Passive terahertz camera for standoff security screening
Erich N. Grossman, Charles Dietlein
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 ×4 m(vertical × 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.
and Dietlein, C.
Passive terahertz camera for standoff security screening, Applied Optics, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=905973
(Accessed December 9, 2023)