Millimeter and Submillimeter Wave Dielectric Measurements of Household Powders Using Fourier Transform Spectroscopy

High resolution millimeter and submillimeter wave measurements of solids and powders are very difficult to acquire and have taken on a growing significance for security reasons. Utilizing a two-beam polarizing interferometer, the dielectric properties of household powders were obtained through Dispersive Fourier Transform Spectroscopy. The refractive index, absorption coefficient, real and imaginary permittivity, and loss tangent for talc, confectioner sugar, flour, baking soda, and dry milk from 400 GHz to 1.2 THz are presented in this paper