Latest Trends in Millimeter-Wave Imaging Technology

Abstract

Abstract-This paper overviews the latest trends of millimeterwave (MMW) imaging technologies, focusing mainly on applications of and technical parameter variations for security surveillance and nondestructive inspections (NDI). We introduce a smart NDI tool using active W-band imaging, which is capable of detecting hidden surface cracks in concrete structures.

The Experimental Results of a Low Power X-Band Free Electron Maser by Electron Pre-Bunching

“…In addition to that, the free electron laser potential implementation in the THz spectrum (below 300 µm wavelength) would lead to the following benefits [16][17][18]:…”

“…If the wavelength ranges from 3 mm to 300 µm, the free electron laser may be potentially applied as a variable wavelength source to optimize the increase in chemical reaction rates induced by the applications of microwaves [16,17]. Applications for solid inorganic materials are transformation in hardening of metals, heating of glass and ceramics, melting of concrete and stress hardening of glass.…”

“…Applications for solid organic materials are cooking, drying, paint and welding plastics. Applications for liquid materials are pasteurization and sterilization, glue softening, crystallization and casting processes [16][17][18]. The 30-300 µm wavelength stage is designed to study the same problems as the previous wavelength range but the shorter wavelength would be expected to have different penetration and absorption characteristics.…”

“…and microwave driven plasma discharge. The applications of microwave plasma torch are for welding and cutting of metals and ceramics [16,17]. The microwave-driven plasma discharge is used for breaking down toxic organic substances into their less harmless constituent elements for pollution control [16][17][18].…”

SUB-MILLIMETER WAVE FREQUENCY SCANNING 8 x 1 ANTENNA ARRAY

“…During the last decade, a large research effort has been dedicated to the development of sub-millimeter wave technology (300 GHz-3 THz), due to the large number of potential applications in different areas, such as terahertz imaging and sensing [1][2][3][4][5][6][7][8][9][10][11], wireless communications [12], radio-astronomy [13], fast measurement systems [14], non-destructive material analysis [15][16][17][18], or non-ionizing diagnosis [19][20][21][22], among others.…”