Open AccessAdaptive terahertz imaging using a virtual transceiver and coherence weighting
Author(s) -
Zhuopeng Zhang,
Takashi Buma
Publication year - 2009
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.017812
Subject(s) - optics , image resolution , computer science , coherence (philosophical gambling strategy) , terahertz radiation , transceiver , depth of field , image quality , spatial frequency , aperture (computer memory) , computer vision , physics , telecommunications , acoustics , image (mathematics) , quantum mechanics , wireless
We demonstrate an adaptive reconstruction technique to significantly improve the depth of focus and contrast of three-dimensional reflection-mode terahertz imaging. A laterally scanned virtual transceiver element records reflections from the object of interest. A synthetic aperture focusing technique maintains fine spatial resolution over a large image depth. Measuring the spatial coherence of the received signals across the transceiver aperture provides a non-iterative self-adaptive approach to significantly improve image contrast. Test images show a spatial resolution of 0.4 mm maintained over a 16 mm depth of field, and up to a 30 dB improvement in signal-to-noise ratio.