Security portal with THz trans-receiver
First Claim
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1. 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.
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Abstract
A portal for security screening of transport passengers includes a THz trans-receiver. In one example of the portal, the trans-receiver includes a small-spot, reflective scanning arrangement including a single detector in a heterodyne receiver configuration. In another example, the trans-receiver includes a large-beam reflective scanning arrangement with the trans-receiver in a synthetic aperture radar (SAR) configuration.
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Citations
19 Claims
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1. Apparatus for examining a clothed person for detecting an object or substance concealed by the person'"'"'s clothing, the apparatus comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Apparatus for examining a clothed person for detecting an object or substance concealed by the person'"'"'s clothing, the apparatus comprising:
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a portal defining a position in the apparatus in which the person is positioned for examination; first and second terahertz (THz) trans-receivers for delivering first and second beams of terahertz radiation having respectively first and second wavelengths at which the positioned person'"'"'s clothing is at least partially transparent; an optical system arranged to direct the beams of THz radiation from the THz trans-receivers to a plurality of areas on the positioned person at different heights on the positioned person and at a plurality of different horizontal locations on the positioned person along each of the plurality of different heights, the optical system being further arranged to direct THz radiation reflected from the positioned person back to the THz trans-receivers; 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 at each of the different wavelengths and for processing the recorded data to provide an image of at least some portion of the positioned person. - View Dependent Claims (12)
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13. Apparatus for examining a clothed person for detecting an object or substance concealed by the person'"'"'s clothing, the apparatus comprising:
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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 at least partially transmitted by the 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 position person back to the THz trans-receiver, the optical system including a rotatable mirror encircled by a fixed ring mirror located at a height above the person and a vertically movable ring mirror located below the fixed ring mirror and having a diameter sufficient that the mirror can encircle the positioned person, the beam being directed from the rotatable mirror to the fixed ring mirror from the fixed ring mirror to the movable ring mirror and from the movable ring mirror to the positioned person and wherein vertically moving the movable ring mirror directs the beam to a plurality of different heights on the positioned person and rotating the rotatable mirror moves the beam to a plurality of different horizontal locations on the 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. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification