Comparing spectra from Time domain spectrometers and a polarizing Fourier transform spectrometer

We have performed a large set of spectroscopic measurements on a set of material samples and metal mesh grids with a THz Fourier transform spectrometer and two THz Time domain spectrometers. We used the statistical nature of the measurements from their repeatability and compared the results for the two different spectroscopic techniques. We find that the two systems are roughly equivalent with functional differences related to the frequencies of operation.