Passive terahertz camera for standoff security screening

被引：112

作者：

Grossman, Erich ^{[1
]}

Dietlein, Charles ^{[1
]}

Ala-Laurinaho, Juha ^{[3
]}

Leivo, Mikko

Gronberg, Leif

Gronholm, Markus

Lappalainen, Petteri ^{[2
]}

Rautiainen, Anssi

Tamminen, Aleksi ^{[3
]}

Luukanen, Arttu ^{[2
]}

机构：

[1] Natl Inst Stand & Technol, Div Optoelect, Boulder, CO 80305 USA

[2] VTT Tech Res Ctr Finland, Millimetrewave Lab Finland Millilab, Espoo, Finland

[3] Aalto Univ, Millimetrewave Lab Finland Millilab, Espoo, Finland

来源：

APPLIED OPTICS | 2010年 / 49卷 / 19期

关键词：

ELECTROTHERMAL FEEDBACK; NOISE; MICROBOLOMETER; BOLOMETERS;

D O I：

10.1364/AO.49.00E106

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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

引用

页码：E106 / E120

页数：15

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