Title :
Spectroscopic analysis of powders through diffuse-reflectance imaging using a frequency-switchable terahertz quantum cascade laser
Author :
Valavanis, A. ; Dean, P. ; Chowdhury, Shuvro ; Burnett, A.D. ; Khanna, Suraj P. ; Davies, A. Giles ; Linfield, Edmund H.
Author_Institution :
Sch. of Electron. & Electr. Eng., Univ. of Leeds, Leeds, UK
Abstract :
A heterogeneous THz-QCL is used for diffuse-reflectance imaging of powdered solids at 4 frequencies in the range 3.05-3.35 THz. An effective-optical-path-length model reproduces TDS absorption spectra accurately and discriminates between admixtures of materials with differing concentrations.
Keywords :
powders; quantum cascade lasers; visible spectroscopy; absorption spectra; diffuse-reflectance imaging; effective-optical-path-length model; frequency 3.05 THz to 3.35 THz; frequency-switchable terahertz quantum cascade laser; powdered solids; powders spectroscopic analysis; Absorption; Imaging; Materials; Powders; Quantum cascade lasers; Reflectivity; Sugar;
Conference_Titel :
Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 2013 38th International Conference on
Conference_Location :
Mainz
DOI :
10.1109/IRMMW-THz.2013.6665598
