan Hu1

  • 1School of Electronic Engineering, Xidian University, Xi'an 710071, China.

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|August 14, 2025
PubMed
Summary

This study presents a wireless intelligent system for hazardous liquid detection using programmable metasurfaces and software-defined radio. The system achieves high accuracy and cost-effectiveness for public safety applications.

Keywords:
artificial intelligenceintelligent sensing systemorthogonal frequency division multiplexing (OFDM)software-defined radio technologyspatiotemporal coding programmable metasurfaces

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Area of Science:

  • Electrical Engineering
  • Computer Science
  • Materials Science

Background:

  • Public safety demands advanced hazardous liquid detection.
  • Conventional methods lack accuracy, efficiency, and scalability.
  • Need for cost-effective, intelligent detection solutions.

Purpose of the Study:

  • To develop a wireless intelligent system for detecting suspicious liquids.
  • To leverage programmable metasurface and software-defined radio technologies.
  • To provide a scalable and accurate solution for hazardous substance detection.

Main Methods:

  • Utilized a spatiotemporal coding metasurface to transmit orthogonal frequency division multiplexing (OFDM) Wi-Fi signals.
  • Manipulated spectral harmonic distribution of OFDM subcarriers for multiple detection channels.
  • Integrated artificial intelligence (AI) algorithms for feature extraction from channel state information (CSI).

Main Results:

  • Achieved high accuracy in simultaneous detection and classification of multiple liquids.
  • Demonstrated robust immunity to ambient interference (signals, temperature, humidity).
  • The system proved cost-effective and scalable for real-world applications.

Conclusions:

  • The proposed wireless intelligent system offers a novel approach to hazardous liquid detection.
  • It provides a cost-effective, scalable, and intelligent solution for enhanced public safety.
  • The technology has transformative potential for security screening and hazard identification.