Identification of cellulosic fiber by terahertz spectroscopy

Absorption spectra of constituents of fibers are distinguishable by THz spectroscopy, even for fibers in the same category or species. The advantage of this technique is its sensitivity to the structural differences of the fibers, even if they consist largely of the same components. The THz spectra of cellulosic fibers in the category of plant-derived fibers and regenerated cellulose fibers showed an identifiable character, as an example.