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 m X 4 m (vertical X horizontal) field of view (FOV) at a standoff range of 8 m. The focal plane array is cooled to 4 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 s~(-1), is 1.25 K near the center of the array and 2 K overall.
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机译：我们描述了基于模块化的，64点线性低温低温微测辐射热计的无源实时太赫兹相机的构造和性能。反射型锥形扫描仪以8 m的隔离范围扫出2 m X 4 m（垂直X水平）视场（FOV）。将焦平面阵列在闭环制冷机中冷却至4 K，并在宽带平面螺旋天线馈源的超导Nb或NbN的独立式电桥上检测信号。焦平面阵列的NETD，相对于目标平面和5 s〜（-1）的帧速率，在阵列中心附近为1.25 K，整体为2K。
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