Terahertz imaging for near field objects

Details Terahertz imaging for near field objects Terahertz imaging for near field objects

2006-09-12

2006-09-12

Porta, David (Department: 2884)

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

Reexamination Certificate

active

07105820

ABSTRACT:
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 10–100 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–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.

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John F. Federici, et al., “Terahertz imaging using an interferometric array”, Applied Physics Letters, vol. 83, No. 12, Sep. 22, 2003, pp. 2477-2479.

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