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

PDF Url : ADA184538

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
      Miscellaneous Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE