New Jersey Institute of Technology

Dale E Gary

John F Federici

Robert Barat

An interferometric and synthetic aperture THz incoherent imaging system is provided, in which a high-power electronic source such as a 0.094 THz Gunn Oscillator is integrated with a continuous-wave (CW) terahertz detection system in order to achieve a high signal-to-noise ratio. THz imaging of a point source located 10 m away from the detector array is presented. A 2-D THz reflective image is reconstructed with only four detectors using rotational synthesis.

System and method for terahertz 2D interferometric and synthetic aperture imaging with an incoherent source

Near field imaging using a THz imaging system is realized by utilizing an interferometric imaging detector array that includes detector elements disposed on a surface curved, physically or artificially, to match substantially the curvature of the wave front for received THz signals. Generally, the near field is an environment wherein the distance to an object of interest is on the order of 10&#x2013;100 times larger than the physical size of the THz imaging array. Typical distances from the object or target to the imaging array is anticipated to be in the 0.5 m&#x2013;50 m range. Curvature of the detector array corrects a distortion problem in prior THz imaging systems that utilized planar interferometric imaging arrays based on a planar wave front assumption for received THz signals.

Terahertz imaging for near field objects

THz imaging apparatus and methods are provided for rapidly and effectively examining a region of interest to determine the presence of specified compositions. The apparatus includes means for generating electromagnetic radiation of a desired terahertz frequency suitable for the examination, and for rendering the radiation incident at the region of interest. Detector means are provided at a plurality of points in a plane spaced from the region of interest, for detecting the terahertz radiation reflected from or transmitted through the region. Means are provided for converting the detected terahertz radiation to an image of the region of interest from which the presence of the specified compositions are determinable.

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Berkely Heights, NJ, United States of America

Dale E Gary