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(a) Experimental setup for terahertz imaging in the transmission (radioscopy) mode with the uncooled microbolometer focal plane array (FPA) as the recorder. (b) Optical system for imaging of objects under front illumination by terahertz radiation. The mirror enables illumination of the object with a beam of a low divergence (“reflection mode”). The scatterer enables diffuse illumination of the object (“scattering mode”). The mirror can be rotated at a high speed. (c) Draft of a Teflon detail used as a sample.
(a) Experimental setup for measurement of FPA responsivity. (b) An image of converging terahertz beam attenuated with a photolithographic polarizer was recorded by FPA. (c) Consequently, the incident beam was blocked with a plane-parallel glass plate of a Fuzeau interferometer and the polarizer was removed. The terahertz radiation that was absorbed in the glass heated it up, and the interference pattern formed by the probe laser beam enabled us to reconstruct an absolute value of terahertz-beam energy density distribution.
Images of a Teflon detail recorded by FPA in the reflection (a) and scattering (b) modes .
[(a)–(c)] Selected frames of a video recorded by a microbolometer FPA. A metal key (d) was front illuminated with a diffuse terahertz beam. Frame 73 is for the stationary scatterer; frame 89 is for the slowly rotating scatterer; and frame 339 is for the rapidly rotating scatterer .
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