Title :
Terahertz time-domain spectroscopy of crushed wheat grain
Author :
Chua, Hong S. ; Obradovic, Jelena ; Haigh, Arthur D. ; Upadhya, Prashanth C. ; Hirsch, Ole ; Crawley, David ; Gibson, Andrew A P ; Gladden, Lynn F. ; Linfield, Edmund H.
Author_Institution :
Sch. of Electr. & Electron. Eng., Manchester Univ., UK
Abstract :
The terahertz time-domain spectroscopy (THz-TDS) is used to measure absorption spectra in crushed wheat grain over the frequency range of 0.1-2.0 THz. A number of well resolved absorption peaks are observed for dry, 12%, 14% and 18% moisture content levels. Subtracting the transmission signal spectra of the dry flour from that of the wetted flour provides a calibrated result which relates attenuation to moisture content level.
Keywords :
agricultural products; moisture; spectra; submillimetre wave measurement; submillimetre wave spectroscopy; 0.1 to 2 THz; THz spectroscopy; absorption peaks; absorption spectra measurement; crushed wheat grains; moisture content levels; terahertz time-domain spectroscopy; transmission signal spectra; Absorption; Laser excitation; Moisture measurement; Optical beams; Optical pulse generation; Permittivity measurement; Spectroscopy; Structural beams; Submillimeter wave measurements; Time domain analysis;
Conference_Titel :
Microwave Symposium Digest, 2005 IEEE MTT-S International
Print_ISBN :
0-7803-8845-3
DOI :
10.1109/MWSYM.2005.1517162
