Passive terahertz camera for standoff security screening

Erich Grossman; Charles Dietlein; Juha Ala-Laurinaho; Mikko Leivo; Leif Grönberg; Markus Grönholm; Petteri Lappalainen; Anssi Rautiainen; Aleksi Tamminen; Arttu Luukanen

doi:10.1364/AO.49.00E106

Passive terahertz camera for standoff security screening

Erich Grossman^*
, Charles Dietlein
, Juha Ala-Laurinaho
, Mikko Leivo
, Leif Grönberg
, Markus Grönholm
, Petteri Lappalainen
, Anssi Rautiainen
, Aleksi Tamminen
, Arttu Luukanen

^*Corresponding author for this work

National Institute of Standards and Technology (NIST)
Helsinki University of Technology

Research output: Contribution to journal › Article › Scientific › peer-review

127 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 language	English
Pages (from-to)	E106-E120
Journal	Applied Optics
Volume	49
Issue number	19
DOIs	https://doi.org/10.1364/AO.49.00E106
Publication status	Published - 2010
MoE publication type	A1 Journal article-refereed

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10.1364/AO.49.00E106

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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.",

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doi = "10.1364/AO.49.00E106",

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T1 - Passive terahertz camera for standoff security screening

AU - Grossman, Erich

AU - Dietlein, Charles

AU - Ala-Laurinaho, Juha

AU - Leivo, Mikko

AU - Grönberg, Leif

AU - Grönholm, Markus

AU - Lappalainen, Petteri

AU - Rautiainen, Anssi

AU - Tamminen, Aleksi

AU - Luukanen, Arttu

PY - 2010

Y1 - 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.

U2 - 10.1364/AO.49.00E106

DO - 10.1364/AO.49.00E106

M3 - Article

SN - 1559-128X

VL - 49

SP - E106-E120

JO - Applied Optics

JF - Applied Optics

IS - 19

ER -

Passive terahertz camera for standoff security screening

Abstract

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