We propose a numerical parameter fitting method to determine the time delay between two temporally overlapped echo pulses in terahertz (THz) tomography measurements. The method is based on multiple-regression analysis with the least-squares method and is applied to decrease the minimum paint film thickness for THz paint meters. Applying multiple-regression analysis to paint thickness measurements is five times more sensitive with regard to the minimum thickness than numerical Fourier deconvolution. We apply the proposed method to determine the optical thickness, geometrical thickness, and group refractive index of dry paint film and wet paint film. The proposed method is useful for decreasing the minimum thickness for a THz paint meter and other THz tomography measurements.
© 2007 Optical Society of America
Original Manuscript: April 18, 2007
Revised Manuscript: July 22, 2007
Manuscript Accepted: July 23, 2007
Published: October 18, 2007
Takashi Yasuda, Tetsuo Iwata, Tsutomu Araki, and Takeshi Yasui, "Improvement of minimum paint film thickness for THz paint meters by multiple-regression analysis," Appl. Opt. 46, 7518-7526 (2007)