ABSTRACT
Fibers have spherical sections in most cases. In some cases, the surface may be treated and have a double layer structure. A cloth woven with glass fiber is usually used to reinforce plastic board such as that used for printed circuit boards, and the surface of the glass fiber is treated with reagents called “silane coupling reagent” in order to increase its affinity to plastics. Fibers are manufactured by extrusion from spinnerets. Since the human body perspires, the surface of polyurethane fiber is treated with chemicals to prevent degradation of the fiber. Transmission spectra of fibers contain light components such as stray light, radiation reflected by the surface, and radiation transmitted through the fiber with different pass lengths. The Lambert-Beer law will not hold for fiber and woven cloth samples, their spectra being different from common transmission spectra measured from samples of uniform thickness and no stray light.
