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 2m×4m (vertical×horizontal) field of view (FOV) at a standoff range of 8m. The focal plane array is cooled to 4K 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 5s−1, is 1.25K near the center of the array and 2K overall.
Original language | English |
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Pages (from-to) | E106-E120 |
Number of pages | 15 |
Journal | Applied Optics |
Volume | 49 |
Issue number | 19 |
DOIs | |
Publication status | Published - 2010 |
MoE publication type | A1 Journal article-refereed |