Millimeter wave inspection of concealed objects

Imaging concealed objects with a millimeter-wave coherent beam is accompanied with speckle. Two tools were chosen to improve visibility of concealed objects for security or industrial inspection: a speckle contrast image (image processing tool) and a Hadamard diffuser (mechanical tool). We report more then 50% speckle reduction over the full W-band. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2733–2737, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22870