Accession Number : ADA184538
Title : Precise Measurement of Refractive Index and Absorption Coefficient of Near Millimeter Wave and Far Infrared Materials.
Descriptive Note : Final rept. 1 Feb 84-31 Jan 87,
Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE FRANCIS BITTER NATIONAL MAGNET LAB
Personal Author(s) : Afsar,Mohammed N ; Button,Kenneth J
Report Date : Jun 1987
Pagination or Media Count : 9
Abstract : A quasi-optical technique, namely, dispersive Fourier transform spectrometry, has now been improved to provide high-precision continuous data of complex refractive index, complex dielectric permittivity and loss tangent of materials and complex magnetic permeability of ferrite materials at millimeter and submillimeter wavelengths. The use of a polarizing two beam interferometric technique allowed a broad frequency coverage in particularly between 6mm and 0.5mm range. Non-polar polymers such as polyethylene and teflon exhibit extremely low-loss characteristics in the entire millimeter wavelength range.
Descriptors : *REFRACTIVE INDEX , *FAR INFRARED RADIATION , *DIELECTRIC PROPERTIES , *MICROWAVES , SPECTROMETERS , FOURIER TRANSFORMATION , PERMEABILITY(MAGNETIC) , POLYMERS , SAPPHIRE , WINDOWS , RADOMES , SUBSTRATES , BIREFRINGENCE
Subject Categories : Optics
Electricity and Magnetism
Distribution Statement : APPROVED FOR PUBLIC RELEASE