A passive, fully staring THz video camera based on kinetic inductance bolometer arrays

J Luomahaara, H Sipola, L Grönberg… - IEEE Transactions …, 2020 - ieeexplore.ieee.org
J Luomahaara, H Sipola, L Grönberg, A Mäyrä, M Aikio, A Timofeev, K Tappura
IEEE Transactions on Terahertz Science and Technology, 2020ieeexplore.ieee.org
Current state-of-the-art security video cameras operating in the THz regime employ up to a
few hundred detectors together with optomechanical scanning to cover an adequate fieldof-
view for practical concealed object detection. As a downside, the scanning reduces the
integration time per pixel compromising sensitivity, increases the complexity, and reduces
the reliability of the system. In contrast to this, we demonstrate a video camera, for the first
time, basing its operation on the concept of a fully staring 2-D detector array with a single …
Current state-of-the-art security video cameras operating in the THz regime employ up to a few hundred detectors together with optomechanical scanning to cover an adequate fieldof-view for practical concealed object detection. As a downside, the scanning reduces the integration time per pixel compromising sensitivity, increases the complexity, and reduces the reliability of the system. In contrast to this, we demonstrate a video camera, for the first time, basing its operation on the concept of a fully staring 2-D detector array with a single detector element responsible for a single imaged pixel. The imaging system is built around the detector technology of kinetic inductance bolometers, allowing the operation in the intermediate temperature range >5K and the scale-up of the detector count into multikilo-pixel arrays and beyond. The system is designed for a field-of-view of 2 × 1 m 2 and an imaging distance of 2.5 m. We describe the main components of the system and show images from concealed object experiments performed at a near-video rate of 9 Hz.
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