Passive terahertz camera for standoff security screening

E. Grossman (Corresponding Author), C. Dietlein, J. Ala-Laurinaho, Mikko Leivo, Leif Grönberg, Markus Grönholm, Petteri Lappalainen, Anssi Rautiainen, A. Tamminen, Arttu Luukanen

Research output: Contribution to journalArticleScientificpeer-review

78 Citations (Scopus)

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 languageEnglish
Pages (from-to)E106-E120
Number of pages15
JournalApplied Optics
Volume49
Issue number19
DOIs
Publication statusPublished - 2010
MoE publication typeA1 Journal article-refereed

Fingerprint

Focal plane arrays
focal plane devices
Screening
screening
Closed cycle machinery
Cameras
cameras
spiral antennas
Spiral antennas
closed cycles
refrigerators
Antenna feeders
linear arrays
Cryogenics
scanners
cryogenics
field of view
broadband

Cite this

Grossman, E., Dietlein, C., Ala-Laurinaho, J., Leivo, M., Grönberg, L., Grönholm, M., ... Luukanen, A. (2010). Passive terahertz camera for standoff security screening. Applied Optics, 49(19), E106-E120. https://doi.org/10.1364/AO.49.00E106
Grossman, E. ; Dietlein, C. ; Ala-Laurinaho, J. ; Leivo, Mikko ; Grönberg, Leif ; Grönholm, Markus ; Lappalainen, Petteri ; Rautiainen, Anssi ; Tamminen, A. ; Luukanen, Arttu. / Passive terahertz camera for standoff security screening. In: Applied Optics. 2010 ; Vol. 49, No. 19. pp. E106-E120.
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Grossman, E, Dietlein, C, Ala-Laurinaho, J, Leivo, M, Grönberg, L, Grönholm, M, Lappalainen, P, Rautiainen, A, Tamminen, A & Luukanen, A 2010, 'Passive terahertz camera for standoff security screening', Applied Optics, vol. 49, no. 19, pp. E106-E120. https://doi.org/10.1364/AO.49.00E106

Passive terahertz camera for standoff security screening. / Grossman, E. (Corresponding Author); Dietlein, C.; Ala-Laurinaho, J.; Leivo, Mikko; Grönberg, Leif; Grönholm, Markus; Lappalainen, Petteri; Rautiainen, Anssi; Tamminen, A.; Luukanen, Arttu.

In: Applied Optics, Vol. 49, No. 19, 2010, p. E106-E120.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Grossman, E.

AU - Dietlein, C.

AU - Ala-Laurinaho, J.

AU - Leivo, Mikko

AU - Grönberg, Leif

AU - Grönholm, Markus

AU - Lappalainen, Petteri

AU - Rautiainen, Anssi

AU - Tamminen, A.

AU - Luukanen, Arttu

PY - 2010

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AB - 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.

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Grossman E, Dietlein C, Ala-Laurinaho J, Leivo M, Grönberg L, Grönholm M et al. Passive terahertz camera for standoff security screening. Applied Optics. 2010;49(19):E106-E120. https://doi.org/10.1364/AO.49.00E106