## Abstract

We describe the construction and performance of a passive, real-time terahertz camera based on a modular, 64-element linear array of cryogenic hotspot microbolometers. A reflective conical scanner sweeps out a $2\text{}\mathrm{m}\times 4\text{}\mathrm{m}$ ($\text{vertical}\times \text{horizontal}$) field of view (FOV) at a standoff range of $8\text{}\mathrm{m}$. The focal plane array is cooled to $4\text{}\mathrm{K}$ in a closed cycle refrigerator, and the signals are detected on free-standing bridges of superconducting Nb or NbN at the feeds of broadband planar spiral antennas. The NETD of the focal-plane array, referred to the target plane and to a frame rate of $5\text{}{\mathrm{s}}^{-1}$, is $1.25\text{}\mathrm{K}$ near the center of the array and $2\text{}\mathrm{K}$ overall.

© 2010 Optical Society of America

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