Real-time passive MMW/THz imaging system for concealed weapon detection

• Published in: Journal of optics (New Delhi) Vol. 53; no. 4; pp. 3082 - 3097
• Main Author: Ünal, A.
• Format: Journal Article
• Language: English
• Published: New Delhi Springer India 01-09-2024
• Subjects: Lasers; Optical Devices; Optics; Photonics; Physics; Physics and Astronomy; Research Article; Semi-active millimeter wave; Passive millimeter wave; Rosetta scan; Concealed weapon detection; Passive Terahertz wave; Semi-active terahertz wave
• ISSN: 0972-8821; 0974-6900
• DOI: 10.1007/s12596-023-01590-3

Passive millimeter wave (MMW) and terahertz (THz) waves have shown the potential for detecting hidden objects concealed beneath clothing materials. This has led to extensive research in this field, with a focus on developing imaging systems that can detect concealed weapons on humans. The article introduces a novel approach to real-time passive MMW/THz imaging systems specifically designed for detecting hidden objects on moving people. Unlike existing imaging systems, which often require multiple receivers or complex setups, the proposed system achieves real-time imaging using a single pixel in a low-cost manner. The article also explores multiple-pixel configurations to enhance the system’s performance. The scanning mechanisms of the systems were simulated in the W band of the electromagnetic spectrum, and scanning pattern parameters were determined in the concept of real-time imaging. Single and multiple-pixel passive MMW/THz imaging systems’ behaviours were tested for stationary targets with a pan-tilt unit to verify the measurement intervals in order to validate the Roetta scanning patterns, and the findings were shared in the article. Furthermore, while the scanning methods presented were primarily developed for passive MMW/THz imaging, this study also highlights the potential for semi-active usage with the new scanning method in these bands.
The research presented in this article contributes to the advancement of real-time imaging systems for concealed weapon detection using passive or semi-active MMW/THz technology. It offers valuable insights and methodologies that can aid in the development of future imaging systems for enhanced security applications.