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Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - A simple transfer-function-based approach for estimating material parameters from terahertz time-domain data
AU - Tych, Katarzyna
AU - Wood, Christopher
AU - Tych, Wlodek
PY - 2014/2
Y1 - 2014/2
N2 - A novel parametrically efficient approach to estimating the spectra of short transient signals is proposed and evaluated, with an application to estimating material properties, including complex refractive index and absorption coefficient, in the terahertz (THz) frequency range. This technique includes uncertainty analysis of the obtained spectral estimates, allowing rigorous statistical comparison between samples. In the proposed approach, a simple, few-parameter continuous-time transfer function model explains over 99.9% of the measured signal. The problem, normally solved using poorly numerically defined Fourier transform deconvolution methods, is reformulated and cast as a time-domain dynamic-system estimation problem, thus providing a true time-domain spectroscopy tool.
AB - A novel parametrically efficient approach to estimating the spectra of short transient signals is proposed and evaluated, with an application to estimating material properties, including complex refractive index and absorption coefficient, in the terahertz (THz) frequency range. This technique includes uncertainty analysis of the obtained spectral estimates, allowing rigorous statistical comparison between samples. In the proposed approach, a simple, few-parameter continuous-time transfer function model explains over 99.9% of the measured signal. The problem, normally solved using poorly numerically defined Fourier transform deconvolution methods, is reformulated and cast as a time-domain dynamic-system estimation problem, thus providing a true time-domain spectroscopy tool.
KW - Spectrum estimation
KW - transient signal
KW - parametric spectra
KW - spectroscopy
U2 - 10.1109/JPHOT.2013.2292337
DO - 10.1109/JPHOT.2013.2292337
M3 - Journal article
VL - 6
JO - IEEE Photonics Journal
JF - IEEE Photonics Journal
SN - 1943-0655
IS - 1
M1 - 6800211
ER -