Development of passive millimeter wave imaging for concealed weapon detection indoors

Abstract

this MZI waveguide sensor with optimized sensing length of 1,1515 mm is 225.4 dB/RIU. We know that DL 53r=sensitivity , where 3r is the standard deviation of the system [12]. Following the magnification of the measured standard deviation 3r in Figure 4(b), the refractive sensing DL in three standard deviations is with the magnitude of 10 26 RIU. CONCLUSIONThis study theoretically and experimentally investigated the periodic ambiguity of the MZI waveguide sensor without increasing complexity in standard fabrication process and testing system. The improved sensor with a sensitivity of 225.4 dB/RIU, a DL of 10 26 RIU, a measuring range from 1.31 to 1.42, and a high repeatability, operates at 1550-nm wavelength, is fully competent in refractive sensing field. Further research will focus on immobilizing a sensitive layer for specific biochemical applications [13, 14]. ACKNOWLEDGMENTSThe authors wish to express their gratitude to the National-A surface-plasmonresonance sensor based on photonic-crystal-fiber with large size microfluidic channels, Opt Appl 42 (2012), 493-501. 4. M.S. Luchansky and R.C. Bailey, High-Q optical sensors for chemical and biological analysis, Anal Chem 84 (2012), 793-821. 5.

Optimized Design of W-Band Quasi-Optical Lens by Using Optical Simulator and Numerical Analysis

“…When the value of d increases to 712 mm, c a falls to 0.896. It shall be noted that the spillover loss has been included in formula (4).…”

“…This makes MMW technology favorable for security surveillance, especially for the detection of weapons concealed under peoples' clothes [1][2][3][4]. Focal plane array (FPA) technology is useful for MMW imaging system due to its ability of greatly increasing the imaging frame rate [5].…”

An auto‐classification procedure for concealed weapon detection in millimeter‐wave radiometric imaging systems

“…One of the important applications of PMMW imaging is doubtlessly the detection of hidden weapons in airports and other checkpoint sites . For the recent years, many researchers have demonstrated that PMMW imaging can be an effective method for detecting and imaging concealed dangerous objects such as guns, knives, dielectric explosives with fair image features . Although active imaging systems at millimeter wave frequencies have the potential of being harmful to the nearby people, PMMW imaging technology provides completely safe detection of concealed weapons because of the fact that PMMW receiver only gathers the passive, non‐ionizing radiation from the target.…”

3D Holographic Millimeter-Wave Imaging for Concealed Metallic Forging Objects Detection

“…Various imaging techniques include infrared imaging [5,6], passive millimeter-wave (MMW) imaging [7][8][9], active MMW imaging [10,11], X-ray imaging [12,13] and holographic imaging [14][15][16][17] have been investigated for concealed metallic object detection. Recent studies have demonstrated that passive MMW imaging has the most potential to become a useful tool to identify concealed MFOs under clothing [18,19], which has been investigated for various applications include security, military, surveillance and biomedical [20].…”