Patent ID: 7378658

Claim:
Apparatus for examining a clothed person for detecting an object or substance concealed by the person's clothing, the apparatus comprising: a portal defining a position in the apparatus in which the person is positioned for examination; a terahertz (THz) trans-receiver arranged to provide a beam of THz radiation having a frequency such that the THz radiation is transmitted by the positioned person's clothing; an optical system for directing a beam of THz radiation from the THz trans-receiver to the positioned person and directing radiation reflected from the positioned person back to the THz trans-receiver, the optical system including a vertically movable mirror for directing the beam to a plurality of different heights on the positioned person and an angular scanning device for moving the beam to a plurality of different horizontal locations on the positioned person along each of the plurality of different heights; and signal processing electronics for recording data including at least one parameter of radiation reflected from the positioned person at the different heights and locations therealong and for processing the recorded data to provide an image of at least some portion of the positioned person.