Title :
Free space quasi-optical instrumentation for dielectric measurements of highly scattering materials in millimeter waves
Author :
Zijing Li ; Ayala, Ana ; Afsar, Mohammed N. ; Korolev, Konstantin A
Author_Institution :
Dept. of Electr. & Comput. Eng., Tufts Univ., Medford, MA, USA
Abstract :
Complex dielectric permittivity of dyed corn meal has been studied over a wide range of frequency, from 70 to 120 GHz. Transmittance and reflectance spectra have been recorded by using a free space quasi-optical millimeter-wave spectrometer, equipped with a high-power backward-wave oscillator as the source of tunable coherent radiation. The complex permittivity of dyed corn meal has been calculated by using analysis of recorded high-precision reflectance and transmittance spectra. The density dependence of complex dielectric permittivity of dyed corn meal has been studied.
Keywords :
backward wave oscillators; food processing industry; food products; millimetre wave measurement; millimetre wave spectra; permittivity measurement; complex dielectric permittivity measurement; dyed corn meal; free space quasioptical millimeter-wave spectrometer; frequency 70 GHz to 120 GHz; high-power backward-wave oscillator; highly scattering materials; reflectance spectra; transmittance spectra; tunable coherent radiation; Dielectric materials; Dielectric measurements; Extraterrestrial measurements; Frequency; Instruments; Millimeter wave measurements; Permittivity; Reflectivity; Scattering; Spectroscopy; Backward-wave oscillator; dielectric permittivity; highly scattering materials; millimeter-wave measurements;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 2009. I2MTC '09. IEEE
Conference_Location :
Singapore
Print_ISBN :
978-1-4244-3352-0
DOI :
10.1109/IMTC.2009.5168522
