15 April 2008 Terahertz imaging of concealed objects by acoustic phase detection
Author Affiliations +
We present a novel technique for detecting objects that are concealed by textiles. Items of virtually all materials can be sensed, which includes metals as well as dielectrics. Our technique detects the acoustic phase lag of objects when they follow a driven oscillation. The acoustic phase is measured interferometrically with continuous wave radiation at about 77 GHz. Typical oscillation amplitudes are about 1 μm, which is close to the human perception level. The technique provides no insight into the concealed item's material properties. It exclusively shows whether or not an object is hidden, which is the most relevant information for many sensing applications.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Federico Buersgens, Federico Buersgens, Guillermo Acuna, Guillermo Acuna, Roland Kersting, Roland Kersting, } "Terahertz imaging of concealed objects by acoustic phase detection", Proc. SPIE 6949, Terahertz for Military and Security Applications VI, 694905 (15 April 2008); doi: 10.1117/12.776862; https://doi.org/10.1117/12.776862


Fringe pattern analysis toolbox
Proceedings of SPIE (September 21 1995)
Phase-Locked Interferometry
Proceedings of SPIE (November 20 1977)
Ultrasound lock-in thermography: feasibilities and limitations
Proceedings of SPIE (September 09 1999)

Back to Top