| Author(s): |
Erich N. Grossman; Charles Dietlein; |
| Title: |
Passive terahertz camera for standoff security screening |
| Published: |
July 01, 2010 |
| 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 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. |
| Citation: |
Applied Optics |
| Volume: |
49 |
| Issue: |
19 |
| Pages: |
pp. 106 - 120 |
| Keywords: |
terahertz;millimeter-wave;camera;imaging;superconducting;focal-plane array |
| Research Areas: |
Nanotechnology, Optoelectronics |
| PDF version: |
 Click here to retrieve PDF version of paper (2MB) |
