Radiometric measurements of dielectric material properties at MMW frequencies for security applications

Markus Peichl; Stephan Dill; Helmut Suess

doi:10.1117/12.666540

5 May 2006 Radiometric measurements of dielectric material properties at MMW frequencies for security applications

Markus Peichl, Stephan Dill, Helmut Suess

Proceedings Volume 6211, Passive Millimeter-Wave Imaging Technology IX; 62110F (2006) https://doi.org/10.1117/12.666540
Event: Defense and Security Symposium, 2006, Orlando (Kissimmee), Florida, United States

Abstract

Microwaves can be used to detect hidden objects behind optically opaque materials. Hence, the penetration capability through such materials is of fundamental importance. In order to characterise a material of interest in the microwave region, its permittivity should be known besides its physical structure. In many cases the permittivity is unknown, inaccurately known, or known for only specific frequencies. Also very often the range of values given in the literature can have a large variability for a specific situation. In this paper we describe a procedure to determine the permittivity from radiometric free-space measurements of nearly arbitrary materials. The advantage of this method is that large material samples like brick or wooden plates, and materials like textiles, which are hard to mount in a defined way in a waveguide, can be investigated. Some representative results for MMW measurements are shown, and an estimation of the presently achieved precision is given. The first attempts showed a satisfying performance, although not for all materials and frequencies a unique solution could be found.

Citation Download Citation

Markus Peichl, Stephan Dill, and Helmut Suess "Radiometric measurements of dielectric material properties at MMW frequencies for security applications", Proc. SPIE 6211, Passive Millimeter-Wave Imaging Technology IX, 62110F (5 May 2006); https://doi.org/10.1117/12.666540

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available