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THz spectra of drawn and undrawn fibers measured on fiber shape samples

机译：在纤维形状样品上测量的拉伸和未拉伸纤维的谱系

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摘要

This paper describes how to measure THz spectrum of a filament shape sample without freeze-crushing chemical fiber. The filament yarn was installed in parallel on a stainless-steel O-ring. The fiber axis direction of this O-ring was installed in parallel to THz polarization direction. THz spectrum measured by this pre-treatment method was measured at a high S/N ratio than THz spectrum of the freeze-crushing sample. Next, THz spectra of drawn and undrawn fibers, which were confirmed to have different internal structure of the fibers by wide-angle X-ray images, were measured. THz spectra of these samples were measured with different yarn spacings and at different angles (at regular angle intervals of 30 degrees) between the polarization direction of THz light and the fiber axis direction. When the fiber molecules were oriented along the axis by the drawing process, THz spectrum shape changed with the polarization angle, but it did not when the fiber orientations were random. This pre-treatment method avoids freeze-crushing, so the raw molecular structure inside the fiber was not altered thermally or mechanically and could be measured directly.
机译：本文介绍了如何测量灯丝形状样品的THz光谱，而无需冷冻碎解化学纤维。长丝纱线在不锈钢O形环上并联安装。该O形环的纤维轴方向与THz偏振方向平行安装。通过该预处理方法测量的THz光谱以高S / N比比冻碎样品的谱测量。接下来，测量通过广角X射线图像确认绘制和未拉伸纤维的绘制纤维的THz光谱，其通过广角X射线图像具有不同的纤维的内部结构。这些样品的THz光谱用不同的纱线间距测量，并且在THz光的偏振方向和纤维轴方向的偏振方向之间以不同的角度（在30度的常规角度间隔）。当通过拉伸过程沿轴线沿轴线定向纤维分子时，THz频谱形状随偏振角改变，但是当纤维取向是随机的时，它没有。该预处理方法避免了冷冻破碎，因此纤维内的原料分子结构未热或机械地改变，并且可以直接测量。

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