Terahertz Digital Holographic Imaging of Voids Within Visibly Opaque Dielectrics

Autor:	Michael E. Gehm, Dathon Golish, Wei-Ren Ng, Martin S. Heimbeck, Henry O. Everitt
Rok vydání:	2015
Předmět:	Heterodyne Radiation Materials science Opacity business.industry Terahertz radiation Holography law.invention Optics law Optical transfer function Optoelectronics Electrical and Electronic Engineering business Raster scan Image resolution Digital holography
Zdroj:	IEEE Transactions on Terahertz Science and Technology. 5:110-116
ISSN:	2156-3446 2156-342X
DOI:	10.1109/tthz.2014.2364511
Popis:	Terahertz digital off-axis holography (THzDH) has been demonstrated as a non-destructive tool for imaging voids within visually opaque dielectrics. Using a raster scanning heterodyne detector, the imager captures lensless transmission holograms formed by the interaction of a highly coherent, monochromatic beam with 3-D printed structures. Digital hologram reconstructions from two structures were used to measure the imager's modulation transfer function and to show that terahertz digital holography can provide sub-millimeter resolution images of voids within visually opaque printed structures. As a demonstration we imaged embedded air- and lossy dielectric filled-voids whose refractive indices differ from the host material.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2807ed9a66fed7b9ce10d52c291ef640 https://doi.org/10.1109/tthz.2014.2364511 Zobrazit plný text záznamu