Journal
APPLIED OPTICS
Volume 49, Issue 19, Pages E106-E120Publisher
OPTICAL SOC AMER
DOI: 10.1364/AO.49.00E106
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Funding
- Finnish Funding Agency for Technology and Innovation (TEKES) [40306/07]
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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. (C) 2010 Optical Society of America
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